Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2018	Oct. 24, 2018
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Trading Symbol	MAR
Entity Registrant Name	MARRIOTT INTERNATIONAL INC /MD/
Entity Central Index Key	0001048286
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		341,130,300

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
REVENUES
Revenues	$ 5,049	$ 5,078	$ 15,401	$ 15,201
OPERATING COSTS AND EXPENSES
Depreciation, amortization, and other	52	54	164	176
General, administrative, and other	221	205	685	651
Merger-related costs and charges	12	28	64	100
Costs and expenses	4,479	4,288	13,591	13,121
OPERATING INCOME	570	790	1,810	2,080
Gains and other income, net	18	6	191	31
Interest expense	(86)	(73)	(246)	(216)
Interest income	5	9	16	24
Equity in earnings	61	6	95	29
INCOME BEFORE INCOME TAXES	568	738	1,866	1,948
Provision for income taxes	(85)	(253)	(375)	(603)
NET INCOME	$ 483	$ 485	$ 1,491	$ 1,345
EARNINGS PER SHARE
Earnings per share - basic (in USD per share)	$ 1.39	$ 1.30	$ 4.23	$ 3.55
Earnings per share - diluted (in USD per share)	1.38	1.29	4.18	3.51
CASH DIVIDENDS DECLARED PER SHARE (in USD per share)	$ 0.41	$ 0.33	$ 1.15	$ 0.96
Base management fees
REVENUES
Gross revenues	$ 279	$ 269	$ 852	$ 818
Franchise fees
REVENUES
Gross revenues	502	419	1,394	1,182
Incentive management fees
REVENUES
Gross revenues	151	138	482	433
Fee revenues
REVENUES
Gross revenues	932	826	2,728	2,433
Contract investment amortization	(13)	(11)	(44)	(34)
Revenues	919	815	2,684	2,399
Owned, leased, and other
REVENUES
Revenues	397	433	1,226	1,309
OPERATING COSTS AND EXPENSES
Operating costs	315	351	985	1,057
Reimbursements
REVENUES
Revenues	3,733	3,830	11,491	11,493
OPERATING COSTS AND EXPENSES
Operating costs	$ 3,879	$ 3,650	$ 11,693	$ 11,137

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 483	$ 485	$ 1,491	$ 1,345
Other comprehensive (loss) income:
Foreign currency translation adjustments	(66)	107	(313)	457
Derivative instrument adjustments, net of tax	(1)	(5)	7	(13)
Unrealized gain (loss) on available-for-sale securities, net of tax	0	1	0	(1)
Pension and postretirement adjustments, net of tax	0	0	0	0
Reclassification of losses, net of tax	2	4	18	5
Net other comprehensive (loss) income	(65)	107	(288)	448
Comprehensive income	$ 418	$ 592	$ 1,203	$ 1,793

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current assets
Cash and equivalents	$ 373	$ 383
Accounts and notes receivable, net	2,175	1,973
Prepaid expenses and other	242	235
Assets held for sale	13	149
Assets, current, total	2,803	2,740
Property and equipment, net	1,967	1,793
Intangible assets
Goodwill	9,067	9,207
Goodwill and intangible assets, net, total	17,470	17,751
Equity method investments	689	734
Notes receivable, net	122	142
Deferred tax assets	171	93
Other noncurrent assets	611	593
Total assets	23,833	23,846
Current liabilities
Current portion of long-term debt	617	398
Accounts payable	759	783
Accrued payroll and benefits	1,253	1,214
Accrued expenses and other	1,117	1,291
Liabilities, current, total	6,051	5,807
Long-term debt	8,710	7,840
Deferred tax liabilities	551	605
Other noncurrent liabilities	2,248	2,610
Shareholders’ equity
Class A Common Stock	5	5
Additional paid-in-capital	5,773	5,770
Retained earnings	8,705	7,242
Treasury stock, at cost	(11,850)	(9,418)
Accumulated other comprehensive loss	(309)	(17)
Stockholders' equity (deficit) attributable to parent	2,324	3,582
Liabilities and equity (deficit), total	23,833	23,846
Brands
Intangible assets
Intangible assets	5,809	5,922
Contract acquisition costs and other
Intangible assets
Intangible assets	2,594	2,622
Liability for guest loyalty program
Current liabilities
Liability for guest loyalty program	2,305	2,121
Contract with customer	3,317	2,819
Deferred revenue
Current liabilities
Contract with customer	$ 632	$ 583

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
OPERATING ACTIVITIES
Net income	$ 1,491	$ 1,345
Adjustments to reconcile to cash provided by operating activities:
Depreciation, amortization, and other	208	210
Share-based compensation	140	139
Income taxes	(192)	190
Contract acquisition costs	(110)	(126)
Merger-related charges	(37)	(117)
Working capital changes	(233)	(124)
Gain on asset dispositions	(191)	(30)
Other	67	108
Net cash provided by (used in) operating activities	1,824	1,751
INVESTING ACTIVITIES
Capital expenditures	(462)	(155)
Dispositions	460	482
Loan advances	(13)	(85)
Loan collections	47	91
Other	49	(6)
Net cash provided by investing activities	81	327
FINANCING ACTIVITIES
Commercial paper/Credit Facility, net	1,045	480
Issuance of long-term debt	443	1
Repayment of long-term debt	(391)	(305)
Issuance of Class A Common Stock	4	4
Dividends paid	(404)	(362)
Purchase of treasury stock	(2,513)	(2,105)
Share-based compensation withholding taxes	(105)	(144)
Net cash provided by (used in) financing activities	(1,921)	(2,431)
DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	(16)	(353)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period	429	887
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period	413	534
Liability for guest loyalty program
Adjustments to reconcile to cash provided by operating activities:
Liability for guest loyalty program	$ 681	$ 156

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Statement of Cash Flows [Abstract]
Restricted Cash	$ 40	$ 46

Basis of Presentation

9 Months Ended

Sep. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

BASIS OF PRESENTATION

The condensed consolidated financial statements present the results of operations, financial position, and cash flows of Marriott International, Inc. and subsidiaries (referred to in this report as “we,” “us,” “Marriott,” or “the Company”). In order to make this report easier to read, we also refer throughout to (i) our Condensed Consolidated Financial Statements as our “Financial Statements,” (ii) our Condensed Consolidated Statements of Income as our “Income Statements,” (iii) our Condensed Consolidated Balance Sheets as our “Balance Sheets,” (iv) our Condensed Consolidated Statements of Cash Flows as our “Statements of Cash Flows,” (v) our properties, brands, or markets in the United States (“U.S.”) and Canada as “North America” or “North American,” and (vi) our properties, brands, or markets in our Caribbean and Latin America, Europe, and Middle East and Africa regions as “Other International,” and together with those in our Asia Pacific segment, as “International.” In addition, references throughout to numbered “Footnotes” refer to the numbered Notes in these Notes to Condensed Consolidated Financial Statements, unless otherwise noted.

These Financial Statements have not been audited. We have condensed or omitted certain information and footnote disclosures normally included in financial statements presented in accordance with U.S. generally accepted accounting principles (“GAAP”). The financial statements in this report should be read in conjunction with the consolidated financial statements and notes thereto in our Annual Report on Form 10-K for the fiscal year ended December 31, 2017 (“2017 Form 10-K”). Certain terms not otherwise defined in this Form 10-Q have the meanings specified in our 2017 Form 10-K.

Preparation of financial statements that conform with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the financial statements, the reported amounts of revenues and expenses during the reporting periods, and the disclosures of contingent liabilities. Accordingly, ultimate results could differ from those estimates.

The accompanying Financial Statements reflect all normal and recurring adjustments necessary to present fairly our financial position as of September 30, 2018 and December 31, 2017, the results of our operations for the three and nine months ended September 30, 2018 and September 30, 2017, and cash flows for the nine months ended September 30, 2018 and September 30, 2017. Interim results may not be indicative of fiscal year performance because of seasonal and short-term variations. We have eliminated all material intercompany transactions and balances between entities consolidated in these Financial Statements.

The accompanying Financial Statements also reflect our adoption of several new accounting standards. See the “New Accounting Standards Adopted” caption below for additional information.

New Accounting Standards Not Yet Adopted

Accounting Standards Update (“ASU”) 2016-02 “Leases” (Topic 842). ASU 2016-02 introduces a lessee model that brings substantially all leases onto the balance sheet. Under the new standard, a lessee will recognize on its balance sheet a lease liability and a right-of-use asset for most leases, including operating leases. The new standard will also distinguish leases as either finance leases or operating leases. This distinction will affect how leases are measured and presented in the income statement and statement of cash flows. We will adopt the standard using the modified retrospective transition method as of January 1, 2019, and we will not apply the standard to the comparative periods presented in the year of adoption.

We are still assessing the potential impact that ASU 2016-02 will have on our financial statements and disclosures, but we expect that we will recognize right-of-use lease assets and related lease liabilities for operating leases in the range of $1.0 billion to $1.2 billion, with no impact to our Income Statements or Statements of Cash Flows. Our estimate represents the net present value of lease payments from leases that we had entered into as of September 30, 2018, and that are scheduled to commence by January 1, 2019. The actual impact may differ from our estimate depending on our lease portfolio and discount rates on the adoption date. We do not expect any changes related to our current capital lease portfolio, which will be titled “finance leases” under ASU 2016-02.

New Accounting Standards Adopted

ASU 2016-18 “Restricted Cash” (Topic 230). ASU 2016-18 requires companies to include restricted cash with cash and cash equivalents when reconciling beginning and ending amounts shown on the statement of cash flows. We adopted ASU 2016-18 in the 2018 first quarter using the retrospective transition method, and accordingly, we revised prior period amounts, as shown in the “Statements of Cash Flows” table below.

ASU 2016-16 “Accounting for Income Taxes: Intra-Entity Transfers of Assets Other than Inventory” (Topic 740). ASU 2016-16 requires companies to recognize the income tax effects of intercompany sales of assets other than inventory when the transfer occurs. We adopted ASU 2016-16 in the 2018 first quarter using the modified retrospective transition method and recorded an adjustment of $372 million for the cumulative effect to retained earnings at January 1, 2018.

ASU 2016-15 “Classification of Certain Cash Receipts and Cash Payments” (Topic 230). ASU 2016-15 specifies how certain cash receipts and payments are to be classified in the statement of cash flows and primarily impacts our presentation of cash outflows for commercial paper. Under ASU 2016-15, we are required to attribute a portion of the payments to accreted interest and classify that portion as cash outflows for operating activities. We adopted ASU 2016-15 in the 2018 first quarter using the retrospective transition method, and accordingly, we revised prior period amounts, as shown in the “Statements of Cash Flows” table below.

ASU 2016-01 “Recognition and Measurement of Financial Assets and Financial Liabilities” (Topic 825). ASU 2016-01 eliminates the available-for-sale classification for equity investments and requires companies to measure equity investments at fair value and recognize any changes in the fair value in net income. We adopted ASU 2016-01 in the 2018 first quarter using the modified retrospective transition method and recorded a cumulative-effect adjustment of $4 million to retained earnings at January 1, 2018.

ASU 2014-09 “Revenue from Contracts with Customers” (Topic 606). ASU 2014-09 and several related ASUs (collectively referred to as “ASU 2014-09”) supersede the revenue recognition requirements in Topic 605, Revenue Recognition, as well as most industry-specific guidance, and provide a principles-based, comprehensive framework in Topic 606, Revenue Recognition. ASU 2014-09 also specifies the accounting for certain costs to obtain or fulfill a contract with a customer and provides enhanced disclosure requirements. We adopted ASU 2014-09 in the 2018 first quarter using the full retrospective transition method. See Footnote 2. Revenues for disclosures required by ASU 2014-09, including our revenue recognition accounting policies.

When we adopted ASU 2014-09, we applied the following expedients and exemptions, which are allowed by the standard, to our prior period Financial Statements and disclosures:


•	We used the transaction price at the date of contract completion for our contracts that had variable consideration and were completed before January 1, 2018.


•	We considered the aggregate effect of all contract modifications that occurred before January 1, 2016 when: (1) identifying satisfied and unsatisfied performance obligations; (2) determining the transaction price; and (3) allocating the transaction price to the satisfied and unsatisfied performance obligations.


•	We did not: (1) disclose the amount of the transaction price that we allocated to remaining performance obligations; or (2) include an explanation of when we expect to recognize the revenue allocated to remaining performance obligations.

The cumulative effect of adopting ASU 2014-09 was a decrease in 2016 retained earnings of $264 million.

The following tables present the effect of the adoption of ASUs 2014-09, 2016-15, and 2016-18 on our 2017 Financial Statements. Throughout this report, our 2017 financial results reflect the “As Adjusted” amounts shown in the tables below.

Income Statements



	Three Months Ended									Nine Months Ended
($ in millions, except per share amounts)	September 30, 2017 (As Previously Reported)			Adoption of ASU 2014-09			September 30, 2017 (As Adjusted)			September 30, 2017 (As Previously Reported)			Adoption of ASU 2014-09			September 30, 2017 (As Adjusted)
REVENUES
Base management fees	$	269		$	—		$	269		$	818		$	—		$	818
Franchise fees	426			(7		)	419			1,207			(25		)	1,182
Incentive management fees	136			2			138			437			(4		)	433
Gross fee revenues	831			(5		)	826			2,462			(29		)	2,433
Contract investment amortization	—			(11		)	(11		)	—			(34		)	(34		)
Net fee revenues	831			(16		)	815			2,462			(63		)	2,399
Owned, leased, and other revenue	452			(19		)	433			1,349			(40		)	1,309
Cost reimbursement revenue	4,380			(550		)	3,830			13,208			(1,715		)	11,493
	5,663			(585		)	5,078			17,019			(1,818		)	15,201
OPERATING COSTS AND EXPENSES
Owned, leased, and other-direct	356			(5		)	351			1,069			(12		)	1,057
Depreciation, amortization, and other	68			(14		)	54			218			(42		)	176
General, administrative, and other	199			6			205			635			16			651
Merger-related costs and charges	28			—			28			100			—			100
Reimbursed expenses	4,380			(730		)	3,650			13,208			(2,071		)	11,137
	5,031			(743		)	4,288			15,230			(2,109		)	13,121
OPERATING INCOME	632			158			790			1,789			291			2,080
Gains and other income, net	6			—			6			31			—			31
Interest expense	(73		)	—			(73		)	(216		)	—			(216		)
Interest income	9			—			9			24			—			24
Equity in earnings	6			—			6			29			—			29
INCOME BEFORE INCOME TAXES	580			158			738			1,657			291			1,948
Provision for income taxes	(188		)	(65		)	(253		)	(486		)	(117		)	(603		)
NET INCOME	$	392		$	93		$	485		$	1,171		$	174		$	1,345
EARNINGS PER SHARE
Earnings per share - basic	$	1.05		$	0.25		$	1.30		$	3.09		$	0.46		$	3.55
Earnings per share - diluted	$	1.04		$	0.25		$	1.29		$	3.06		$	0.45		$	3.51

Statements of Comprehensive Income



	Three Months Ended								Nine Months Ended
($ in millions)	September 30, 2017 (As Previously Reported)			Adoption of ASU 2014-09		September 30, 2017 (As Adjusted)			September 30, 2017 (As Previously Reported)			Adoption of ASU 2014-09		September 30, 2017 (As Adjusted)
Net income	$	392		$	93	$	485		$	1,171		$	174	$	1,345
Other comprehensive income:
Foreign currency translation adjustments	107			—		107			457			—		457
Derivative instrument adjustments, net of tax	(5		)	—		(5		)	(13		)	—		(13		)
Unrealized gain (loss) on available-for-sale securities, net of tax	1			—		1			(1		)	—		(1		)
Pension and postretirement adjustments, net of tax	—			—		—			—			—		—
Reclassification of losses, net of tax	4			—		4			5			—		5
Total other comprehensive income, net of tax	107			—		107			448			—		448
Comprehensive income	$	499		$	93	$	592		$	1,619		$	174	$	1,793

Balance Sheets



($ in millions)	December 31, 2017 (As Previously Reported) ⁽¹⁾			Adoption of ASU 2014-09			December 31, 2017 (As Adjusted)
ASSETS
Current assets
Cash and equivalents	$	383		$	—		$	383
Accounts and notes receivable, net	1,999			(26		)	1,973
Prepaid expenses and other	216			19			235
Assets held for sale	149			—			149
	2,747			(7		)	2,740
Property and equipment, net	1,793			—			1,793
Intangible assets
Brands	5,922			—			5,922
Contract acquisition costs and other	2,884			(262		)	2,622
Goodwill	9,207			—			9,207
	18,013			(262		)	17,751
Equity method investments	735			(1		)	734
Notes receivable, net	142			—			142
Deferred tax assets	93			—			93
Other noncurrent assets	426			167			593
	$	23,949		$	(103	)	$	23,846
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities
Current portion of long-term debt	$	398		$	—		$	398
Accounts payable	783			—			783
Accrued payroll and benefits	1,214			—			1,214
Liability for guest loyalty program	2,064			57			2,121
Accrued expenses and other	1,541			(250		)	1,291
	6,000			(193		)	5,807
Long-term debt	7,840			—			7,840
Liability for guest loyalty program	2,876			(57		)	2,819
Deferred tax liabilities	604			1			605
Deferred revenue	145			438			583
Other noncurrent liabilities	2,753			(143		)	2,610
Shareholders' equity
Class A Common Stock	5			—			5
Additional paid-in-capital	5,770			—			5,770
Retained earnings	7,391			(149		)	7,242
Treasury stock, at cost	(9,418		)	—			(9,418		)
Accumulated other comprehensive loss	(17		)	—			(17		)
	3,731			(149		)	3,582
	$	23,949		$	(103	)	$	23,846


⁽¹⁾	Includes reclassifications among various captions, including Deferred revenue and Other noncurrent liabilities, to conform to current period presentation.

Statements of Cash Flows



	Nine Months Ended									Nine Months Ended
($ in millions)	September 30, 2017 (As Previously Reported)			Adoption of ASU 2014-09			Adoption of ASUs 2016-18 and 2016-15			September 30, 2017 (As Adjusted)
OPERATING ACTIVITIES
Net income	$	1,171		$	174		$	—		$	1,345
Adjustments to reconcile to cash provided by operating activities:
Depreciation, amortization, and other	218			(8		)	—			210
Share-based compensation	139			—			—			139
Income taxes	73			117			—			190
Liability for guest loyalty program	236			(80		)	—			156
Contract acquisition costs	—			(126		)	—			(126		)
Merger-related charges	(117		)	—			—			(117		)
Working capital changes	98			(219		)	(3		)	(124		)
Gain on asset dispositions	(30		)	—			—			(30		)
Other	128			5			(25		)	108
Net cash provided by (used in) operating activities	1,916			(137		)	(28		)	1,751
INVESTING ACTIVITIES
Capital expenditures	(155		)	—			—			(155		)
Dispositions	482			—			—			482
Loan advances	(85		)	—			—			(85		)
Loan collections	91			—			—			91
Contract acquisition costs	(129		)	129			—			—
Other	(14		)	8			—			(6		)
Net cash provided by investing activities	190			137			—			327
FINANCING ACTIVITIES
Commercial paper/Credit Facility, net	455			—			25			480
Issuance of long-term debt	1			—			—			1
Repayment of long-term debt	(305		)	—			—			(305		)
Issuance of Class A Common Stock	4			—			—			4
Dividends paid	(362		)	—			—			(362		)
Purchase of treasury stock	(2,105		)	—			—			(2,105		)
Share-based compensation withholding taxes	(144		)	—			—			(144		)
Net cash (used in) provided by financing activities	(2,456		)	—			25			(2,431		)
(DECREASE) INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	(350		)	—			(3		)	(353		)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period	858			—			29			887
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period	$	508		$	—		$	26		$	534

See Footnote 10. Accumulated Other Comprehensive Loss and Shareholders’ Equity for the impact of the adoption of new accounting standards on our shareholders’ equity.

Revenues

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenues

REVENUES

Disaggregation of Revenues

The following tables present our revenues disaggregated by major revenue stream for the three and nine months ended September 30, 2018 and September 30, 2017.



	Three Months Ended September 30, 2018
($ in millions)	North American Full-Service			North American Limited-Service			Asia Pacific		Other International			Total
Gross fee revenues	$	305		$	246		$	119	$	135		$	805
Contract investment amortization	(7		)	(3		)	—		(3		)	(13		)
Net fee revenues	298			243			119		132			792
Owned, leased, and other revenue	137			34			46		165			382
Cost reimbursement revenue	2,688			598			110		264			3,660
Total segment revenue	$	3,123		$	875		$	275	$	561		$	4,834
Unallocated corporate												215
Total revenue												$	5,049



	Three Months Ended September 30, 2017
($ in millions)	North American Full-Service			North American Limited-Service			Asia Pacific		Other International			Total
Gross fee revenues	$	285		$	232		$	106	$	118		$	741
Contract investment amortization	(7		)	(2		)	—		(2		)	(11		)
Net fee revenues	278			230			106		116			730
Owned, leased, and other revenue	157			37			48		179			421
Cost reimbursement revenue	2,661			596			109		296			3,662
Total segment revenue	$	3,096		$	863		$	263	$	591		$	4,813
Unallocated corporate												265
Total revenue												$	5,078



	Nine Months Ended September 30, 2018
($ in millions)	North American Full-Service			North American Limited-Service			Asia Pacific			Other International			Total
Gross fee revenues	$	949		$	692		$	346		$	385		$	2,372
Contract investment amortization	(25		)	(9		)	(1		)	(9		)	(44		)
Net fee revenues	924			683			345			376			2,328
Owned, leased, and other revenue	432			104			141			501			1,178
Cost reimbursement revenue	8,422			1,737			332			818			11,309
Total segment revenue	$	9,778		$	2,524		$	818		$	1,695		$	14,815
Unallocated corporate													586
Total revenue													$	15,401



	Nine Months Ended September 30, 2017
($ in millions)	North American Full-Service			North American Limited-Service			Asia Pacific			Other International			Total
Gross fee revenues	$	891		$	643		$	301		$	349		$	2,184
Contract investment amortization	(19		)	(8		)	(1		)	(6		)	(34		)
Net fee revenues	872			635			300			343			2,150
Owned, leased, and other revenue	535			100			138			503			1,276
Cost reimbursement revenue	8,206			1,705			318			845			11,074
Total segment revenue	$	9,613		$	2,440		$	756		$	1,691		$	14,500
Unallocated corporate													701
Total revenue													$	15,201

Performance Obligations

For our managed hotels, we have performance obligations to provide hotel management services and a license to our hotel system intellectual property for the use of our brand names. As compensation for such services, we are generally entitled to receive base fees, which are a percentage of the revenues of hotels, and incentives fees, which are generally based on a measure of hotel profitability. Both the base and incentive management fees are variable consideration, as the transaction price is based on a percentage of revenue or profit, as defined in each contract. We recognize base management fees on a monthly basis over the term of the agreement as those amounts become payable. We recognize incentive management fees on a monthly basis over the term of the agreement based on each property's financial results, as long as we do not expect a significant reversal due to projected future hotel performance or cash flows in future periods.

For our franchised hotels, we have a performance obligation to provide franchisees and operators a license to our hotel system intellectual property for use of certain of our brand names. As compensation for such services, we are typically entitled to initial application fees and ongoing royalty fees. Our ongoing royalty fees represent variable consideration, as the transaction price is based on a percentage of certain revenues of the hotels, as defined in each contract. We recognize royalty fees on a monthly basis over the term of the agreement as those amounts become payable. Initial application and relicensing fees are fixed consideration payable upon submission of a franchise application or renewal and are recognized on a straight-line basis over the initial or renewal term of the franchise agreements.

Under our management and franchise agreements, we are entitled to be reimbursed for certain costs we incur on behalf of the managed, franchised, and licensed properties, with no added mark-up. These costs primarily consist of payroll and related expenses at managed properties where we are the employer of the employees at the properties, and include certain operational and administrative costs as provided for in our contracts with the owners. We are entitled to reimbursement in the period we incur the related reimbursable costs, which we recognize within the “Cost reimbursement revenue” caption of our Income Statements.

Under our management and franchise agreements, hotel owners and franchisees participate in certain centralized programs and services, such as marketing, sales, reservations, and insurance programs. We operate these programs and services for the benefit of our hotel owners. We do not operate these programs and services to generate a profit over the contract term, and accordingly, when we recover the costs that we incur for these programs and services from our hotel owners, we do not seek a mark-up. The amounts we charge for these programs and services are generally based on sales or other variable metrics and are payable on a monthly basis. We recognize revenue within the “Cost reimbursement revenue” caption of our Income Statements when the amounts may be billed to hotel owners, and we recognize expenses within the “Reimbursed expenses” caption as they are incurred. This pattern of recognition results in temporary timing differences between the costs incurred for centralized programs and services and the related reimbursement from hotel owners in our operating and net income. Over the long term, these programs and services are not designed to impact our economics, either positively or negatively. In addition, proceeds from the sale of our interest in Avendra that we expend for the benefit of our hotel owners are included in “Reimbursed expenses.”

We provide hotel design and construction review quality assurance (“Global Design”) services to our managed and franchised hotel owners, generally during the period prior to a hotel’s opening or during the period a hotel is converting to a Marriott brand (the “pre-opening period”). As compensation for such services, we may be entitled to receive a one-time fixed fee that is payable during the pre-opening period of the hotel. As these services are not a distinct performance obligation, we recognize the fees on a straight-line basis over the initial term of the management or franchise agreement within the “Owned, leased, and other revenue” caption of our Income Statements.

At our owned and leased hotels, we have performance obligations to provide accommodations and other ancillary services to hotel guests. As compensation for such goods and services, we are typically entitled to a fixed nightly fee for an agreed upon period and additional fixed fees for any ancillary services purchased. These fees are generally payable at the time the hotel guest checks out of the hotel. We generally satisfy the performance obligations over time, and we recognize the revenue from room sales and from other ancillary guest services on a daily basis, as the rooms are occupied and we have rendered the services.

Under our Loyalty Program, we have a performance obligation to provide or arrange for the provision of goods or services for free or at a discount to Loyalty Program members in exchange for the redemption of points earned from past activities. We operate our Loyalty Program as a cross-brand marketing program to participating properties. Our management and franchise agreements require that properties reimburse us for a portion of the costs of operating the Loyalty Program, including costs for marketing, promotion, communication with, and performing member services for Loyalty Program members, with no added mark-up. We receive contributions on a monthly basis from managed, franchised, owned, and leased hotels based on a portion of qualified spend by Loyalty Program members. We recognize these contributions into revenue as the points are redeemed and we provide the related service. The amount of revenue we recognize upon point redemption is impacted by our estimate of the “breakage” for points that members will never redeem. We estimate such amounts based on our historical experience and expectations of future member behavior. We recognize revenue net of the redemption cost within our “Cost reimbursement revenue” caption of our Income Statements, as our performance obligation is to facilitate the transaction between the Loyalty Program member and the managed or franchised property or program partner. We recognize all other Loyalty Program costs as incurred in our “Reimbursed expenses” caption.

We have multi-year agreements for our co-brand credit cards associated with our Loyalty Program. Under these agreements, we have performance obligations to provide a license to the intellectual property associated with our brands and marketing lists (“Licensed IP”) to the financial institutions that issue the credit cards, to arrange for the redemption of Loyalty Program points as discussed in the preceding paragraph, and to provide free night certificates to cardholders. We receive fees from these agreements, including fixed amounts that are primarily payable at contract inception, and variable amounts that are paid to us monthly over the term of the agreements, based on: (1) the number of free night certificates issued and redeemed; (2) the number of Loyalty Program points purchased; and (3) the volume of cardholder spend. We allocate those fees among the performance obligations, including the Licensed IP, our Loyalty Program points, and free night certificates provided to cardholders based on their estimated standalone selling prices. The estimation of the standalone selling prices requires significant judgments based upon generally accepted valuation methodologies regarding the value of our Licensed IP, the amount of funding we will receive, and the number of Loyalty Program points and free night certificates we will issue over the term of the agreements. We base our estimates of these amounts on our historical experience and expectation of future cardholder behavior. We recognize the portion of the Licensed IP revenue that meets the sales-based royalty criteria as the credit cards are used and the remaining portion of the Licensed IP revenue on a straight-line basis over the contract term. In our Income Statements, we primarily recognize Licensed IP revenue in the “Franchise fees” caption, and we recognize a portion in the “Cost reimbursement revenue” caption. We recognize the revenue related to the Loyalty Program points as discussed in the preceding paragraph. We recognize the revenue related to the free night certificates when the related service is provided. If the free night certificate redemption involves a managed or franchised property, we recognize revenue net of the redemption cost, as our performance obligation is to facilitate the transaction between the Loyalty Program member and the managed or franchised property.

Contract Balances

We generally receive payments from customers as we satisfy our performance obligations. We record a receivable when we have an unconditional right to receive payment and only the passage of time is required before payment is due. We record deferred revenue when we receive payment, or have the unconditional right to receive payment, in advance of the satisfaction of our performance obligations related to franchise application and relicensing fees, Global Design fees, credit card branding license fees, and our Loyalty Program.

Current and noncurrent deferred revenue increased by $81 million, to $766 million at September 30, 2018 from $685 million at December 31, 2017, primarily as a result of our application and relicensing and co-brand credit card activities described above in the “Performance Obligations” caption.

Our current and noncurrent Loyalty Program liability increased by $682 million, to $5,622 million at September 30, 2018 from $4,940 million at December 31, 2017, primarily reflecting an increase in points earned, partially offset by deferred revenue of $1,315 million that we recognized during the first three quarters of 2018.

Costs incurred to obtain and fulfill contracts with customers

We incur certain costs to obtain and fulfill contracts with customers, which we capitalize and amortize on a straight-line basis over the initial, non-cancellable term of the contract. We classify incremental costs of obtaining a contract with a customer in the “Contract acquisition costs and other” caption of our Balance Sheets, the related amortization in the “Contract investment amortization” caption of our Income Statements, and the cash flow impact in the “Contract acquisition costs” caption of our Statements of Cash Flows. We classify certain direct costs to fulfill a contract with a customer in the “Other noncurrent assets” caption of our Balance Sheets, and the related amortization in the “Owned, leased, and other-direct” caption of our Income Statements.

We had capitalized costs to fulfill contracts with customers of $313 million at September 30, 2018 and $295 million at December 31, 2017.

Practical Expedients and Exemptions

We do not disclose the amount of variable consideration that we expect to recognize in future periods in the following circumstances:

(1) if we recognize the revenue based on the amount invoiced for services performed;

(2) for sales-based or usage-based royalty promised in exchange for a license of intellectual property; or

(3) if the consideration is allocated entirely to a wholly unsatisfied promise to transfer a distinct service that forms part of a single performance obligation, and the terms of the consideration relate specifically to our efforts to transfer, or to a specific outcome from transferring the service.

We are required to collect certain taxes and fees from customers on behalf of governmental agencies and remit these back to the applicable governmental agencies on a periodic basis. We do not include these taxes in determining the transaction price.

Acquisitions and Dipositions	9 Months Ended
Acquisitions and Dipositions	Sep. 30, 2018
Discontinued Operations and Disposal Groups [Abstract]
Acquisitions and Dipositions	ACQUISITIONS AND DISPOSITIONS Acquisitions In the 2018 second quarter, we purchased the Sheraton Grand Phoenix, a North American Full-Service property that we manage, for $255 million. Dispositions In the 2018 third quarter, an equity method investee sold the JW Marriott Mexico City, and we recorded our share of the gain, $55 million, in the “Equity in earnings” caption of our Income Statements. In the 2018 second quarter, we sold two North American Full-Service properties — The Tremont Chicago Hotel at Magnificent Mile and Le Centre Sheraton Montreal Hotel — and two Asia Pacific properties — The Westin Denarau Island Resort and The Sheraton Fiji Resort. We recognized total gains of $79 million in the “Gains and other income, net” caption of our Income Statements in the 2018 first three quarters. In the 2018 second quarter, we sold our interest in three equity method investments, whose assets included a plot of land in Italy, the W Hotel Mexico City, and the Royal Orchid Sheraton Hotel & Towers in Bangkok, and we recognized total gains of $42 million in the “Gains and other income, net” caption of our Income Statements. Also in the 2018 second quarter, an equity method investee sold The Ritz-Carlton Toronto, and we recorded our share of the gain, $10 million, in the “Equity in earnings” caption of our Income Statements. In the 2018 first quarter, we sold two Caribbean and Latin America properties — The Sheraton Buenos Aires Hotel & Convention Center and Park Tower, A Luxury Collection Hotel, Buenos Aires. We recognized total gains of $53 million in the “Gains and other income, net” caption of our Income Statements.

Earnings Per Share

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Earnings Per Share

EARNINGS PER SHARE

The table below presents the reconciliation of the earnings and number of shares used in our calculations of basic and diluted earnings per share:



	Three Months Ended				Nine Months Ended
(in millions, except per share amounts)	September 30, 2018		September 30, 2017		September 30, 2018		September 30, 2017
Computation of Basic Earnings Per Share
Net income	$	483	$	485	$	1,491	$	1,345
Shares for basic earnings per share	346.7		372.3		352.8		378.5
Basic earnings per share	$	1.39	$	1.30	$	4.23	$	3.55
Computation of Diluted Earnings Per Share
Net income	$	483	$	485	$	1,491	$	1,345
Shares for basic earnings per share	346.7		372.3		352.8		378.5
Effect of dilutive securities
Share-based compensation	3.9		4.3		4.3		4.7
Shares for diluted earnings per share	350.6		376.6		357.1		383.2
Diluted earnings per share	$	1.38	$	1.29	$	4.18	$	3.51

Share-Based Compensation	9 Months Ended
Share-Based Compensation	Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	SHARE-BASED COMPENSATION We recorded share-based compensation expense of $47 million in the 2018 third quarter, $44 million in the 2017 third quarter, $140 million in the 2018 first three quarters, and $139 million in the 2017 first three quarters. Deferred compensation costs for unvested awards totaled $219 million at September 30, 2018 and $168 million at December 31, 2017. RSUs and PSUs We granted 1.4 million restricted stock units (“RSUs”) during the 2018 first three quarters to certain officers, and key employees, and those units vest generally over four years in equal annual installments commencing one year after the grant date. We also granted 0.1 million performance-based RSUs (“PSUs”) in the 2018 first three quarters to certain executive officers, which are earned, subject to continued employment and the satisfaction of certain performance conditions based on achievement of pre-established targets for RevPAR Index, room openings, and/or net administrative expense over, or at the end of, a three-year performance period. RSUs, including PSUs, granted in the 2018 first three quarters had a weighted average grant-date fair value of $133.

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES Our effective tax rate decreased to 14.9 percent for the 2018 third quarter from 34.3 percent for the 2017 third quarter, primarily due to the reduction of the U.S. federal tax rate under the Tax Cuts and Jobs Act of 2017 (the “2017 Tax Act”), increased earnings in jurisdictions with lower tax rates, tax benefits from dispositions, and adjustments resulting from finalizing prior years’ returns. The decrease was partially offset by the current period’s provisional estimate of tax for global intangible low-taxed income (“GILTI”) under the 2017 Tax Act. Our effective tax rate decreased to 20.1 percent for the 2018 first three quarters from 31.0 percent for the 2017 first three quarters, primarily due to the reduction of the U.S. federal tax rate under the 2017 Tax Act, increased earnings in jurisdictions with lower tax rates, and the release of tax reserves due to the completion of certain examinations. The decrease was partially offset by tax expense incurred for uncertain tax positions relating to legacy-Starwood operations, the current period’s provisional estimate of tax for GILTI under the 2017 Tax Act, increased state income tax due to a change in our position regarding the future remittance of a portion of the accumulated earnings of non-U.S. subsidiaries, the 2017 release of a tax reserve due to the favorable settlement of a tax position, and net tax expense on dispositions. We paid cash for income taxes, net of refunds, of $567 million in the 2018 first three quarters and $413 million in the 2017 first three quarters, an increase of $154 million primarily due to taxes paid for the 2017 gain on sale of our interest in Avendra. Tax Cuts and Jobs Act of 2017 Although we have not completed our accounting for the effects of the 2017 Tax Act, we have where possible made reasonable estimates of the 2017 Tax Act’s effects on our existing deferred tax balances and the Transition Tax, as described below. In cases where we have not been able to make reasonable estimates of the impact of the 2017 Tax Act, as described below, we continue to account for those items based on our existing accounting under ASC 740, Income Taxes, and the provisions of the tax laws that were in effect immediately before enactment of the 2017 Tax Act. In all cases, we will continue to refine our calculations as we complete additional analyses on the application of the law. As we complete our analysis, collect and prepare necessary data, and interpret any additional regulatory guidance, we may adjust the provisional amounts that we have recorded during a measurement period of up to one year from the enactment of the 2017 Tax Act that could materially impact our provision for income taxes, which could in turn materially affect our tax obligations and effective tax rate, in the periods in which we make such adjustments. Reduction of U.S. federal corporate tax rate. The 2017 Tax Act reduced the U.S. federal corporate tax rate from 35 percent to 21 percent, effective January 1, 2018. In 2017, we made a reasonable estimate of the net impact of the corporate tax rate reduction on our deferred tax assets and liabilities, which did not materially change in the 2018 first three quarters. However, our estimate could change as we complete our analyses of all impacts of the 2017 Tax Act, including, but not limited to, the state tax effect of adjustments made to federal temporary differences. Deemed Repatriation Transition Tax. The Transition Tax is a new one-time tax on previously untaxed earnings and profits (“E&P”) of certain of our foreign subsidiaries accumulated post-1986 through year-end 2017. In addition to U.S. federal income taxes, the deemed repatriation of such E&P may result in additional state income taxes in some of the U.S. states in which we operate. In the 2018 first three quarters, we reduced our Transition Tax provisional estimate and recorded a benefit of $5 million, resulting in a net provisional estimated federal and state Transition Tax of $740 million. This adjustment resulted from changes to E&P as a result of completing an IRS audit. Our total Transition Tax estimate could continue to change as we finalize our analysis of untaxed post-1986 E&P, amounts held in cash or other specified assets, and as audits of federal income taxes are completed. The 2017 Tax Act does not provide for additional income taxes for any remaining undistributed foreign earnings not subject to the Transition Tax, or for any additional outside basis differences inherent in foreign entities, as these amounts continue to be indefinitely reinvested in those foreign operations. Substantially all our unremitted foreign earnings that have not been previously taxed have now been subjected to U.S. taxation under the Transition Tax. In the 2018 first three quarters, we recorded a state tax expense of $27 million relating to our plan to remit a portion of the accumulated earnings of non-U.S. subsidiaries in the future. This estimate could change as we complete additional analyses of the impacts of the 2017 Tax Act. State net operating losses and valuation allowances. We must assess whether our state net operating loss valuation allowances are affected by various aspects of the 2017 Tax Act. As discussed above, we have recorded provisional amounts related to state income taxes for certain portions of the 2017 Tax Act, but we have not completed our analysis for the states where we have net operating loss carryovers and valuation allowances. Because we have not yet completed our determination of the need for, or any change in, any valuation allowance, we have not yet recorded any change to valuation allowances. Other provisions. The 2017 Tax Act also included a new provision designed to tax GILTI. Under GAAP, we are required to make an accounting policy election to either (1) treat any taxes on GILTI inclusions as a current-period expense when incurred (the “period cost method”) or (2) factor such amounts into our measurement of our deferred taxes (the “deferred method”). We adopted the period cost method and recorded a current provision for GILTI tax related to current-year operations in our estimated annual effective tax rate. This estimate could change as we complete additional analysis of the impacts of the 2017 Tax Act.

Commitments and Contingencies

9 Months Ended

Sep. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

COMMITMENTS AND CONTINGENCIES

Guarantees

We present the maximum potential amount of our future guarantee fundings and the carrying amount of our liability for our debt service, operating profit, and other guarantees (excluding contingent purchase obligations) for which we are the primary obligor at September 30, 2018 in the following table:



($ in millions) Guarantee Type	Maximum Potential Amount of Future Fundings		Recorded Liability for Guarantees
Debt service	$	129	$	18
Operating profit	219		109
Other	9		2
	$	357	$	129

Contingent Purchase Obligation

Sheraton Grand Chicago. We granted the owner a one-time right, exercisable in 2022, to require us to purchase the leasehold interest in the land and the hotel for $300 million in cash (the “put option”). If the owner exercises the put option, we have the option to purchase, at the same time the put transaction closes, the underlying fee simple interest in the land for an additional $200 million in cash. We accounted for the put option as a guarantee, and our recorded liability at September 30, 2018 was $57 million.

Long-Term Debt

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Long-Term Debt

LONG-TERM DEBT

We provide detail on our long-term debt balances, net of discounts, premiums, and debt issuance costs, in the following table at the end of the 2018 third quarter and year-end 2017:



	At Period End
($ in millions)	September 30, 2018			December 31, 2017
Senior Notes:
Series K Notes, interest rate of 3.0%, face amount of $600, maturing March 1, 2019 (effective interest rate of 4.4%)	$	599		$	598
Series L Notes, interest rate of 3.3%, face amount of $350, maturing September 15, 2022 (effective interest rate of 3.4%)	349			348
Series M Notes, interest rate of 3.4%, face amount of $350, maturing October 15, 2020 (effective interest rate of 3.6%)	348			348
Series N Notes, interest rate of 3.1%, face amount of $400, maturing October 15, 2021 (effective interest rate of 3.4%)	397			397
Series O Notes, interest rate of 2.9%, face amount of $450, maturing March 1, 2021 (effective interest rate of 3.1%)	448			447
Series P Notes, interest rate of 3.8%, face amount of $350, maturing October 1, 2025 (effective interest rate of 4.0%)	345			345
Series Q Notes, interest rate of 2.3%, face amount of $750, maturing January 15, 2022 (effective interest rate of 2.5%)	745			744
Series R Notes, interest rate of 3.1%, face amount of $750, maturing June 15, 2026 (effective interest rate of 3.3%)	743			743
Series S Notes, interest rate of 6.8%, face amount of $324, matured May 15, 2018 (effective interest rate of 1.7%)	—			330
Series T Notes, interest rate of 7.2%, face amount of $181, maturing December 1, 2019 (effective interest rate of 2.3%)	190			197
Series U Notes, interest rate of 3.1%, face amount of $291, maturing February 15, 2023 (effective interest rate of 3.1%)	291			291
Series V Notes, interest rate of 3.8%, face amount of $318, maturing March 15, 2025 (effective interest rate of 2.8%)	335			337
Series W Notes, interest rate of 4.5%, face amount of $278, maturing October 1, 2034 (effective interest rate of 4.1%)	292			292
Series X Notes, interest rate of 4.0%, face amount of $450, maturing April 15, 2028 (effective interest rate of 4.2%)	443			—
Commercial paper	3,419			2,371
Credit Facility	—			—
Capital lease obligations	167			171
Other	216			279
	$	9,327		$	8,238
Less: Current portion of long-term debt	(617		)	(398		)
	$	8,710		$	7,840

We paid cash for interest, net of amounts capitalized, of $204 million in the 2018 first three quarters and $171 million in the 2017 first three quarters.

We are party to a multicurrency revolving credit agreement (the “Credit Facility”) that provides for up to $4 billion of aggregate effective borrowings to support our commercial paper program and general corporate needs, including working capital, capital expenditures, share repurchases, letters of credit, and acquisitions. Borrowings under the Credit Facility generally bear interest at LIBOR (the London Interbank Offered Rate) plus a spread, based on our public debt rating. We also pay quarterly fees on the Credit Facility at a rate based on our public debt rating. While any outstanding commercial paper borrowings and/or borrowings under our Credit Facility generally have short-term maturities, we classify the outstanding borrowings as long-term based on our ability and intent to refinance the outstanding borrowings on a long-term basis. The Credit Facility expires on June 10, 2021. See the “Cash Requirements and Our Credit Facility” caption later in this report in the “Liquidity and Capital Resources” section of Item 2 below for further information on our Credit Facility and available borrowing capacity at September 30, 2018.

In the 2018 second quarter, we issued $450 million aggregate principal amount of 4.000 percent Series X Notes due April 15, 2028 (the “Series X Notes”). We will pay interest on the Series X Notes on April 15 and October 15 of each year, commencing on October 15, 2018. We received net proceeds of approximately $443 million from the offering of the Series X Notes, after deducting the underwriting discount and estimated expenses, which were made available for general corporate purposes, which may include working capital, capital expenditures, acquisitions, stock repurchases, or repayment of outstanding commercial paper or other borrowings.

Fair Value of Financial Instruments

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

FAIR VALUE OF FINANCIAL INSTRUMENTS

We believe that the fair values of our current assets and current liabilities approximate their reported carrying amounts. We present the carrying values and the fair values of noncurrent financial assets and liabilities that qualify as financial instruments, determined under current guidance for disclosures on the fair value of financial instruments, in the following table:



	September 30, 2018						December 31, 2017
($ in millions)	Carrying Amount			Fair Value			Carrying Amount			Fair Value
Senior, mezzanine, and other loans	$	122		$	112		$	142		$	130
Total noncurrent financial assets	$	122		$	112		$	142		$	130

Senior Notes	$	(4,926	)	$	(4,814	)	$	(5,087	)	$	(5,126	)
Commercial paper	(3,419		)	(3,419		)	(2,371		)	(2,371		)
Other long-term debt	(204		)	(204		)	(217		)	(221		)
Other noncurrent liabilities	(158		)	(158		)	(178		)	(178		)
Total noncurrent financial liabilities	$	(8,707	)	$	(8,595	)	$	(7,853	)	$	(7,896	)

See the “Fair Value Measurements” caption of Footnote 2. Summary of Significant Accounting Policies of our 2017 Form 10-K for more information on the input levels we use in determining fair value.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Accumulated Other Comprehensive Loss and Shareholders' Equity

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Accumulated Other Comprehensive Loss and Shareholders' Equity

ACCUMULATED OTHER COMPREHENSIVE LOSS AND SHAREHOLDERS’ EQUITY

The following tables detail the accumulated other comprehensive loss activity for the 2018 first three quarters and 2017 first three quarters:



($ in millions)	Foreign Currency Translation Adjustments			Derivative Instrument Adjustments			Available-For-Sale Securities Unrealized Adjustments			Pension and Postretirement Adjustments		Accumulated Other Comprehensive Loss
Balance at year-end 2017	$	(23	)	$	(10	)	$	4		$	12	$	(17	)
Other comprehensive (loss) income before reclassifications ⁽¹⁾	(313		)	7			—			—		(306		)
Amounts reclassified from accumulated other comprehensive loss	10			8			—			—		18
Net other comprehensive (loss) income	(303		)	15			—			—		(288		)
Adoption of ASU 2016-01	—			—			(4		)	—		(4		)
Balance at September 30, 2018	$	(326	)	$	5		$	—		$	12	$	(309	)



($ in millions)	Foreign Currency Translation Adjustments			Derivative Instrument Adjustments			Available-For-Sale Securities Unrealized Adjustments			Pension and Postretirement Adjustments		Accumulated Other Comprehensive Loss
Balance at year-end 2016	$	(503	)	$	(5	)	$	6		$	5	$	(497	)
Other comprehensive income (loss) before reclassifications ⁽¹⁾	457			(13		)	(1		)	—		443
Amounts reclassified from accumulated other comprehensive loss	—			5			—			—		5
Net other comprehensive income (loss)	457			(8		)	(1		)	—		448
Balance at September 30, 2017	$	(46	)	$	(13	)	$	5		$	5	$	(49	)


⁽¹⁾	Other comprehensive (loss) income before reclassifications for foreign currency translation adjustments includes intra-entity foreign currency transactions that are of a long-term investment nature, which resulted in a gain of $27 million for the 2018 first three quarters and loss of $142 million for the 2017 first three quarters.

The following table details the changes in common shares outstanding and shareholders’ equity for the 2018 first three quarters:



(in millions, except per share amounts)
Common Shares Outstanding			Total			Class A Common Stock		Additional Paid-in- Capital		Retained Earnings			Treasury Stock, at Cost			Accumulated Other Comprehensive Loss
359.1		Balance at year-end 2017 (as previously reported)	$	3,731		$	5	$	5,770	$	7,391		$	(9,418	)	$	(17	)
—		Adoption of ASU 2014-09	(149		)	—		—		(149		)	—			—
359.1		Balance at year-end 2017 (as adjusted)	3,582			5		5,770		7,242			(9,418		)	(17		)
—		Adoption of ASU 2016-01	—			—		—		4			—			(4		)
—		Adoption of ASU 2016-16	372			—		—		372			—			—
—		Net income	1,491			—		—		1,491			—			—
—		Other comprehensive loss	(288		)	—		—		—			—			(288		)
—		Dividends ($1.15 per share)	(404		)	—		—		(404		)	—			—
1.4		Share-based compensation plans	44			—		3		—			41			—
(18.5	)	Purchase of treasury stock	(2,473		)	—		—		—			(2,473		)	—
342.0		Balance at September 30, 2018	$	2,324		$	5	$	5,773	$	8,705		$	(11,850	)	$	(309	)

Business Segments

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Business Segments

BUSINESS SEGMENTS

We are a diversified global lodging company with operations in the following reportable business segments:


•	North American Full-Service, which includes our Luxury and Premium brands located in the U.S. and Canada;


•	North American Limited-Service, which includes our Select brands located in the U.S. and Canada; and


•	Asia Pacific, which includes all brand tiers in our Asia Pacific region.

The following operating segments do not meet the applicable accounting criteria for separate disclosure as reportable business segments: Caribbean and Latin America, Europe, and Middle East and Africa. We present these operating segments together as “Other International” in the tables below.

We evaluate the performance of our operating segments using “segment profits” which is based largely on the results of the segment without allocating corporate expenses, income taxes, indirect general, administrative, and other expenses, or merger-related costs and charges. We assign gains and losses, equity in earnings or losses from our joint ventures, and direct general, administrative, and other expenses to each of our segments. “Other unallocated corporate” represents a portion of our revenues, including license fees we receive from our credit card programs and fees from vacation ownership licensing agreements, general, administrative, and other expenses, merger-related costs and charges, equity in earnings or losses, and other gains or losses that we do not allocate to our segments. Beginning in the 2018 first quarter, “Other unallocated corporate” also includes revenues and expenses for our Loyalty Program, and we reflected this change in the prior period amounts shown in the tables below.

Our President and Chief Executive Officer, who is our chief operating decision maker, monitors assets for the consolidated company but does not use assets by operating segment when assessing performance or making operating segment resource allocations.

Segment Revenues



	Three Months Ended				Nine Months Ended
($ in millions)	September 30, 2018		September 30, 2017		September 30, 2018		September 30, 2017
North American Full-Service	$	3,123	$	3,096	$	9,778	$	9,613
North American Limited-Service	875		863		2,524		2,440
Asia Pacific	275		263		818		756
Other International	561		591		1,695		1,691
Total segment revenues	4,834		4,813		14,815		14,500
Other unallocated corporate	215		265		586		701
Total consolidated revenues	$	5,049	$	5,078	$	15,401	$	15,201

Segment Profits



	Three Months Ended						Nine Months Ended
($ in millions)	September 30, 2018			September 30, 2017			September 30, 2018			September 30, 2017
North American Full-Service	$	248		$	295		$	919		$	972
North American Limited-Service	206			255			640			685
Asia Pacific	106			93			358			260
Other International	176			140			495			371
Total segment profits	736			783			2,412			2,288
Other unallocated corporate	(87		)	18			(316		)	(149		)
Interest expense, net of interest income	(81		)	(63		)	(230		)	(191		)
Income taxes	(85		)	(253		)	(375		)	(603		)
Net income	$	483		$	485		$	1,491		$	1,345

Basis of Presentation (Policies)

9 Months Ended

Sep. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

New Accounting Standards

New Accounting Standards Not Yet Adopted

New Accounting Standards Adopted

When we adopted ASU 2014-09, we applied the following expedients and exemptions, which are allowed by the standard, to our prior period Financial Statements and disclosures:


•	We used the transaction price at the date of contract completion for our contracts that had variable consideration and were completed before January 1, 2018.


•	We considered the aggregate effect of all contract modifications that occurred before January 1, 2016 when: (1) identifying satisfied and unsatisfied performance obligations; (2) determining the transaction price; and (3) allocating the transaction price to the satisfied and unsatisfied performance obligations.


•	We did not: (1) disclose the amount of the transaction price that we allocated to remaining performance obligations; or (2) include an explanation of when we expect to recognize the revenue allocated to remaining performance obligations.

Performance Obligations

Contract Balances

Basis of Presentation (Tables)

9 Months Ended

Sep. 30, 2018

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Effects of Adoption of ASUs on Financial Statements

Income Statements



	Three Months Ended									Nine Months Ended
($ in millions, except per share amounts)	September 30, 2017 (As Previously Reported)			Adoption of ASU 2014-09			September 30, 2017 (As Adjusted)			September 30, 2017 (As Previously Reported)			Adoption of ASU 2014-09			September 30, 2017 (As Adjusted)
REVENUES
Base management fees	$	269		$	—		$	269		$	818		$	—		$	818
Franchise fees	426			(7		)	419			1,207			(25		)	1,182
Incentive management fees	136			2			138			437			(4		)	433
Gross fee revenues	831			(5		)	826			2,462			(29		)	2,433
Contract investment amortization	—			(11		)	(11		)	—			(34		)	(34		)
Net fee revenues	831			(16		)	815			2,462			(63		)	2,399
Owned, leased, and other revenue	452			(19		)	433			1,349			(40		)	1,309
Cost reimbursement revenue	4,380			(550		)	3,830			13,208			(1,715		)	11,493
	5,663			(585		)	5,078			17,019			(1,818		)	15,201
OPERATING COSTS AND EXPENSES
Owned, leased, and other-direct	356			(5		)	351			1,069			(12		)	1,057
Depreciation, amortization, and other	68			(14		)	54			218			(42		)	176
General, administrative, and other	199			6			205			635			16			651
Merger-related costs and charges	28			—			28			100			—			100
Reimbursed expenses	4,380			(730		)	3,650			13,208			(2,071		)	11,137
	5,031			(743		)	4,288			15,230			(2,109		)	13,121
OPERATING INCOME	632			158			790			1,789			291			2,080
Gains and other income, net	6			—			6			31			—			31
Interest expense	(73		)	—			(73		)	(216		)	—			(216		)
Interest income	9			—			9			24			—			24
Equity in earnings	6			—			6			29			—			29
INCOME BEFORE INCOME TAXES	580			158			738			1,657			291			1,948
Provision for income taxes	(188		)	(65		)	(253		)	(486		)	(117		)	(603		)
NET INCOME	$	392		$	93		$	485		$	1,171		$	174		$	1,345
EARNINGS PER SHARE
Earnings per share - basic	$	1.05		$	0.25		$	1.30		$	3.09		$	0.46		$	3.55
Earnings per share - diluted	$	1.04		$	0.25		$	1.29		$	3.06		$	0.45		$	3.51

Statements of Comprehensive Income



	Three Months Ended								Nine Months Ended
($ in millions)	September 30, 2017 (As Previously Reported)			Adoption of ASU 2014-09		September 30, 2017 (As Adjusted)			September 30, 2017 (As Previously Reported)			Adoption of ASU 2014-09		September 30, 2017 (As Adjusted)
Net income	$	392		$	93	$	485		$	1,171		$	174	$	1,345
Other comprehensive income:
Foreign currency translation adjustments	107			—		107			457			—		457
Derivative instrument adjustments, net of tax	(5		)	—		(5		)	(13		)	—		(13		)
Unrealized gain (loss) on available-for-sale securities, net of tax	1			—		1			(1		)	—		(1		)
Pension and postretirement adjustments, net of tax	—			—		—			—			—		—
Reclassification of losses, net of tax	4			—		4			5			—		5
Total other comprehensive income, net of tax	107			—		107			448			—		448
Comprehensive income	$	499		$	93	$	592		$	1,619		$	174	$	1,793

Balance Sheets



($ in millions)	December 31, 2017 (As Previously Reported) ⁽¹⁾			Adoption of ASU 2014-09			December 31, 2017 (As Adjusted)
ASSETS
Current assets
Cash and equivalents	$	383		$	—		$	383
Accounts and notes receivable, net	1,999			(26		)	1,973
Prepaid expenses and other	216			19			235
Assets held for sale	149			—			149
	2,747			(7		)	2,740
Property and equipment, net	1,793			—			1,793
Intangible assets
Brands	5,922			—			5,922
Contract acquisition costs and other	2,884			(262		)	2,622
Goodwill	9,207			—			9,207
	18,013			(262		)	17,751
Equity method investments	735			(1		)	734
Notes receivable, net	142			—			142
Deferred tax assets	93			—			93
Other noncurrent assets	426			167			593
	$	23,949		$	(103	)	$	23,846
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities
Current portion of long-term debt	$	398		$	—		$	398
Accounts payable	783			—			783
Accrued payroll and benefits	1,214			—			1,214
Liability for guest loyalty program	2,064			57			2,121
Accrued expenses and other	1,541			(250		)	1,291
	6,000			(193		)	5,807
Long-term debt	7,840			—			7,840
Liability for guest loyalty program	2,876			(57		)	2,819
Deferred tax liabilities	604			1			605
Deferred revenue	145			438			583
Other noncurrent liabilities	2,753			(143		)	2,610
Shareholders' equity
Class A Common Stock	5			—			5
Additional paid-in-capital	5,770			—			5,770
Retained earnings	7,391			(149		)	7,242
Treasury stock, at cost	(9,418		)	—			(9,418		)
Accumulated other comprehensive loss	(17		)	—			(17		)
	3,731			(149		)	3,582
	$	23,949		$	(103	)	$	23,846


⁽¹⁾	Includes reclassifications among various captions, including Deferred revenue and Other noncurrent liabilities, to conform to current period presentation.

Statements of Cash Flows



	Nine Months Ended									Nine Months Ended
($ in millions)	September 30, 2017 (As Previously Reported)			Adoption of ASU 2014-09			Adoption of ASUs 2016-18 and 2016-15			September 30, 2017 (As Adjusted)
OPERATING ACTIVITIES
Net income	$	1,171		$	174		$	—		$	1,345
Adjustments to reconcile to cash provided by operating activities:
Depreciation, amortization, and other	218			(8		)	—			210
Share-based compensation	139			—			—			139
Income taxes	73			117			—			190
Liability for guest loyalty program	236			(80		)	—			156
Contract acquisition costs	—			(126		)	—			(126		)
Merger-related charges	(117		)	—			—			(117		)
Working capital changes	98			(219		)	(3		)	(124		)
Gain on asset dispositions	(30		)	—			—			(30		)
Other	128			5			(25		)	108
Net cash provided by (used in) operating activities	1,916			(137		)	(28		)	1,751
INVESTING ACTIVITIES
Capital expenditures	(155		)	—			—			(155		)
Dispositions	482			—			—			482
Loan advances	(85		)	—			—			(85		)
Loan collections	91			—			—			91
Contract acquisition costs	(129		)	129			—			—
Other	(14		)	8			—			(6		)
Net cash provided by investing activities	190			137			—			327
FINANCING ACTIVITIES
Commercial paper/Credit Facility, net	455			—			25			480
Issuance of long-term debt	1			—			—			1
Repayment of long-term debt	(305		)	—			—			(305		)
Issuance of Class A Common Stock	4			—			—			4
Dividends paid	(362		)	—			—			(362		)
Purchase of treasury stock	(2,105		)	—			—			(2,105		)
Share-based compensation withholding taxes	(144		)	—			—			(144		)
Net cash (used in) provided by financing activities	(2,456		)	—			25			(2,431		)
(DECREASE) INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	(350		)	—			(3		)	(353		)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period	858			—			29			887
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period	$	508		$	—		$	26		$	534

Revenues (Tables)

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following tables present our revenues disaggregated by major revenue stream for the three and nine months ended September 30, 2018 and September 30, 2017.



	Three Months Ended September 30, 2018
($ in millions)	North American Full-Service			North American Limited-Service			Asia Pacific		Other International			Total
Gross fee revenues	$	305		$	246		$	119	$	135		$	805
Contract investment amortization	(7		)	(3		)	—		(3		)	(13		)
Net fee revenues	298			243			119		132			792
Owned, leased, and other revenue	137			34			46		165			382
Cost reimbursement revenue	2,688			598			110		264			3,660
Total segment revenue	$	3,123		$	875		$	275	$	561		$	4,834
Unallocated corporate												215
Total revenue												$	5,049



	Three Months Ended September 30, 2017
($ in millions)	North American Full-Service			North American Limited-Service			Asia Pacific		Other International			Total
Gross fee revenues	$	285		$	232		$	106	$	118		$	741
Contract investment amortization	(7		)	(2		)	—		(2		)	(11		)
Net fee revenues	278			230			106		116			730
Owned, leased, and other revenue	157			37			48		179			421
Cost reimbursement revenue	2,661			596			109		296			3,662
Total segment revenue	$	3,096		$	863		$	263	$	591		$	4,813
Unallocated corporate												265
Total revenue												$	5,078



	Nine Months Ended September 30, 2018
($ in millions)	North American Full-Service			North American Limited-Service			Asia Pacific			Other International			Total
Gross fee revenues	$	949		$	692		$	346		$	385		$	2,372
Contract investment amortization	(25		)	(9		)	(1		)	(9		)	(44		)
Net fee revenues	924			683			345			376			2,328
Owned, leased, and other revenue	432			104			141			501			1,178
Cost reimbursement revenue	8,422			1,737			332			818			11,309
Total segment revenue	$	9,778		$	2,524		$	818		$	1,695		$	14,815
Unallocated corporate													586
Total revenue													$	15,401



	Nine Months Ended September 30, 2017
($ in millions)	North American Full-Service			North American Limited-Service			Asia Pacific			Other International			Total
Gross fee revenues	$	891		$	643		$	301		$	349		$	2,184
Contract investment amortization	(19		)	(8		)	(1		)	(6		)	(34		)
Net fee revenues	872			635			300			343			2,150
Owned, leased, and other revenue	535			100			138			503			1,276
Cost reimbursement revenue	8,206			1,705			318			845			11,074
Total segment revenue	$	9,613		$	2,440		$	756		$	1,691		$	14,500
Unallocated corporate													701
Total revenue													$	15,201

Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Reconciliation of the Earnings and Number of Shares Used in Calculations of Basic and Diluted Earnings Per Share

The table below presents the reconciliation of the earnings and number of shares used in our calculations of basic and diluted earnings per share:



	Three Months Ended				Nine Months Ended
(in millions, except per share amounts)	September 30, 2018		September 30, 2017		September 30, 2018		September 30, 2017
Computation of Basic Earnings Per Share
Net income	$	483	$	485	$	1,491	$	1,345
Shares for basic earnings per share	346.7		372.3		352.8		378.5
Basic earnings per share	$	1.39	$	1.30	$	4.23	$	3.55
Computation of Diluted Earnings Per Share
Net income	$	483	$	485	$	1,491	$	1,345
Shares for basic earnings per share	346.7		372.3		352.8		378.5
Effect of dilutive securities
Share-based compensation	3.9		4.3		4.3		4.7
Shares for diluted earnings per share	350.6		376.6		357.1		383.2
Diluted earnings per share	$	1.38	$	1.29	$	4.18	$	3.51

Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Maximum Potential Amount of Future Fundings as the Primary Obligor for Guarantees and the Liability for Expected Future Fundings



($ in millions) Guarantee Type	Maximum Potential Amount of Future Fundings		Recorded Liability for Guarantees
Debt service	$	129	$	18
Operating profit	219		109
Other	9		2
	$	357	$	129

Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Long-Term Debt

We provide detail on our long-term debt balances, net of discounts, premiums, and debt issuance costs, in the following table at the end of the 2018 third quarter and year-end 2017:



	At Period End
($ in millions)	September 30, 2018			December 31, 2017
Senior Notes:
Series K Notes, interest rate of 3.0%, face amount of $600, maturing March 1, 2019 (effective interest rate of 4.4%)	$	599		$	598
Series L Notes, interest rate of 3.3%, face amount of $350, maturing September 15, 2022 (effective interest rate of 3.4%)	349			348
Series M Notes, interest rate of 3.4%, face amount of $350, maturing October 15, 2020 (effective interest rate of 3.6%)	348			348
Series N Notes, interest rate of 3.1%, face amount of $400, maturing October 15, 2021 (effective interest rate of 3.4%)	397			397
Series O Notes, interest rate of 2.9%, face amount of $450, maturing March 1, 2021 (effective interest rate of 3.1%)	448			447
Series P Notes, interest rate of 3.8%, face amount of $350, maturing October 1, 2025 (effective interest rate of 4.0%)	345			345
Series Q Notes, interest rate of 2.3%, face amount of $750, maturing January 15, 2022 (effective interest rate of 2.5%)	745			744
Series R Notes, interest rate of 3.1%, face amount of $750, maturing June 15, 2026 (effective interest rate of 3.3%)	743			743
Series S Notes, interest rate of 6.8%, face amount of $324, matured May 15, 2018 (effective interest rate of 1.7%)	—			330
Series T Notes, interest rate of 7.2%, face amount of $181, maturing December 1, 2019 (effective interest rate of 2.3%)	190			197
Series U Notes, interest rate of 3.1%, face amount of $291, maturing February 15, 2023 (effective interest rate of 3.1%)	291			291
Series V Notes, interest rate of 3.8%, face amount of $318, maturing March 15, 2025 (effective interest rate of 2.8%)	335			337
Series W Notes, interest rate of 4.5%, face amount of $278, maturing October 1, 2034 (effective interest rate of 4.1%)	292			292
Series X Notes, interest rate of 4.0%, face amount of $450, maturing April 15, 2028 (effective interest rate of 4.2%)	443			—
Commercial paper	3,419			2,371
Credit Facility	—			—
Capital lease obligations	167			171
Other	216			279
	$	9,327		$	8,238
Less: Current portion of long-term debt	(617		)	(398		)
	$	8,710		$	7,840

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.22)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 505
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 235
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-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 505
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-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Carrying Values and Fair Values of Non-Current Financial Assets and Liabilities

We present the carrying values and the fair values of noncurrent financial assets and liabilities that qualify as financial instruments, determined under current guidance for disclosures on the fair value of financial instruments, in the following table:



	September 30, 2018						December 31, 2017
($ in millions)	Carrying Amount			Fair Value			Carrying Amount			Fair Value
Senior, mezzanine, and other loans	$	122		$	112		$	142		$	130
Total noncurrent financial assets	$	122		$	112		$	142		$	130

Senior Notes	$	(4,926	)	$	(4,814	)	$	(5,087	)	$	(5,126	)
Commercial paper	(3,419		)	(3,419		)	(2,371		)	(2,371		)
Other long-term debt	(204		)	(204		)	(217		)	(221		)
Other noncurrent liabilities	(158		)	(158		)	(178		)	(178		)
Total noncurrent financial liabilities	$	(8,707	)	$	(8,595	)	$	(7,853	)	$	(7,896	)

Accumulated Other Comprehensive Loss and Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss) Activity

The following tables detail the accumulated other comprehensive loss activity for the 2018 first three quarters and 2017 first three quarters:



($ in millions)	Foreign Currency Translation Adjustments			Derivative Instrument Adjustments			Available-For-Sale Securities Unrealized Adjustments			Pension and Postretirement Adjustments		Accumulated Other Comprehensive Loss
Balance at year-end 2017	$	(23	)	$	(10	)	$	4		$	12	$	(17	)
Other comprehensive (loss) income before reclassifications ⁽¹⁾	(313		)	7			—			—		(306		)
Amounts reclassified from accumulated other comprehensive loss	10			8			—			—		18
Net other comprehensive (loss) income	(303		)	15			—			—		(288		)
Adoption of ASU 2016-01	—			—			(4		)	—		(4		)
Balance at September 30, 2018	$	(326	)	$	5		$	—		$	12	$	(309	)



($ in millions)	Foreign Currency Translation Adjustments			Derivative Instrument Adjustments			Available-For-Sale Securities Unrealized Adjustments			Pension and Postretirement Adjustments		Accumulated Other Comprehensive Loss
Balance at year-end 2016	$	(503	)	$	(5	)	$	6		$	5	$	(497	)
Other comprehensive income (loss) before reclassifications ⁽¹⁾	457			(13		)	(1		)	—		443
Amounts reclassified from accumulated other comprehensive loss	—			5			—			—		5
Net other comprehensive income (loss)	457			(8		)	(1		)	—		448
Balance at September 30, 2017	$	(46	)	$	(13	)	$	5		$	5	$	(49	)


⁽¹⁾	Other comprehensive (loss) income before reclassifications for foreign currency translation adjustments includes intra-entity foreign currency transactions that are of a long-term investment nature, which resulted in a gain of $27 million for the 2018 first three quarters and loss of $142 million for the 2017 first three quarters.

Changes in Shareholders' Equity (Deficit)

The following table details the changes in common shares outstanding and shareholders’ equity for the 2018 first three quarters:



(in millions, except per share amounts)
Common Shares Outstanding			Total			Class A Common Stock		Additional Paid-in- Capital		Retained Earnings			Treasury Stock, at Cost			Accumulated Other Comprehensive Loss
359.1		Balance at year-end 2017 (as previously reported)	$	3,731		$	5	$	5,770	$	7,391		$	(9,418	)	$	(17	)
—		Adoption of ASU 2014-09	(149		)	—		—		(149		)	—			—
359.1		Balance at year-end 2017 (as adjusted)	3,582			5		5,770		7,242			(9,418		)	(17		)
—		Adoption of ASU 2016-01	—			—		—		4			—			(4		)
—		Adoption of ASU 2016-16	372			—		—		372			—			—
—		Net income	1,491			—		—		1,491			—			—
—		Other comprehensive loss	(288		)	—		—		—			—			(288		)
—		Dividends ($1.15 per share)	(404		)	—		—		(404		)	—			—
1.4		Share-based compensation plans	44			—		3		—			41			—
(18.5	)	Purchase of treasury stock	(2,473		)	—		—		—			(2,473		)	—
342.0		Balance at September 30, 2018	$	2,324		$	5	$	5,773	$	8,705		$	(11,850	)	$	(309	)

Business Segments (Tables)

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Segment Revenues



	Three Months Ended				Nine Months Ended
($ in millions)	September 30, 2018		September 30, 2017		September 30, 2018		September 30, 2017
North American Full-Service	$	3,123	$	3,096	$	9,778	$	9,613
North American Limited-Service	875		863		2,524		2,440
Asia Pacific	275		263		818		756
Other International	561		591		1,695		1,691
Total segment revenues	4,834		4,813		14,815		14,500
Other unallocated corporate	215		265		586		701
Total consolidated revenues	$	5,049	$	5,078	$	15,401	$	15,201

Segment Profits



	Three Months Ended						Nine Months Ended
($ in millions)	September 30, 2018			September 30, 2017			September 30, 2018			September 30, 2017
North American Full-Service	$	248		$	295		$	919		$	972
North American Limited-Service	206			255			640			685
Asia Pacific	106			93			358			260
Other International	176			140			495			371
Total segment profits	736			783			2,412			2,288
Other unallocated corporate	(87		)	18			(316		)	(149		)
Interest expense, net of interest income	(81		)	(63		)	(230		)	(191		)
Income taxes	(85		)	(253		)	(375		)	(603		)
Net income	$	483		$	485		$	1,491		$	1,345

Basis of Presentation - Narrative (Details) - USD ($) $ in Millions	Jan. 01, 2019	Jan. 01, 2018	Dec. 31, 2017	Jan. 01, 2016
Adoption of ASU 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment of accounting principle		$ 372
Adoption of ASU 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment of accounting principle		0
Adoption of ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment of accounting principle			$ (149)
Retained Earnings \| Adoption of ASU 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment of accounting principle		372
Retained Earnings \| Adoption of ASU 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment of accounting principle		$ 4
Retained Earnings \| Adoption of ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment of accounting principle			$ (149)	$ 264
Minimum \| Scenario, Forecast \| Adoption of ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease assets	$ 1,000
Operating lease liabilities	1,000
Maximum \| Scenario, Forecast \| Adoption of ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease assets	1,200
Operating lease liabilities	$ 1,200

Basis of Presentation - Effect of Adoption of ASU 2014-09 on Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
REVENUES
Revenues	$ 5,049	$ 5,078	$ 15,401	$ 15,201
OPERATING COSTS AND EXPENSES
Depreciation, amortization, and other	52	54	164	176
General, administrative, and other	221	205	685	651
Merger-related costs and charges	12	28	64	100
Costs and expenses	4,479	4,288	13,591	13,121
OPERATING INCOME	570	790	1,810	2,080
Gains and other income, net	18	6	191	31
Interest expense	(86)	(73)	(246)	(216)
Interest income	5	9	16	24
Equity in earnings	61	6	95	29
INCOME BEFORE INCOME TAXES	568	738	1,866	1,948
Income taxes	(85)	(253)	(375)	(603)
NET INCOME	$ 483	$ 485	$ 1,491	$ 1,345
EARNINGS PER SHARE
Earnings per share - basic (in USD per share)	$ 1.39	$ 1.30	$ 4.23	$ 3.55
Earnings per share - diluted (in USD per share)	$ 1.38	$ 1.29	$ 4.18	$ 3.51
Base management fees
REVENUES
Gross revenues	$ 279	$ 269	$ 852	$ 818
Franchise fees
REVENUES
Gross revenues	502	419	1,394	1,182
Incentive management fees
REVENUES
Gross revenues	151	138	482	433
Fee revenues
REVENUES
Gross revenues	932	826	2,728	2,433
Contract investment amortization	(13)	(11)	(44)	(34)
Revenues	919	815	2,684	2,399
Owned, leased, and other
REVENUES
Revenues	397	433	1,226	1,309
OPERATING COSTS AND EXPENSES
Operating costs	315	351	985	1,057
Reimbursements
REVENUES
Revenues	3,733	3,830	11,491	11,493
OPERATING COSTS AND EXPENSES
Operating costs	$ 3,879	3,650	$ 11,693	11,137
As Previously Reported
REVENUES
Revenues		5,663		17,019
OPERATING COSTS AND EXPENSES
Depreciation, amortization, and other		68		218
General, administrative, and other		199		635
Merger-related costs and charges		28		100
Costs and expenses		5,031		15,230
OPERATING INCOME		632		1,789
Gains and other income, net		6		31
Interest expense		(73)		(216)
Interest income		9		24
Equity in earnings		6		29
INCOME BEFORE INCOME TAXES		580		1,657
Income taxes		(188)		(486)
NET INCOME		$ 392		$ 1,171
EARNINGS PER SHARE
Earnings per share - basic (in USD per share)		$ 1.05		$ 3.09
Earnings per share - diluted (in USD per share)		$ 1.04		$ 3.06
As Previously Reported \| Base management fees
REVENUES
Gross revenues		$ 269		$ 818
As Previously Reported \| Franchise fees
REVENUES
Gross revenues		426		1,207
As Previously Reported \| Incentive management fees
REVENUES
Gross revenues		136		437
As Previously Reported \| Fee revenues
REVENUES
Gross revenues		831		2,462
Contract investment amortization		0		0
Revenues		831		2,462
As Previously Reported \| Owned, leased, and other
REVENUES
Revenues		452		1,349
OPERATING COSTS AND EXPENSES
Operating costs		356		1,069
As Previously Reported \| Reimbursements
REVENUES
Revenues		4,380		13,208
OPERATING COSTS AND EXPENSES
Operating costs		4,380		13,208
Adjustment \| Adoption of ASU 2014-09
REVENUES
Revenues		(585)		(1,818)
OPERATING COSTS AND EXPENSES
Depreciation, amortization, and other		(14)		(42)
General, administrative, and other		6		16
Merger-related costs and charges		0		0
Costs and expenses		(743)		(2,109)
OPERATING INCOME		158		291
Gains and other income, net		0		0
Interest expense		0		0
Interest income		0		0
Equity in earnings		0		0
INCOME BEFORE INCOME TAXES		158		291
Income taxes		(65)		(117)
NET INCOME		$ 93		$ 174
EARNINGS PER SHARE
Earnings per share - basic (in USD per share)		$ 0.25		$ 0.46
Earnings per share - diluted (in USD per share)		$ 0.25		$ 0.45
Adjustment \| Base management fees \| Adoption of ASU 2014-09
REVENUES
Gross revenues		$ 0		$ 0
Adjustment \| Franchise fees \| Adoption of ASU 2014-09
REVENUES
Gross revenues		(7)		(25)
Adjustment \| Incentive management fees \| Adoption of ASU 2014-09
REVENUES
Gross revenues		2		(4)
Adjustment \| Fee revenues \| Adoption of ASU 2014-09
REVENUES
Gross revenues		(5)		(29)
Contract investment amortization		(11)		(34)
Revenues		(16)		(63)
Adjustment \| Owned, leased, and other \| Adoption of ASU 2014-09
REVENUES
Revenues		(19)		(40)
OPERATING COSTS AND EXPENSES
Operating costs		(5)		(12)
Adjustment \| Reimbursements \| Adoption of ASU 2014-09
REVENUES
Revenues		(550)		(1,715)
OPERATING COSTS AND EXPENSES
Operating costs		$ (730)		$ (2,071)

Basis of Presentation - Effect of Adoption of ASU 2014-09 on Statement of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income	$ 483	$ 485	$ 1,491	$ 1,345
Other comprehensive income (loss):
Foreign currency translation adjustments	(66)	107	(313)	457
Derivative instrument adjustments, net of tax	(1)	(5)	7	(13)
Unrealized gain (loss) on available-for-sale securities, net of tax	0	1	0	(1)
Pension and postretirement adjustments, net of tax	0	0	0	0
Reclassification of losses, net of tax	2	4	18	5
Net other comprehensive (loss) income	(65)	107	(288)	448
Comprehensive income	$ 418	592	$ 1,203	1,793
As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income		392		1,171
Other comprehensive income (loss):
Foreign currency translation adjustments		107		457
Derivative instrument adjustments, net of tax		(5)		(13)
Unrealized gain (loss) on available-for-sale securities, net of tax		1		(1)
Pension and postretirement adjustments, net of tax		0		0
Reclassification of losses, net of tax		4		5
Net other comprehensive (loss) income		107		448
Comprehensive income		499		1,619
Adjustment \| Adoption of ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income		93		174
Other comprehensive income (loss):
Foreign currency translation adjustments		0		0
Derivative instrument adjustments, net of tax		0		0
Unrealized gain (loss) on available-for-sale securities, net of tax		0		0
Pension and postretirement adjustments, net of tax		0		0
Reclassification of losses, net of tax		0		0
Net other comprehensive (loss) income		0		0
Comprehensive income		$ 93		$ 174

Basis of Presentation - Effect of Adoption of ASU 2014-09 on Balance Sheets (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current assets
Cash and equivalents	$ 373	$ 383
Accounts and notes receivable, net	2,175	1,973
Prepaid expenses and other	242	235
Assets held for sale	13	149
Assets, current, total	2,803	2,740
Property and equipment, net	1,967	1,793
Intangible assets
Goodwill	9,067	9,207
Goodwill and intangible assets, net, total	17,470	17,751
Equity method investments	689	734
Notes receivable, net	122	142
Deferred tax assets	171	93
Other noncurrent assets	611	593
Total assets	23,833	23,846
Current liabilities
Current portion of long-term debt	617	398
Accounts payable	759	783
Accrued payroll and benefits	1,253	1,214
Accrued expenses and other	1,117	1,291
Liabilities, current, total	6,051	5,807
Long-term debt	8,710	7,840
Deferred tax liabilities	551	605
Other noncurrent liabilities	2,248	2,610
Shareholders’ equity
Class A Common Stock	5	5
Additional paid-in-capital	5,773	5,770
Retained earnings	8,705	7,242
Treasury stock, at cost	(11,850)	(9,418)
Accumulated other comprehensive loss	(309)	(17)
Stockholders' equity (deficit) attributable to parent	2,324	3,582
Liabilities and equity (deficit), total	23,833	23,846
Brands
Intangible assets
Intangible assets	5,809	5,922
Contract acquisition costs and other
Intangible assets
Intangible assets	2,594	2,622
Deferred revenue
Current liabilities
Contract with customer	632	583
Liability for guest loyalty program
Current liabilities
Liability for guest loyalty program	2,305	2,121
Contract with customer	$ 3,317	2,819
As Previously Reported
Current assets
Cash and equivalents		383
Accounts and notes receivable, net		1,999
Prepaid expenses and other		216
Assets held for sale		149
Assets, current, total		2,747
Property and equipment, net		1,793
Intangible assets
Goodwill		9,207
Goodwill and intangible assets, net, total		18,013
Equity method investments		735
Notes receivable, net		142
Deferred tax assets		93
Other noncurrent assets		426
Total assets		23,949
Current liabilities
Current portion of long-term debt		398
Accounts payable		783
Accrued payroll and benefits		1,214
Accrued expenses and other		1,541
Liabilities, current, total		6,000
Long-term debt		7,840
Deferred tax liabilities		604
Other noncurrent liabilities		2,753
Shareholders’ equity
Class A Common Stock		5
Additional paid-in-capital		5,770
Retained earnings		7,391
Treasury stock, at cost		(9,418)
Accumulated other comprehensive loss		(17)
Stockholders' equity (deficit) attributable to parent		3,731
Liabilities and equity (deficit), total		23,949
As Previously Reported \| Brands
Intangible assets
Intangible assets		5,922
As Previously Reported \| Contract acquisition costs and other
Intangible assets
Intangible assets		2,884
As Previously Reported \| Deferred revenue
Current liabilities
Contract with customer		145
As Previously Reported \| Liability for guest loyalty program
Current liabilities
Liability for guest loyalty program		2,064
Contract with customer		2,876
Adjustment \| Adoption of ASU 2014-09
Current assets
Cash and equivalents		0
Accounts and notes receivable, net		(26)
Prepaid expenses and other		19
Assets held for sale		0
Assets, current, total		(7)
Property and equipment, net		0
Intangible assets
Goodwill		0
Goodwill and intangible assets, net, total		(262)
Equity method investments		(1)
Notes receivable, net		0
Deferred tax assets		0
Other noncurrent assets		167
Total assets		(103)
Current liabilities
Current portion of long-term debt		0
Accounts payable		0
Accrued payroll and benefits		0
Accrued expenses and other		(250)
Liabilities, current, total		(193)
Long-term debt		0
Deferred tax liabilities		1
Other noncurrent liabilities		(143)
Shareholders’ equity
Class A Common Stock		0
Additional paid-in-capital		0
Retained earnings		(149)
Treasury stock, at cost		0
Accumulated other comprehensive loss		0
Stockholders' equity (deficit) attributable to parent		(149)
Liabilities and equity (deficit), total		(103)
Adjustment \| Adoption of ASU 2014-09 \| Brands
Intangible assets
Intangible assets		0
Adjustment \| Adoption of ASU 2014-09 \| Contract acquisition costs and other
Intangible assets
Intangible assets		(262)
Adjustment \| Deferred revenue \| Adoption of ASU 2014-09
Current liabilities
Contract with customer		438
Adjustment \| Liability for guest loyalty program \| Adoption of ASU 2014-09
Current liabilities
Liability for guest loyalty program		57
Contract with customer		$ (57)

Basis of Presentation - Effect of Adoption of ASU 2014-09 on Statement of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
OPERATING ACTIVITIES
Net income	$ 483	$ 485	$ 1,491	$ 1,345
Adjustments to reconcile to cash provided by operating activities:
Depreciation, amortization, and other			208	210
Share-based compensation			140	139
Income taxes			(192)	190
Contract acquisition costs			(110)	(126)
Merger-related charges			(37)	(117)
Working capital changes			(233)	(124)
Gain on asset dispositions			(191)	(30)
Other			67	108
Net cash provided by (used in) operating activities			1,824	1,751
INVESTING ACTIVITIES
Capital expenditures			(462)	(155)
Dispositions			460	482
Loan advances			(13)	(85)
Loan collections			47	91
Contract acquisition costs				0
Other			49	(6)
Net cash provided by investing activities			81	327
FINANCING ACTIVITIES
Commercial paper/Credit Facility, net			1,045	480
Issuance of long-term debt			443	1
Repayment of long-term debt			(391)	(305)
Issuance of Class A Common Stock			4	4
Dividends paid			(404)	(362)
Purchase of treasury stock			(2,513)	(2,105)
Share-based compensation withholding taxes			(105)	(144)
Net cash provided by (used in) financing activities			(1,921)	(2,431)
DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH			(16)	(353)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period			429	887
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period	$ 413	534	413	534
Liability for guest loyalty program
Adjustments to reconcile to cash provided by operating activities:
Liability for guest loyalty program			$ 681	156
As Previously Reported
OPERATING ACTIVITIES
Net income		392		1,171
Adjustments to reconcile to cash provided by operating activities:
Depreciation, amortization, and other				218
Share-based compensation				139
Income taxes				73
Contract acquisition costs				0
Merger-related charges				(117)
Working capital changes				98
Gain on asset dispositions				(30)
Other				128
Net cash provided by (used in) operating activities				1,916
INVESTING ACTIVITIES
Capital expenditures				(155)
Dispositions				482
Loan advances				(85)
Loan collections				91
Contract acquisition costs				(129)
Other				(14)
Net cash provided by investing activities				190
FINANCING ACTIVITIES
Commercial paper/Credit Facility, net				455
Issuance of long-term debt				1
Repayment of long-term debt				(305)
Issuance of Class A Common Stock				4
Dividends paid				(362)
Purchase of treasury stock				(2,105)
Share-based compensation withholding taxes				(144)
Net cash provided by (used in) financing activities				(2,456)
DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH				(350)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period				858
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period		508		508
As Previously Reported \| Liability for guest loyalty program
Adjustments to reconcile to cash provided by operating activities:
Liability for guest loyalty program				236
Adjustment \| Adoption of ASU 2014-09
OPERATING ACTIVITIES
Net income		93		174
Adjustments to reconcile to cash provided by operating activities:
Depreciation, amortization, and other				(8)
Share-based compensation				0
Income taxes				117
Contract acquisition costs				(126)
Merger-related charges				0
Working capital changes				(219)
Gain on asset dispositions				0
Other				5
Net cash provided by (used in) operating activities				(137)
INVESTING ACTIVITIES
Capital expenditures				0
Dispositions				0
Loan advances				0
Loan collections				0
Contract acquisition costs				129
Other				8
Net cash provided by investing activities				137
FINANCING ACTIVITIES
Commercial paper/Credit Facility, net				0
Issuance of long-term debt				0
Repayment of long-term debt				0
Issuance of Class A Common Stock				0
Dividends paid				0
Purchase of treasury stock				0
Share-based compensation withholding taxes				0
Net cash provided by (used in) financing activities				0
DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH				0
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period				0
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period		0		0
Adjustment \| Adoption of ASUs 2016-18 and 2016-15
OPERATING ACTIVITIES
Net income				0
Adjustments to reconcile to cash provided by operating activities:
Depreciation, amortization, and other				0
Share-based compensation				0
Income taxes				0
Contract acquisition costs				0
Merger-related charges				0
Working capital changes				(3)
Gain on asset dispositions				0
Other				(25)
Net cash provided by (used in) operating activities				(28)
INVESTING ACTIVITIES
Capital expenditures				0
Dispositions				0
Loan advances				0
Loan collections				0
Contract acquisition costs				0
Other				0
Net cash provided by investing activities				0
FINANCING ACTIVITIES
Commercial paper/Credit Facility, net				25
Issuance of long-term debt				0
Repayment of long-term debt				0
Issuance of Class A Common Stock				0
Dividends paid				0
Purchase of treasury stock				0
Share-based compensation withholding taxes				0
Net cash provided by (used in) financing activities				25
DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH				(3)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period				29
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period		$ 26		26
Adjustment \| Liability for guest loyalty program \| Adoption of ASU 2014-09
Adjustments to reconcile to cash provided by operating activities:
Liability for guest loyalty program				(80)
Adjustment \| Liability for guest loyalty program \| Adoption of ASUs 2016-18 and 2016-15
Adjustments to reconcile to cash provided by operating activities:
Liability for guest loyalty program				$ 0

Revenues - Disaggregation of Revenue Stream (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 5,049	$ 5,078	$ 15,401	$ 15,201
Segments
Disaggregation of Revenue [Line Items]
Revenues	4,834	4,813	14,815	14,500
Segments \| North American Full-Service
Disaggregation of Revenue [Line Items]
Revenues	3,123	3,096	9,778	9,613
Segments \| North American Limited-Service
Disaggregation of Revenue [Line Items]
Revenues	875	863	2,524	2,440
Segments \| Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	275	263	818	756
Segments \| Other International
Disaggregation of Revenue [Line Items]
Revenues	561	591	1,695	1,691
Unallocated corporate
Disaggregation of Revenue [Line Items]
Revenues	215	265	586	701
Fee revenues
Disaggregation of Revenue [Line Items]
Gross revenues	932	826	2,728	2,433
Contract investment amortization	(13)	(11)	(44)	(34)
Revenues	919	815	2,684	2,399
Fee revenues \| Segments
Disaggregation of Revenue [Line Items]
Gross revenues	805	741	2,372	2,184
Contract investment amortization	(13)	(11)	(44)	(34)
Revenues	792	730	2,328	2,150
Fee revenues \| Segments \| North American Full-Service
Disaggregation of Revenue [Line Items]
Gross revenues	305	285	949	891
Contract investment amortization	(7)	(7)	(25)	(19)
Revenues	298	278	924	872
Fee revenues \| Segments \| North American Limited-Service
Disaggregation of Revenue [Line Items]
Gross revenues	246	232	692	643
Contract investment amortization	(3)	(2)	(9)	(8)
Revenues	243	230	683	635
Fee revenues \| Segments \| Asia Pacific
Disaggregation of Revenue [Line Items]
Gross revenues	119	106	346	301
Contract investment amortization	0	0	(1)	(1)
Revenues	119	106	345	300
Fee revenues \| Segments \| Other International
Disaggregation of Revenue [Line Items]
Gross revenues	135	118	385	349
Contract investment amortization	(3)	(2)	(9)	(6)
Revenues	132	116	376	343
Owned, leased, and other
Disaggregation of Revenue [Line Items]
Revenues	397	433	1,226	1,309
Owned, leased, and other \| Segments
Disaggregation of Revenue [Line Items]
Revenues	382	421	1,178	1,276
Owned, leased, and other \| Segments \| North American Full-Service
Disaggregation of Revenue [Line Items]
Revenues	137	157	432	535
Owned, leased, and other \| Segments \| North American Limited-Service
Disaggregation of Revenue [Line Items]
Revenues	34	37	104	100
Owned, leased, and other \| Segments \| Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	46	48	141	138
Owned, leased, and other \| Segments \| Other International
Disaggregation of Revenue [Line Items]
Revenues	165	179	501	503
Reimbursements
Disaggregation of Revenue [Line Items]
Revenues	3,733	3,830	11,491	11,493
Reimbursements \| Segments
Disaggregation of Revenue [Line Items]
Revenues	3,660	3,662	11,309	11,074
Reimbursements \| Segments \| North American Full-Service
Disaggregation of Revenue [Line Items]
Revenues	2,688	2,661	8,422	8,206
Reimbursements \| Segments \| North American Limited-Service
Disaggregation of Revenue [Line Items]
Revenues	598	596	1,737	1,705
Reimbursements \| Segments \| Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	110	109	332	318
Reimbursements \| Segments \| Other International
Disaggregation of Revenue [Line Items]
Revenues	$ 264	$ 296	$ 818	$ 845

Revenues - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
Revenues - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Capitalized costs	$ 313	$ 295
Contract Balances, Excluding Loyalty Program
Disaggregation of Revenue [Line Items]
Increase (decrease) in contract liabilities	81
Contract balances	766	685
Loyalty Program
Disaggregation of Revenue [Line Items]
Increase (decrease) in contract liabilities	682
Contract balances	5,622	$ 4,940
Revenue recognized	$ 1,315

Acquisitions and Dipositions - Dispositions, Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of equity method investments		$ 42
Gain on sale from equity method investee	$ 55	$ 10
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| The Tremont Chicago Hotel at Magnificent Mile, Le Centre Sheraton Montreal Hotel, Westin Denarau Island Resort, and The Sheraton Fiji Resort
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of property				$ 79
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| The Sheraton Buenos Aires Hotel & Convention Center and Park Tower
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of property			$ 53

Earnings Per Share - Reconciliation of the Earnings (Losses) and Number of Shares Used in Calculations of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Computation of Basic Earnings Per Share
Net income	$ 483	$ 485	$ 1,491	$ 1,345
Shares for basic earnings per share (in shares)	346.7	372.3	352.8	378.5
Basic earnings per share (in USD per share)	$ 1.39	$ 1.30	$ 4.23	$ 3.55
Computation of Diluted Earnings Per Share
Net income	$ 483	$ 485	$ 1,491	$ 1,345
Shares for basic earnings per share (in shares)	346.7	372.3	352.8	378.5
Effect of dilutive securities
Share-based compensation (in shares)	3.9	4.3	4.3	4.7
Shares for diluted earnings per share (in shares)	350.6	376.6	357.1	383.2
Diluted earnings per share (in USD per share)	$ 1.38	$ 1.29	$ 4.18	$ 3.51

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Share-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 47	$ 44	$ 140	$ 139
Deferred compensation costs related to unvested awards	$ 219		$ 219		$ 168
RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, weighted average grant-date fair value (in USD per share)			$ 133
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, granted (in shares)			1.4
Stock awards, vesting period			4 years
Stock awards, period of service after grant date			1 year
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, granted (in shares)			0.1
Stock awards, vesting period			3 years

Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate	14.90%	34.30%	20.10%	31.00%
Cash paid for income taxes, net of refunds			$ 567	$ 413
Change in cash paid for income taxes, net of refunds			154
Provisional estimate of the benefit of the 2017 tax act due to the one-time transition tax			5
Provisional estimate of the impact of the 2017 tax act due to deemed repatriation transition tax			740
Tax expense relating to remitted accumulated earnings of non-U.S. subsidiaries			$ 27

Commitments and Contingencies - Guarantees (Details) $ in Millions	Sep. 30, 2018 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	$ 357
Recorded Liability for Guarantees	129
Debt service
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	129
Recorded Liability for Guarantees	18
Operating profit
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	219
Recorded Liability for Guarantees	109
Other
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	9
Recorded Liability for Guarantees	$ 2

Commitments and Contingencies - Contingent Purchase Obligations (Details) $ in Millions	Sep. 30, 2018 USD ($)
Guarantor Obligations [Line Items]
Guarantee	$ 357
Guarantee, recorded liability	129
Sheraton Grand Chicago Hotel
Guarantor Obligations [Line Items]
Guarantee, recorded liability	57
Sheraton Grand Chicago Hotel \| Hotel and Leasehold
Guarantor Obligations [Line Items]
Guarantee	300
Sheraton Grand Chicago Hotel \| Land
Guarantor Obligations [Line Items]
Guarantee	$ 200

Long-Term Debt (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Credit Facility	$ 0		$ 0
Capital lease obligations	167		171
Total debt	9,327		8,238
Less: Current portion of long-term debt	(617)		(398)
Long-term debt, noncurrent	8,710		7,840
Series K Notes, interest rate of 3.0%, face amount of $600, maturing March 1, 2019 (effective interest rate of 4.4%)
Debt Instrument [Line Items]
Senior notes	599		598
Series L Notes, interest rate of 3.3%, face amount of $350, maturing September 15, 2022 (effective interest rate of 3.4%)
Debt Instrument [Line Items]
Senior notes	349		348
Series M Notes, interest rate of 3.4%, face amount of $350, maturing October 15, 2020 (effective interest rate of 3.6%)
Debt Instrument [Line Items]
Senior notes	348		348
Series N Notes, interest rate of 3.1%, face amount of $400, maturing October 15, 2021 (effective interest rate of 3.4%)
Debt Instrument [Line Items]
Senior notes	397		397
Series O Notes, interest rate of 2.9%, face amount of $450, maturing March 1, 2021 (effective interest rate of 3.1%)
Debt Instrument [Line Items]
Senior notes	448		447
Series P Notes, interest rate of 3.8%, face amount of $350, maturing October 1, 2025 (effective interest rate of 4.0%)
Debt Instrument [Line Items]
Senior notes	345		345
Series Q Notes, interest rate of 2.3%, face amount of $750, maturing January 15, 2022 (effective interest rate of 2.5%)
Debt Instrument [Line Items]
Senior notes	745		744
Series R Notes, interest rate of 3.1%, face amount of $750, maturing June 15, 2026 (effective interest rate of 3.3%)
Debt Instrument [Line Items]
Senior notes	743		743
Series S Notes, interest rate of 6.8%, face amount of $324, matured May 15, 2018 (effective interest rate of 1.7%)
Debt Instrument [Line Items]
Senior notes	0		330
Series T Notes, interest rate of 7.2%, face amount of $181, maturing December 1, 2019 (effective interest rate of 2.3%)
Debt Instrument [Line Items]
Senior notes	190		197
Series U Notes, interest rate of 3.1%, face amount of $291, maturing February 15, 2023 (effective interest rate of 3.1%)
Debt Instrument [Line Items]
Senior notes	291		291
Series V Notes, interest rate of 3.8%, face amount of $318, maturing March 15, 2025 (effective interest rate of 2.8%)
Debt Instrument [Line Items]
Senior notes	335		337
Series W Notes, interest rate of 4.5%, face amount of $278, maturing October 1, 2034 (effective interest rate of 4.1%)
Debt Instrument [Line Items]
Senior notes	292		292
Series X Notes, interest rate of 4.0%, face amount of $450, maturing April 15, 2028 (effective interest rate of 4.2%)
Debt Instrument [Line Items]
Senior notes	$ 443		0
Senior Notes \| Series K Notes, interest rate of 3.0%, face amount of $600, maturing March 1, 2019 (effective interest rate of 4.4%)
Debt Instrument [Line Items]
Interest rate	3.00%
Senior notes, face amount	$ 600
Effective interest rate	4.40%
Senior Notes \| Series L Notes, interest rate of 3.3%, face amount of $350, maturing September 15, 2022 (effective interest rate of 3.4%)
Debt Instrument [Line Items]
Interest rate	3.30%
Senior notes, face amount	$ 350
Effective interest rate	3.40%
Senior Notes \| Series M Notes, interest rate of 3.4%, face amount of $350, maturing October 15, 2020 (effective interest rate of 3.6%)
Debt Instrument [Line Items]
Interest rate	3.40%
Senior notes, face amount	$ 350
Effective interest rate	3.60%
Senior Notes \| Series N Notes, interest rate of 3.1%, face amount of $400, maturing October 15, 2021 (effective interest rate of 3.4%)
Debt Instrument [Line Items]
Interest rate	3.10%
Senior notes, face amount	$ 400
Effective interest rate	3.40%
Senior Notes \| Series O Notes, interest rate of 2.9%, face amount of $450, maturing March 1, 2021 (effective interest rate of 3.1%)
Debt Instrument [Line Items]
Interest rate	2.90%
Senior notes, face amount	$ 450
Effective interest rate	3.10%
Senior Notes \| Series P Notes, interest rate of 3.8%, face amount of $350, maturing October 1, 2025 (effective interest rate of 4.0%)
Debt Instrument [Line Items]
Interest rate	3.80%
Senior notes, face amount	$ 350
Effective interest rate	4.00%
Senior Notes \| Series Q Notes, interest rate of 2.3%, face amount of $750, maturing January 15, 2022 (effective interest rate of 2.5%)
Debt Instrument [Line Items]
Interest rate	2.30%
Senior notes, face amount	$ 750
Effective interest rate	2.50%
Senior Notes \| Series R Notes, interest rate of 3.1%, face amount of $750, maturing June 15, 2026 (effective interest rate of 3.3%)
Debt Instrument [Line Items]
Interest rate	3.10%
Senior notes, face amount	$ 750
Effective interest rate	3.30%
Senior Notes \| Series S Notes, interest rate of 6.8%, face amount of $324, matured May 15, 2018 (effective interest rate of 1.7%)
Debt Instrument [Line Items]
Interest rate	6.80%
Senior notes, face amount	$ 324
Effective interest rate	1.70%
Senior Notes \| Series T Notes, interest rate of 7.2%, face amount of $181, maturing December 1, 2019 (effective interest rate of 2.3%)
Debt Instrument [Line Items]
Interest rate	7.20%
Senior notes, face amount	$ 181
Effective interest rate	2.30%
Senior Notes \| Series U Notes, interest rate of 3.1%, face amount of $291, maturing February 15, 2023 (effective interest rate of 3.1%)
Debt Instrument [Line Items]
Interest rate	3.10%
Senior notes, face amount	$ 291
Effective interest rate	3.10%
Senior Notes \| Series V Notes, interest rate of 3.8%, face amount of $318, maturing March 15, 2025 (effective interest rate of 2.8%)
Debt Instrument [Line Items]
Interest rate	3.80%
Senior notes, face amount	$ 318
Effective interest rate	2.80%
Senior Notes \| Series W Notes, interest rate of 4.5%, face amount of $278, maturing October 1, 2034 (effective interest rate of 4.1%)
Debt Instrument [Line Items]
Interest rate	4.50%
Senior notes, face amount	$ 278
Effective interest rate	4.10%
Senior Notes \| Series X Notes, interest rate of 4.0%, face amount of $450, maturing April 15, 2028 (effective interest rate of 4.2%)
Debt Instrument [Line Items]
Interest rate	4.00%	4.00%
Senior notes, face amount	$ 450	$ 450
Effective interest rate	4.20%
Commercial paper
Debt Instrument [Line Items]
Commercial paper	$ 3,419		2,371
Other
Debt Instrument [Line Items]
Other	$ 216		$ 279

Long-Term Debt - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017
Debt Disclosure [Abstract]
Interest paid, net of amounts capitalized		$ 204	$ 171
Maximum borrowing capacity under credit facility		4,000
Senior Notes \| Series X Notes, interest rate of 4.0%, face amount of $450, maturing April 15, 2028 (effective interest rate of 4.2%)
Debt Instrument [Line Items]
Senior notes, face amount	$ 450	$ 450
Interest rate	4.00%	4.00%
Proceeds from debt offering	$ 443

Fair Value of Financial Instruments - Carrying Values and Fair Values of Non-Current Financial Assets and Liabilities (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior, mezzanine, and other loans	$ 122	$ 142
Other noncurrent liabilities	(2,248)	(2,610)
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior, mezzanine, and other loans	122	142
Total noncurrent financial assets	122	142
Senior Notes	(4,926)	(5,087)
Commercial paper	(3,419)	(2,371)
Other long-term debt	(204)	(217)
Other noncurrent liabilities	(158)	(178)
Total noncurrent financial liabilities	(8,707)	(7,853)
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior, mezzanine, and other loans	112	130
Total noncurrent financial assets	112	130
Senior Notes	(4,814)	(5,126)
Commercial paper	(3,419)	(2,371)
Other long-term debt	(204)	(221)
Other noncurrent liabilities	(158)	(178)
Total noncurrent financial liabilities	$ (8,595)	$ (7,896)

Accumulated Other Comprehensive Loss and Shareholders' Equity - Accumulated Other Comprehensive (Loss) Income Activity (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			$ 3,731
Other comprehensive income (loss) before reclassifications			(306)	$ 443
Amounts reclassified from accumulated other comprehensive loss			18	5
Net other comprehensive (loss) income	$ (65)	$ 107	(288)	448
Balance at end of period	2,324		2,324
Other comprehensive income (loss) before reclassification related to foreign current translation adjustment, loss on intra-equity foreign currency transaction			27	(142)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			(23)	(503)
Other comprehensive income (loss) before reclassifications			(313)	457
Amounts reclassified from accumulated other comprehensive loss			10	0
Net other comprehensive (loss) income			(303)	457
Balance at end of period	(326)	(46)	(326)	(46)
Derivative Instrument Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			(10)	(5)
Other comprehensive income (loss) before reclassifications			7	(13)
Amounts reclassified from accumulated other comprehensive loss			8	5
Net other comprehensive (loss) income			15	(8)
Balance at end of period	5	(13)	5	(13)
Available-For-Sale Securities Unrealized Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			4	6
Other comprehensive income (loss) before reclassifications			0	(1)
Amounts reclassified from accumulated other comprehensive loss			0	0
Net other comprehensive (loss) income			0	(1)
Balance at end of period	0	5	0	5
Pension and Postretirement Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			12	5
Other comprehensive income (loss) before reclassifications			0	0
Amounts reclassified from accumulated other comprehensive loss			0	0
Net other comprehensive (loss) income			0	0
Balance at end of period	12	5	12	5
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			(17)	(497)
Net other comprehensive (loss) income			(288)
Balance at end of period	$ (309)	$ (49)	$ (309)	$ (49)
Adoption of ASU 2016-01
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment of accounting principle					$ 0
Adoption of ASU 2016-01 \| Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment of accounting principle					0
Adoption of ASU 2016-01 \| Derivative Instrument Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment of accounting principle					0
Adoption of ASU 2016-01 \| Available-For-Sale Securities Unrealized Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment of accounting principle					(4)
Adoption of ASU 2016-01 \| Pension and Postretirement Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment of accounting principle					0
Adoption of ASU 2016-01 \| Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative effect adjustment of accounting principle					$ (4)

Accumulated Other Comprehensive Loss and Shareholders' Equity - Changes in Shareholders' Equity (Deficit) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018	Dec. 31, 2017	Jan. 01, 2016
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Balance at beginning of period			$ 3,731
Balance at beginning of period (in shares)			359.1
Balance at beginning of period (as adjusted)	$ 2,324		$ 2,324			$ 3,582
Net income	483	$ 485	1,491	$ 1,345
Other comprehensive loss	(65)	107	(288)	448
Dividends ($1.15 per share)			(404)
Share-based compensation plans			$ 44
Share-based compensation plans (in shares)			1.4
Purchase of treasury stock			$ (2,473)
Purchase of treasury stock (in shares)			(18.5)
Balance at end of period	$ 2,324		$ 2,324
Balance at end of period (in shares)	342.0		342.0
Cash dividends (in USD per share)			$ 1.15
Class A Common Stock
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Balance at beginning of period			$ 5
Balance at beginning of period (as adjusted)						5
Balance at end of period	$ 5		5
Additional Paid-in- Capital
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Balance at beginning of period			5,770
Balance at beginning of period (as adjusted)						5,770
Share-based compensation plans			3
Balance at end of period	5,773		5,773
Retained Earnings
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Balance at beginning of period			7,391
Balance at beginning of period (as adjusted)						7,242
Net income			1,491
Dividends ($1.15 per share)			(404)
Balance at end of period	8,705		8,705
Treasury Stock, at Cost
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Balance at beginning of period			(9,418)
Balance at beginning of period (as adjusted)						(9,418)
Share-based compensation plans			41
Purchase of treasury stock			(2,473)
Balance at end of period	(11,850)		(11,850)
Accumulated Other Comprehensive Loss
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Balance at beginning of period			(17)	(497)
Balance at beginning of period (as adjusted)						(17)
Other comprehensive loss			(288)
Balance at end of period	$ (309)	$ (49)	$ (309)	$ (49)
Adoption of ASU 2014-09
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU						(149)
Adoption of ASU 2014-09 \| Retained Earnings
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU						(149)	$ 264
Adoption of ASU 2014-09 \| Accumulated Other Comprehensive Loss
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU						$ 0
Adoption of ASU 2016-01
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU					$ 0
Adoption of ASU 2016-01 \| Retained Earnings
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU					4
Adoption of ASU 2016-01 \| Accumulated Other Comprehensive Loss
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU					(4)
Adoption of ASU 2016-16
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU					372
Adoption of ASU 2016-16 \| Retained Earnings
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU					$ 372

Business Segments - Segment Revenues (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 5,049	$ 5,078	$ 15,401	$ 15,201
Total segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	4,834	4,813	14,815	14,500
Other unallocated corporate
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	215	265	586	701
North American Full-Service \| Total segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	3,123	3,096	9,778	9,613
North American Limited-Service \| Total segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	875	863	2,524	2,440
Asia Pacific \| Total segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	275	263	818	756
Other International \| Total segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 561	$ 591	$ 1,695	$ 1,691

Business Segments - Segment Profits (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment profits	$ 570	$ 790	$ 1,810	$ 2,080
Interest expense, net of interest income	(81)	(63)	(230)	(191)
Income taxes	(85)	(253)	(375)	(603)
NET INCOME	483	485	1,491	1,345
Total segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment profits	736	783	2,412	2,288
Other unallocated corporate
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment profits	(87)	18	(316)	(149)
North American Full-Service \| Total segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment profits	248	295	919	972
North American Limited-Service \| Total segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment profits	206	255	640	685
Asia Pacific \| Total segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment profits	106	93	358	260
Other International \| Total segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment profits	$ 176	$ 140	$ 495	$ 371

Acquisitions and Dipositions - Acquisitions (Details) $ in Millions	3 Months Ended
	Jun. 30, 2018 USD ($)
Sheraton Grand Phoenix
Business Acquisition [Line Items]
Acquisition price	$ 255