Leases [Abstract] LEASES Lessee, Finance Leases [Text Block] LEASES Lessee, Operating Leases [Text Block] Quarterly Financial Information Disclosure [Abstract] Revenues Revenues Operating income Operating Income (Loss) Net income Net Income (Loss) Attributable to Parent Basic earnings per share (in USD per share) Earnings Per Share, Basic Diluted earnings per share (in USD per share) Earnings Per Share, Diluted Debt Disclosure [Abstract] Long-Term Debt Schedule of Long-term Debt Instruments [Table Text Block] Future Principal Payments for Debt Schedule of Maturities of Long-term Debt [Table Text Block] Earnings Per Share [Abstract] Reconciliation of the Earnings (Losses) and Number of Shares Used in Calculations of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Operating Leases Lessee, Operating Lease, Liability, Payment, Due [Abstract] 2020 Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 2021 Lessee, Operating Lease, Liability, Payments, Due Year Two 2022 Lessee, Operating Lease, Liability, Payments, Due Year Three 2023 Lessee, Operating Lease, Liability, Payments, Due Year Four 2024 Lessee, Operating Lease, Liability, Payments, Due Year Five Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Total minimum lease payments Lessee, Operating Lease, Liability, Payments, Due Less: Amount representing interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Present value of minimum lease payments Operating Lease, Liability Current Operating Lease, Liability, Current Noncurrent Operating Lease, Liability, Noncurrent Finance Leases Finance Lease, Liability, Payment, Due [Abstract] 2020 Finance Lease, Liability, Payments, Remainder of Fiscal Year 2021 Finance Lease, Liability, Payments, Due Year Two 2022 Finance Lease, Liability, Payments, Due Year Three 2023 Finance Lease, Liability, Payments, Due Year Four 2024 Finance Lease, Liability, Payments, Due Year Five Thereafter Finance Lease, Liability, Payments, Due after Year Five Total minimum lease payments Finance Lease, Liability, Payment, Due Less: Amount representing interest Finance Lease, Liability, Undiscounted Excess Amount Present value of minimum lease payments Finance Lease, Liability Current Finance Lease, Liability, Current Noncurrent Finance Lease, Liability, Noncurrent Income Tax Disclosure [Abstract] U.S. statutory tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent U.S. state income taxes, net of U.S. federal tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Non-U.S. income Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Change in uncertain tax positions Effective Income Tax Rate Reconciliation, Change in Uncertain Tax Positions, Percent Effective Income Tax Rate Reconciliation, Change in Uncertain Tax Positions, Percent Change in U.S. tax rate Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Transition Tax on foreign earnings Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent Tax on asset dispositions Effective Income Tax Rate Reconciliation, Disposition of Asset, Percent Excess tax benefits related to equity awards Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Percent Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective rate Effective Income Tax Rate Reconciliation, Percent Income Statement [Abstract] Statement [Table] Statement [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Base management fees Management Service, Base [Member] Franchise fees Franchise [Member] Incentive management fees Management Service, Incentive [Member] Net fee revenues Fee Service [Member] Fee Service [Member] Owned, leased, and other Owned, Leased and Other [Member] Owned, Leased and Other [Member] Reimbursements Reimbursements [Member] Reimbursements [Member] Statement [Line Items] Statement [Line Items] REVENUES Revenues [Abstract] Gross fee revenues Revenues, Gross of Capitalized Contract Cost, Amortization Revenues, Gross of Capitalized Contract Cost, Amortization Contract investment amortization Capitalized Contract Cost, Amortization Total revenue OPERATING COSTS AND EXPENSES Costs and Expenses [Abstract] Cost of revenues Cost of Revenue Depreciation, amortization, and other Depreciation, Amortization and Other, Excluding Capitalized Contract Cost Amortization Depreciation, Amortization and Other, Excluding Capitalized Contract Cost Amortization General, administrative, and other General and Administrative Expense Merger-related costs and charges Business Combination, Acquisition And Integration Related Costs Business Combination, Acquisition and Integration Related Costs Costs and Expenses, Total Costs and Expenses OPERATING INCOME Gains and other income, net Other Nonoperating Income (Expense) Interest expense (1) Interest Expense Interest income Investment Income, Interest Equity in earnings Income (Loss) from Equity Method Investments INCOME BEFORE INCOME TAXES Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Provision for income taxes Income Tax Expense (Benefit) NET INCOME EARNINGS PER SHARE Earnings Per Share, Basic [Abstract] Earnings per share - basic (in USD per share) Earnings per share - diluted (in USD per share) U.S. Income (Loss) from Continuing Operations before Income Taxes, Domestic Non-U.S. Income (Loss) from Continuing Operations before Income Taxes, Foreign Share-based Payment Arrangement [Abstract] SHARE-BASED COMPENSATION Share-based Payment Arrangement [Text Block] Operating lease cost Operating Lease, Cost Variable lease cost Variable Lease, Cost Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Unrecognized tax benefit at beginning of year Unrecognized Tax Benefits Change attributable to tax positions taken in prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Change attributable to tax positions taken in prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Change attributable to tax positions taken during the current period Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Decrease attributable to settlements with taxing authorities Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Decrease attributable to lapse of statute of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Unrecognized tax benefit at end of year Income Tax Contingency [Table] Income Tax Contingency [Table] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] International Non-US [Member] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] State State and Local Jurisdiction [Member] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Domain] Income Tax Authority, Name [Domain] Switzerland, Singapore, and Luxembourg Swiss Federal Tax Administration, Inland Revenue Authority of Singapore, and Luxembourg Inland Revenue [Member] Swiss Federal Tax Administration, Inland Revenue Authority of Singapore, and Luxembourg Inland Revenue [Member] United States Internal Revenue Service (IRS) [Member] Nature of Uncertainty [Axis] Nature of Uncertainty [Axis] Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Nature of Uncertainty [Domain] Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Nature of Uncertainty [Domain] U.S. Issues Currently in Appeals Issues in Appeals [Member] Issues in Appeals [Member] State and Non-U.S. Audits Expected to be Resolved in 2020 Issues Expected to Resolve in Next Twelve Months [Member] Issues Expected to Resolve in Next Twelve Months [Member] Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Unrecognized tax benefits that, if recognized, would impact the effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Amount of unrecognized tax benefits that is reasonably possible will be reversed in next twelve months Decrease in Unrecognized Tax Benefits is Reasonably Possible Interest related to unrecognized tax benefits Unrecognized Tax Benefits, Interest on Income Taxes Expense Tax credits which expire Deferred Tax Assets, Tax Credit Carryforwards, Not Subject To Expiration Deferred Tax Assets, Tax Credit Carryforwards, Not Subject To Expiration Tax credits which do not expire Deferred Tax Assets, Tax Credit Carryforwards, Subject To Expiration Deferred Tax Assets, Tax Credit Carryforwards, Subject To Expiration Net operating loss benefits Operating Loss Carryforwards Taxable Income Reduction The sum of domestic, foreign and state and local operating loss carryforwards used to reduce taxable income under enacted tax laws. Net operating losses Operating Loss Carryforwards Net operating losses subject to expiration Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration Income tax benefit from non-U.S. income Pre-tax income Income tax expense (benefit) Cash paid for income taxes Income Taxes Paid, Net 2017 Tax Act, provisional income tax expense (benefit) Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit) Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit) 2017 Tax Act, transition tax expense (benefit) Tax Cuts and Jobs Act, Transition Tax, Income Tax Expense (Benefit) Tax Cuts and Jobs Act, Transition Tax, Income Tax Expense (Benefit) 2017 Tax Act, income tax expense (benefit) Tax Cuts and Jobs Act, Income Tax Expense (Benefit) Charge for unremitted foreign earnings Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount Segment Reporting [Abstract] BUSINESS SEGMENTS Segment Reporting Disclosure [Text Block] Earnings Per Share Earnings Per Share [Text Block] Statement of Cash Flows [Abstract] Guest loyalty program Loyalty Program [Member] Loyalty Program [Member] OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile to cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation, amortization, and other Depreciation, Amortization And Other Depreciation, Amortization And Other Share-based compensation Share-based Payment Arrangement, Noncash Expense Income taxes Noncash Income Tax Expense The non-cash component of income tax expense, less the tax benefit from exercise of stock options. Liability for guest loyalty program Increase (Decrease) in Contract with Customer, Liability, Cash Increase (Decrease) in Contract with Customer, Liability, Cash Contract acquisition costs Increase (Decrease) in Capitalized Contract Costs, Net Increase (Decrease) in Capitalized Contract Costs, Net Merger-related charges Noncash Merger Related Costs Working capital changes Increase (Decrease) In Working Capital Increase (Decrease) In Working Capital Gain on asset dispositions Gain (Loss) on Disposition of Assets Other Other Operating Activities, Cash Flow Statement Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] Capital expenditures Payments to Acquire Property, Plant, and Equipment Dispositions Proceeds from Sale of Property, Plant, and Equipment Loan advances Payments for Loan Advances The cash outflow from advancing money to others in the form of loans. Loan collections Proceeds from Sale and Collection of Notes Receivable Other Payments for (Proceeds from) Other Investing Activities Net cash (used in) provided by investing activities Net Cash Provided by (Used in) Investing Activities FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] Commercial paper/Credit Facility, net Proceeds From Repayments Of Commercial Paper And Long Term Lines Of Credit The net cash inflow (outflow) from issuing (borrowing) and repaying commercial paper or line of credit having initial term of repayment greater than one year or the normal operating cycle, if longer. Issuance of long-term debt Proceeds from Issuance of Long-term Debt Repayment of long-term debt Repayments of Long-term Debt Issuance of Class A Common Stock Proceeds from Issuance of Common Stock Dividends paid Payments of Ordinary Dividends, Common Stock Purchase of treasury stock Payments for Repurchase of Common Stock Share-based compensation withholding taxes Payment, Tax Withholding, Share-based Payment Arrangement Other Proceeds from (Payments for) Other Financing Activities Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period Restricted cash Restricted Cash Receivables [Abstract] NOTES RECEIVABLE Financing Receivables [Text Block] Related Party Transactions [Abstract] RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Disclosure [Table] Commitments and Contingencies Disclosure [Table] Commitments and Contingencies Disclosure [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Accrued Expenses and Other Other Current Liabilities [Member] Other noncurrent liabilities Other Noncurrent Liabilities [Member] Loss Contingencies By Secondary Nature Of Contingency Loss Contingencies By Secondary Nature Of Contingency [Axis] Loss Contingencies by Secondary Nature of Contingency Loss Contingencies by Secondary Nature of Contingency [Domain] Loss Contingencies by Secondary Nature of Contingency [Domain] Loss Contingencies by Secondary Nature of Contingency [Domain] Not Yet In Effect Condition Not Yet In Effect Condition [Member] Not Yet in Effect Condition Name of Property [Axis] Name of Property [Axis] Name of Property [Domain] Name of Property [Domain] Sheraton Grand Chicago Hotel Sheraton Grand Chicago Hotel [Member] Sheraton Grand Chicago Hotel [Member] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Land and Hotel Building and Land Leasehold [Member] Building and Land Leasehold Land Land [Member] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Debt service Guarantee of Indebtedness of Others [Member] Operating profit Guarantee Operating Profit [Member] Guarantee, Operating Profit Other Guarantee Type, Other [Member] Commitments and Contingencies Disclosure [Line Items] Commitments and Contingencies Disclosure [Line Items] Commitments and Contingencies Disclosure [Line Items] Guarantee obligations, term Guarantee Obligation, Term Guarantee Obligation, Term Maximum Potential Amount of Future Fundings Guarantor Obligations, Maximum Exposure, Undiscounted Recorded Liability for Guarantees Guarantor Obligations, Current Carrying Value Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Equity Method Investment Equity Method Investee [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Total revenue Depreciation, amortization, and other General, administrative, and other Reimbursed expenses Gains and other income, net Interest expense Cover page. Entities [Table] Entities [Table] Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] Exchange [Domain] Exchange [Domain] Nasdaq Global Select Market NASDAQ/NGS (GLOBAL SELECT MARKET) [Member] Chicago Stock Exchange CHICAGO STOCK EXCHANGE, INC [Member] Entity Information [Line Items] Entity Information [Line Items] Document Type Document Type Document Annual Report Document Annual Report Document Period End Date Document Period End Date Document Transition Report Document Transition Report Entity File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Title of 12(b) Security Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Statement of Comprehensive Income [Abstract] Net income Other comprehensive (loss) income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Derivative instrument adjustments and other, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Reclassification of (gains) losses, net of tax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Total other comprehensive (loss) income, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Total segment Operating Segments [Member] Unallocated corporate Corporate, Non-Segment [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] North American Full-Service North American Full Service Segment [Member] North American Full Service Segment North American Limited-Service North American Limited Service Segment [Member] North American Limited Service Segment Asia Pacific Asia Pacific Segment [Member] Asia Pacific Segment [Member] Other International Other International Segments [Member] Other International Segments [Member] Segment Reporting Information [Line Items] Capital expenditures SUPPLEMENTARY DATA QUARTERLY FINANCIAL DATA - UNAUDITED Quarterly Financial Information [Text Block] Notes Receivable Expected Future Principal Payments Schedule of Financing Receivables, Minimum Payments [Table Text Block] Business Combinations [Abstract] ACQUISITIONS AND DISPOSITIONS Mergers, Acquisitions and Dispositions Disclosures [Text Block] Computation of Basic Earnings Per Share Shares for basic earnings per share (in shares) Weighted Average Number of Shares Outstanding, Basic Computation of Diluted Earnings Per Share Earnings Per Share, Diluted [Abstract] Effect of dilutive securities Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] Share-based compensation (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Shares for diluted earnings per share (in shares) Weighted Average Number of Shares Outstanding, Diluted Reconciliation of Revenue from Segments to Consolidated [Table] Reconciliation of Revenue from Segments to Consolidated [Table] International Operations International Operations [Member] International Operations Segment Reporting, Revenue Reconciling Item [Line Items] Segment Reporting, Revenue Reconciling Item [Line Items] Fair Value Disclosures [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Short-term Debt, Type Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Commercial paper Commercial Paper [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Commercial paper, maturity term Debt Instrument, Term Accounting Policies [Abstract] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Revenue Revenue from Contract with Customer [Policy Text Block] Real Estate Sales Real Estate, Policy [Policy Text Block] Retirement Savings Plan Defined Contribution Plan, Policy [Policy Text Block] Defined Contribution Plan, Policy [Policy Text Block] Non-U.S. Operations Foreign Currency Transactions and Translations Policy [Policy Text Block] Share-Based Compensation Share-based Payment Arrangement [Policy Text Block] Advertising Costs Advertising Cost [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Cash and Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Accounts Receivable Accounts Receivable [Policy Text Block] Assets Held for Sale Assets Held for Sale [Policy Text Block] Assets Held for Sale, Policy Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Intangibles and Long-Lived Assets Valuation of Intangibles and Long Lived Assets [Policy Text Block] Valuation of Intangibles and Long Lived Assets Investments Investment, Policy [Policy Text Block] Fair Value Measurements Fair Value of Financial Instruments, Policy [Policy Text Block] Derivative Instruments Derivatives, Policy [Policy Text Block] Loan Loss Reserves Financing Receivable [Policy Text Block] Leases Lessee, Leases [Policy Text Block] Guarantees Minimum Guarantees, Policy [Policy Text Block] Self-Insurance Programs Self Insurance [Policy Text Block] Disclosure related to self insurance policy. Pension and Other Postretirement Benefits Pension and Other Postretirement Plans, Policy [Policy Text Block] Legal Contingencies Commitments and Contingencies, Policy [Policy Text Block] Business Combinations Business Combinations Policy [Policy Text Block] Asset Acquisitions Asset Acquisitions, Policy [Policy Text Block] Asset Acquisitions, Policy [Policy Text Block] New Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Intangible Assets Intangible Assets, Finite-Lived, Policy [Policy Text Block] Property and Equipment, Capitalization and Useful Lives Property, Plant and Equipment, Policy [Policy Text Block] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Asia Pacific Asia [Member] Europe Europe [Member] Caribbean and Latin America Caribbean and Latin America [Member] Caribbean and Latin America [Member] Middle East And Africa Middle East And Africa [Member] Middle East And Africa Other Locations Other Locations [Member] Other Locations [Member] Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Total segments profits Interest expense, net of interest income Interest Revenue (Expense), Net Income taxes Investment in impaired loans Impaired Financing Receivable, Recorded Investment Allowance for credit losses Financing Receivable, Allowance for Credit Loss Investment in impaired loans with no related allowance for credit losses Impaired Financing Receivable, with No Related Allowance, Recorded Investment Average investment in impaired loans Impaired Financing Receivable, Average Recorded Investment LONG-TERM DEBT Long-term Debt [Text Block] FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value Disclosures [Text Block] Assets (primarily composed of hotel real estate managed by us) Equity Method Investment, Summarized Financial Information, Assets Liabilities Equity Method Investment, Summarized Financial Information, Liabilities Equity [Abstract] ACCUMULATED OTHER COMPREHENSIVE LOSS Stockholders' Equity Note Disclosure [Text Block] Reconciliation of Restricted Stock Activity [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type Award Type [Axis] Award Type [Domain] RSUs Restricted Stock Units (RSUs) [Member] Reconciliation of Restricted Stock Activity [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based compensation expense (in millions) Share-based Payment Arrangement, Expense Weighted average grant-date fair value (in USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Aggregate intrinsic value of distributed RSUs (in millions) Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Converted and Distributed, Intrinsic Value Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Converted and Distributed, Intrinsic Value Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] Sales Equity Method Investment, Summarized Financial Information, Revenue Net income Equity Method Investment, Summarized Financial Information, Net Income (Loss) Segment Revenues Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Segment Profits Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Depreciation and Amortization Reconciliation Of Depreciation and Amortization from Segments to Consolidated [Table Text Block] Reconciliation of Depreciation and Amortization from Segments to Consolidated [Table Text Block] Capital Expenditures Reconciliation Of Capitalized Expenditures from Segment to Consolidated [Table Text Block] Reconciliation of Capitalized Expenditures from Segment to Consolidated Goodwill and Intangible Assets Disclosure [Abstract] INTANGIBLE ASSETS AND GOODWILL Goodwill and Intangible Assets Disclosure [Text Block] Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Reimbursed Expenses Reimbursed Costs [Member] Reimbursed Costs [Member] Segment, Geographical Property, Plant and Equipment [Line Items] Estimated useful lives Property, Plant and Equipment, Useful Life Depreciation expense Depreciation Property and equipment, net Property, Plant and Equipment, Net Significant Accounting Policies [Table] Significant Accounting Policies [Table] Significant Accounting Policies [Table] Capitalized Contract Cost [Axis] Capitalized Contract Cost [Axis] Capitalized Contract Cost [Domain] Capitalized Contract Cost [Domain] Costs Incurred to Fulfill Contracts Costs Incurred to Fulfill Contracts [Member] Costs Incurred to Fulfill Contracts [Member] Deferred revenue Contract Services, Excluding Loyalty Program [Member] Contract Services, Excluding Loyalty Program [Member] Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Change in customer contract liability Increase (Decrease) in Contract with Customer, Liability Customer contract liability Contract with Customer, Liability Revenue recognized from customer contract liability Contract with Customer, Liability, Revenue Recognized Change in customer contract liability from change in estimates Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price Change in customer contract liability from change in estimates, net of tax Contract with Customer, Liability, Cumulative Catch-Up Adjustments to Revenue, Change in Estimate of Transaction Price, Net of Tax Contract with Customer, Liability, Cumulative Catch-Up Adjustments to Revenue, Change in Estimate of Transaction Price, Net of Tax Capitalized costs Capitalized Contract Cost, Net Compensation costs from retirement savings plan Defined Contribution Plan, Cost Advertising costs Advertising Expense Normal collection period for accounts receivable Accounts Receivable, Collection Period Accounts Receivable, Collection Period Accounts receivable reserve Accounts Receivable, Allowance for Credit Loss, Current Goodwill impairment charge Goodwill, Impairment Loss Discount rate Self Insurance Projected Settlement Discount Rate Self Insurance Projected Settlement Discount Rate Self-insurance reserve, current Self Insurance Reserve, Current Self-insurance reserve, noncurrent Self Insurance Reserve, Noncurrent Operating lease assets Operating Lease, Right-of-Use Asset Operating lease liability 2020 Notes Receivable, Future Principal Payments Receivable, Current Notes Receivable, Future Principal Payments Receivable, Current 2021 Notes Receivable, Future Principal Payments Receivable, In Two Years Notes Receivable, Future Principal Payments Receivable, in Two Years 2022 Notes Receivable, Future Principal Payments Receivable, In Three Years Notes Receivable, Future Principal Payments Receivable, in Three Years 2023 Notes Receivable, Future Principal Payments Receivable, In Four Years Notes Receivable, Future Principal Payments Receivable, in Four Years 2024 Notes Receivable, Future Principal Payments Receivable, In Five Years Notes Receivable, Future Principal Payments Receivable, in Five Years Thereafter Notes Receivable, Future Principal Payments Receivable, After Year Five Notes Receivable, Future Principal Payments Receivable, After Year Five Senior, mezzanine, and other loans Financing Receivable, after Allowance for Credit Loss Weighted average interest rate at year-end 2019 Notes Receivable Weighted Average Interest Rate Weighted average interest rate for total notes receivable as of the balance sheet date indicated. Range of stated interest rates at year-end 2018, minimum Notes Receivable Interest Rate, Stated Percentage Rate Range, Minimum Lower limit of range of stated interest rates for total notes receivable as of the balance sheet date indicated. Range of stated interest rates at year-end 2018, maximum Notes Receivable Interest Rate, Stated Percentage Rate Range, Maximum Upper limit of range of stated interest rates for total notes receivable as of the balance sheet date indicated. 2020 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2021 Long-term Debt, Maturities, Repayments of Principal in Year Two 2022 Long-term Debt, Maturities, Repayments of Principal in Year Three 2023 Long-term Debt, Maturities, Repayments of Principal in Year Four 2024 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Long-term debt Debt and Lease Obligation INCOME TAXES Income Tax Disclosure [Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Domain] PSUs Performance-Based Restricted Stock Units (RSUs) [Member] Performance-Based Restricted Stock Units (RSUs) [Member] Title of Individual Title of Individual [Axis] Title of Individual [Domain] Title of Individual [Domain] Certain Executive Officers Executive Officer [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Period of service after grant date Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period Deferred compensation costs Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Weighted average remaining term for grants outstanding Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms Shares reserved under the stock plan (in shares) Common Stock, Capital Shares Reserved for Future Issuance Schedule of Finite-Lived Intangible Assets by Major Class [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Contracts acquired in business combinations and other Contract-Based Intangible Assets [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Range of amortization life of intangible assets Finite-Lived Intangible Asset, Useful Life Amortization expense of intangible assets Amortization of Intangible Assets Expected aggregate future amortization expense of intangible assets for 2020 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Expected aggregate future amortization expense of intangible assets for 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Two Expected aggregate future amortization expense of intangible assets for 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Three Expected aggregate future amortization expense of intangible assets for 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Four Expected aggregate future amortization expense of intangible assets for 2024 Finite-Lived Intangible Assets, Amortization Expense, Year Five Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Costs incurred to obtain contracts with customers Costs Incurred to Obtain Contracts [Member] Costs Incurred to Obtain Contracts [Member] Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Definite-lived Intangible Assets, gross Finite-Lived Intangible Assets, Gross Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Definite-lived Intangible Assets, net Finite-Lived Intangible Assets, Net Schedule of Acquired Indefinite-lived Intangible Assets by Major Class [Table] Schedule of Acquired Indefinite-lived Intangible Assets by Major Class [Table] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Brand Assets Trademarks and Trade Names [Member] Acquired Indefinite-lived Intangible Assets [Line Items] Acquired Indefinite-lived Intangible Assets [Line Items] Indefinite-lived Intangible Brand Assets Indefinite-lived Intangible Assets (Excluding Goodwill) Total Intangible Assets Intangible Assets, Net (Excluding Goodwill) Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment by Type Buildings and leasehold improvements Building and Leasehold Improvements [Member] Building and Leasehold Improvements [Member] Furniture and equipment Furniture and Fixtures [Member] Construction in progress Construction in Progress [Member] Property, Plant and Equipment [Line Items] Property and equipment, gross Property, Plant and Equipment, Gross Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and equipment, net Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] Putative Class Action Lawsuits Related to Data Security Incident Putative Class Action Lawsuits Related to Data Security Incident [Member] Putative Class Action Lawsuits Related to Data Security Incident [Member] Shareholder Derivative Complaints Related to Data Security Incident Shareholder Derivative Complaints Related to Data Security Incident [Member] Shareholder Derivative Complaints Related to Data Security Incident [Member] Canadian Putative Class Action Lawsuits Related to Data Security Incident Canadian Putative Class Action Lawsuits Related to Data Security Incident [Member] Canadian Putative Class Action Lawsuits Related to Data Security Incident [Member] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Data Security Incident Data Security Incident [Member] Data Security Incident [Member] Data Security Incident, UK Information Commissioner's Office Data Security Incident, UK Information Commissioner's Office [Member] Data Security Incident, UK Information Commissioner's Office [Member] Right or Obligation to Invest [Axis] Right or Obligation to Invest [Axis] Right or Obligation to Invest [Axis] Right or Obligation to Invest [Domain] Right or Obligation to Invest [Domain] Right or Obligation to Invest [Domain] Information Technology Hardware, Software, Accounting, Finance, and Maintenance Services Information Technology Hardware, Software, Accounting, Finance, and Maintenance Services [Member] Information Technology Hardware, Software, Accounting, Finance, and Maintenance Services [Member] Purchase obligation Purchase Obligation Purchase obligation, expected to fund commitments in 2020 Purchase Obligation, Due in Next Twelve Months Purchase obligation, expected to fund commitments in 2021 Purchase Obligation, Due in Second Year Purchase obligation, expected to fund commitments in 2022 Purchase Obligation, Due in Third Year Letters of credit outstanding Letters of Credit Outstanding, Amount Surety bonds issued Surety Bonds Amount of surety bonds issued as of the balance sheet date. Expense related to data security incident Loss Contingency, Loss in Period Insurance recoveries Insurance Recoveries Proceeds from insurance recoveries Proceeds from Insurance Recoveries Proceeds from Insurance Recoveries Number of lawsuits filed Loss Contingency, Pending Claims, Number Number of new lawsuits filed Loss Contingency, New Claims Filed, Number Number of provinces where cases are pending Loss Contingency, Domicile of Litigation, Number of States or Provinces Loss Contingency, Domicile of Litigation, Number of States or Provinces Estimated fine Loss Contingency, Estimate of Possible Loss Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Asset Acquisition [Axis] Asset Acquisition [Axis] Asset Acquisition [Axis] Asset Acquisition [Domain] Asset Acquisition [Domain] [Domain] for Asset Acquisition [Axis] Sheraton Grand Phoenix Sheraton Grand Phoenix [Member] Sheraton Grand Phoenix [Member] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Disposal Group, Held-for-sale, Not Discontinued Operations Disposal Group, Held-for-sale, Not Discontinued Operations [Member] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] St.Regis New York and The Sheraton Gateway Hotel St.Regis New York and The Sheraton Gateway Hotel [Member] St.Regis New York and The Sheraton Gateway Hotel [Member] The Tremont Chicago Hotel at Magnificent Mile and Le Centre Sheraton Montreal Hotel The Tremont Chicago Hotel at Magnificent Mile and Le Centre Sheraton Montreal Hotel [Member] The Tremont Chicago Hotel at Magnificent Mile and Le Centre Sheraton Montreal Hotel [Member] The Westin Denarau Island Resort and The Sheraton Fiji Resort The Westin Denarau Island Resort and The Sheraton Fiji Resort [Member] The Westin Denarau Island Resort and The Sheraton Fiji Resort [Member] The Sheraton Buenos Aires Hotel & Convention Center and Park Tower and A Luxury Collection Hotel, Buenos Aires The Sheraton Buenos Aires Hotel & Convention Center and Park Tower and A Luxury Collection Hotel, Buenos Aires [Member] The Sheraton Buenos Aires Hotel & Convention Center and Park Tower and A Luxury Collection Hotel, Buenos Aires [Member] JW Marriott Mexico City JW Marriott Mexico City [Member] JW Marriott Mexico City [Member] Ritz Carlton Toronto Ritz Carlton Toronto [Member] Ritz Carlton Toronto [Member] Charlotte Marriott City Center Charlotte Marriott City Center [Member] Charlotte Marriott City Center [Member] Avendra LLC Avendra LLC [Member] Avendra LLC [Member] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Gain on disposal Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Number of properties disposed Disposal Group, Including Discontinued Operation, Number of Properties Disposed Disposal Group, Including Discontinued Operation, Number of Properties Disposed Number of equity method investments disposed Equity Method Investment, Number of Investments Disposed Equity Method Investment, Number of Investments Disposed Gain on disposal of equity method investment Equity Method Investment, Realized Gain (Loss) on Disposal Gain on disposal from equity method investee Income (Loss) From Equity Method Investment, Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Income (Loss) From Equity Method Investment, Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Ownership percentage Disposal Group, Including Discontinued Operation, Percentage Ownership Disposal Group, Including Discontinued Operation, Percentage Ownership Gain on disposal, net of tax Disposal Group, Not Discontinued Operations, Gain (Loss) on Disposal, Net of Tax Disposal Group, Not Discontinued Operations, Gain (Loss) on Disposal, Net of Tax Spending from sales proceeds Disposal Group, Including Discontinued Operations, Expenses Paid From Proceeds Disposal Group, Including Discontinued Operations, Expenses Paid From Proceeds Spending from sales proceeds,net of tax Disposal Group, Including Discontinued Operations, Expenses Paid From Proceeds, Net of Tax Disposal Group, Including Discontinued Operations, Expenses Paid From Proceeds, Net of Tax Procurement services term Disposal Group, Including Discontinued Operations, Procurement Contract Term Disposal Group, Including Discontinued Operations, Procurement Contract Term Consideration for property acquired Asset Acquisition, Consideration Transferred Asset Acquisition, Consideration Transferred Consideration for property sold Disposal Group, Including Discontinued Operation, Consideration Assets Disposal Group, Including Discontinued Operation, Assets Liabilities Disposal Group, Including Discontinued Operation, Liabilities Number of RSUs (in millions) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Outstanding beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Distributed (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Outstanding ending balance (in shares) Weighted Average Grant-Date Fair Value (per RSU) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Outstanding beginning balance (in USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in USD per share) Distributed (in USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited (in USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Outstanding ending balance (in USD per share) Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2016-01 Accounting Standards Update 2016-01 [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Foreign Currency Translation Adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Derivative Instrument and Other Adjustments Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] AOCI Attributable to Parent [Roll forward] [Abstract] AOCI Attributable to Parent, Net of Tax [Roll Forward] Beginning balance Stockholders' Equity Attributable to Parent Other comprehensive income (loss) before reclassifications OCI, before Reclassifications, Net of Tax, Attributable to Parent Reclassification of losses (gains), net of tax Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Adoption of ASU Cumulative Effect of New Accounting Principle in Period of Adoption Ending balance Intra-entity foreign currency long-term-investment gains Other Comprehensive Income (Loss), Foreign Currency Translation And Translation Gain (Loss), Before Reclassification And Tax, Intra-Entity Foreign Currency Transactions Long-Term-Investment Nature Other Comprehensive Income (Loss), Foreign Currency Translation and Translation Gain (Loss), before Reclassification and Tax, Intra-Entity Foreign Currency Transactions Long-Term-Investment Nature Relationship with Major Customer Disclosure [Abstract] Relationship with Major Customer Disclosure [Abstract] RELATIONSHIP WITH MAJOR CUSTOMER Relationship With Major Customer [Text Block] This element may be used to capture the complete disclosure about the extent of the entity's reliance on its major customers. If revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, the entity must disclose that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. Schedule of Revenue by Major Customers, by Reporting Segments [Table] Major Customers Customer [Axis] Customer [Domain] Host Hotels & Resorts Inc Host Hotels & Resorts Inc [Member] Host Hotels & Resorts Inc Host Partnerships Host Partnerships [Member] Host Partnerships [Member] Revenue, Major Customer [Line Items] Number of properties owned or leased Number of Customer Owned or Leased Lodging Properties Managed Number of Customer Owned or Leased Lodging Properties Managed Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest Rate Swap Interest Rate Swap [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR London Interbank Offered Rate (LIBOR) [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Senior Notes Senior Notes [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Series DD Notes Series DD Notes [Member] Series DD Notes [Member] Series BB Notes Series BB Notes [Member] Series BB Notes [Member] Series CC Notes Series CC Notes [Member] Series CC Notes [Member] Series BB and Series CC Notes Series BB and Series CC Notes [Member] Series BB and Series CC Notes [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Senior notes, face amount Debt Instrument, Face Amount Senior notes, interest rate Debt Instrument, Interest Rate, Stated Percentage Variable interest rate Derivative, Basis Spread on Variable Rate Net proceeds Proceeds from Debt, Net of Issuance Costs Maximum aggregate borrowings under credit facility (up to) Line of Credit Facility, Maximum Borrowing Capacity Variable interest rate Debt Instrument, Basis Spread on Variable Rate Cash paid for interest, net of amounts capitalized Interest Paid, Excluding Capitalized Interest, Operating Activities Statement of Stockholders' Equity [Abstract] Dividends declared (in USD per share) Common Stock, Dividends, Per Share, Declared Undistributed earnings Retained Earnings, Undistributed Earnings from Equity Method Investees Carrying amount of equity method investments Equity Method Investments Amount by which the fair value of equity method investments exceeds company's share of the book value of the investee's net assets Equity Method Investment, Difference Between Carrying Amount and Underlying Equity JWM Family Enterprise, L.P. JWM Family Enterprise, L.P. [Member] JWM Family Enterprise, L.P. [Member] Management fees Revenue from Related Parties Current Current Income Tax Expense (Benefit), Continuing Operations [Abstract] -U.S. Federal Current Federal Tax Expense (Benefit) -U.S. State Current State and Local Tax Expense (Benefit) -Non-U.S. Current Foreign Tax Expense (Benefit) Current income tax expense Current Income Tax Expense (Benefit) Deferred Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] -U.S. Federal Deferred Federal Income Tax Expense (Benefit) -U.S. State Deferred State and Local Income Tax Expense (Benefit) -Non-U.S. Deferred Foreign Income Tax Expense (Benefit) Deferred income tax expense Deferred Income Tax Expense (Benefit) Provision for income taxes Statement of Financial Position [Abstract] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Brands Contract acquisition costs and other Contract Acquisition Costs And Other [Member] Contract Acquisition Costs And Other [Member] ASSETS Assets [Abstract] Current assets Assets, Current [Abstract] Cash and equivalents Cash and Cash Equivalents, at Carrying Value Accounts and notes receivable, net Accounts and Financing Receivable, after Allowance for Credit Loss, Current Prepaid expenses and other Prepaid Expense and Other Assets Assets held for sale Disposal Group, Including Discontinued Operation, Assets, Current Assets, current, total Assets, Current Intangible assets Intangible assets Goodwill Goodwill Goodwill and intangible assets, net, total Intangible Assets, Net (Including Goodwill) Equity method investments Notes receivable, net Financing Receivable, after Allowance for Credit Loss, Noncurrent Deferred tax assets Deferred Income Tax Assets, Net Other noncurrent assets Other Assets, Noncurrent Total assets Assets LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] Current liabilities Liabilities, Current [Abstract] Current portion of long-term debt Long-term Debt and Lease Obligation, Current Accounts payable Accounts Payable, Trade, Current Accrued payroll and benefits Employee-related Liabilities, Current Liability for guest loyalty program Contract with Customer, Liability, Current Accrued expenses and other Other Liabilities, Current Liabilities, current, total Liabilities, Current Long-term debt Long-term Debt and Lease Obligation Contract with customer Contract with Customer, Liability, Noncurrent Deferred tax liabilities Deferred Income Tax Liabilities, Net Operating lease liabilities Other noncurrent liabilities Other Liabilities, Noncurrent Shareholders’ equity Stockholders' Equity Attributable to Parent [Abstract] Class A Common Stock Common Stock, Value, Issued Additional paid-in-capital Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Treasury stock, at cost Treasury Stock, Value Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Shareholder's equity (deficit) Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Liabilities and deficit, total Liabilities and Equity Accounts and notes receivable, net Prepaid expenses and other Intangible assets Intangible Assets, Net (Excluding Goodwill) [Abstract] Equity method investments Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Current liabilities Accounts payable Accrued expenses and other Deferred tax liabilities Other noncurrent liabilities Deferred Tax Assets Deferred Tax Assets, Net of Valuation Allowance [Abstract] Employee benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits Net operating loss carry-forwards Deferred Tax Assets, Operating Loss Carryforwards Accrued expenses and other reserves Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves Receivables, net Deferred Tax Assets, Receivables, Net Deferred Tax Assets, Receivables, Net Tax credits Deferred Tax Assets, Tax Credit Carryforwards Loyalty Program Deferred Tax Assets, Customer Loyalty Program Liability Deferred Tax Assets, Customer Loyalty Program Liability Deferred income Deferred Tax Assets, Deferred Income Lease liabilities Deferred Tax Assets, Leasing Arrangements Deferred Tax Assets, Leasing Arrangements Other Deferred Tax Assets, Other Deferred tax assets Deferred Tax Assets, Gross Valuation allowance Deferred Tax Assets, Valuation Allowance Deferred tax assets after valuation allowance Deferred Tax Assets, Net of Valuation Allowance Deferred Tax Liabilities Deferred Tax Liabilities, Gross [Abstract] Joint venture interests Deferred Tax Liabilities, Investment in Noncontrolled Affiliates Property and equipment Deferred Tax Liabilities, Property, Plant and Equipment Intangibles Deferred Tax Liabilities, Other Finite-Lived Assets Right-of-use assets Deferred Tax Liabilities, Leasing Arrangements Self-insurance Deferred Tax Liabilities, Deferred Expense, Self Insurance Deferred Tax Liabilities, Deferred Expense, Self Insurance Deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred taxes Deferred Tax Liabilities, Net Schedule of Quarterly Financial Information Quarterly Financial Information [Table Text Block] Schedule of Operating Leased Assets [Table] Renaissance New York Times Square Hotel Renaissance New York Times Square Hotel [Member] Renaissance New York Times Square Hotel [Member] Legacy-Starwood Office Building Legacy-Starwood Office Building [Member] Legacy-Starwood Office Building [Member] Lessee, Lease, Description [Line Items] Lease term Lessee, Operating And Finance Lease, Term Of Contract Lessee, Operating And Finance Lease, Term Of Contract Number of renewals (or more than) Lessee, Operating And Finance Lease, Number of Renewals Lessee, Operating And Finance Lease, Number of Renewals Renewal term Lessee, Operating And Finance Lease, Renewal Term Lessee, Operating And Finance Lease, Renewal Term Impairment loss Operating Lease, Impairment Loss Impairment of long-lived assets Impairment of Long-Lived Assets Held-for-use Impairment loss from leased asset Finance Lease, Impairment Loss Term of lease not commenced Lessee, Operating and Finance Lease, Lease Not Commenced, Term of Contract Lessee, Operating and Finance Lease, Lease Not Commenced, Term of Contract Carrying Values and Fair Values of Non-Current Financial Assets and Liabilities Fair Value, by Balance Sheet Grouping [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table] Segment Reporting Information [Line Items] Accounting Standards Update 2016-16 Accounting Standards Update 2016-16 [Member] Accounting Standards Update 2016-02 Accounting Standards Update 2016-02 [Member] Class A Common Stock Common Stock [Member] Additional Paid-in- Capital Additional Paid-in Capital [Member] Retained Earnings Retained Earnings [Member] Treasury Stock, at Cost Treasury Stock [Member] Accumulated Other Comprehensive Loss Class of Stock Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Class A Common Stock Common Class A [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance (in shares) Common Stock, Shares, Outstanding Other comprehensive income (loss) Dividends ($1.29 per share) Dividends, Cash Share-based compensation plans (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Share-based compensation plans Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Purchase of treasury stock Treasury Stock, Value, Acquired, Cost Method Purchase of treasury stock (in shares) Treasury Stock, Shares, Acquired Ending balance (in shares) Common stock, authorized (in shares) Common Stock, Shares Authorized Common stock, par value (in USD per share) Common Stock, Par or Stated Value Per Share Preferred stock, authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, outstanding (in shares) Preferred Stock, Shares Outstanding Composition of Intangible Assets, Finite-Lived Schedule of Finite-Lived Intangible Assets [Table Text Block] Composition of Intangible Assets, Indefinite-Lived Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Carrying Amount of Goodwill Schedule of Goodwill [Table Text Block] Additional Information on RSUs Schedule Of Additional Information On Restricted Stock Units [Table Text Block] Schedule Of Additional Information On Restricted Stock Units [Table Text Block] Changes in Outstanding RSU Grants Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Schedule of Goodwill [Table] Schedule of Goodwill [Table] North American Full-Service North American Limited-Service Other International Goodwill [Line Items] Goodwill [Line Items] Goodwill [Roll Forward] Goodwill [Roll Forward] Beginning balance Foreign currency translation Goodwill, Foreign Currency Translation Gain (Loss) Ending balance Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts Measurement Basis [Axis] Fair Value, Disclosure Item Amounts [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Carrying Amount Reported Value Measurement [Member] Fair Value Estimate of Fair Value Measurement [Member] Senior, mezzanine, and other loans Total noncurrent financial assets Financial Instruments, Assets, Noncurrent Total of all noncurrent financial instruments that are assets. Senior Notes Senior Notes, Noncurrent Commercial paper Long-term Commercial Paper, Noncurrent Other long-term debt Other Long-term Debt, Noncurrent Total noncurrent financial liabilities Financial Instruments, Liabilities, Noncurrent Total of all noncurrent financial instruments that are liabilities. PROPERTY AND EQUIPMENT Property, Plant and Equipment Disclosure [Text Block] Weighted Average Remaining Lease Term (in years) Lease, Weighted Average Remaining Lease Term [Abstract] Lease, Weighted Average Remaining Lease Term [Abstract] Operating leases Operating Lease, Weighted Average Remaining Lease Term Finance leases Finance Lease, Weighted Average Remaining Lease Term Weighted Average Discount Rate Lease, Weighted Average Discount Rate, Percent [Abstract] Lease, Weighted Average Discount Rate, Percent [Abstract] Operating leases Operating Lease, Weighted Average Discount Rate, Percent Finance leases Finance Lease, Weighted Average Discount Rate, Percent BASIS OF PRESENTATION Basis of Presentation and Significant Accounting Policies [Text Block] Composition of Lease Expense and Supplemental Cash Flows Lease, Cost [Table Text Block] Maturities of Finance Lease Liabilities Finance Lease, Liability, Maturity [Table Text Block] Maturities of Operating Lease Liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Lease Terms and Discount Rate Schedule of Lessee, Leases, Terms [Table Text Block] Schedule of Lessee, Leases, Terms [Table Text Block] Accumulated Other Comprehensive (Loss) Income Activity Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Asset Acquisition [Table] Schedule of Asset Acquisition [Table] Schedule of Asset Acquisition [Table] Management and Franchise Contracts Management and Franchise Contracts [Member] Management and Franchise Contracts [Member] Brands Trade Dress [Member] Elegant Hotels Group plc Elegant Hotels Group plc [Member] Elegant Hotels Group plc [Member] W New York - Union Square W New York - Union Square [Member] W New York - Union Square [Member] AC Hotels by Marriott AC Hotels by Marriott [Member] AC Hotels by Marriott [Member] Schedule of Asset Acquisition [Line Items] Schedule of Asset Acquisition [Line Items] [Line Items] for Schedule of Asset Acquisition [Table] Offer for issued and to be issued share capital Payments for Asset Acquisition, Gross Payments for Asset Acquisition, Gross Debt assumed Asset Acquisition, Debt Asset Acquisition, Debt Property purchased Payments for Asset Acquisitions Payments for Asset Acquisitions Number of hotels acquired Asset Acquisition, Number of Properties Acquired Asset Acquisition, Number of Properties Acquired Indefinite lived intangible assets acquired Indefinite-lived Intangible Assets Acquired Finite lived intangible assets term Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Finite lived intangible assets acquired Finite-lived Intangible Assets Acquired Series K Notes, interest rate of 3.0%, face amount of $600, matured March 1, 2019 (effective interest rate of 4.4%) Series K Senior Notes [Member] Series K, Senior Notes, 3.000 Percent, Due March 1, 2019 Series L Notes, interest rate of 3.3%, face amount of $350, maturing September 15, 2022 (effective interest rate of 3.4%) Series L Senior Notes [Member] Series L, Senior Notes, 3.250 Percent, Due September 15, 2022 Series M Notes, interest rate of 3.4%, face amount of $350, maturing October 15, 2020 (effective interest rate of 3.6%) Series M Senior Notes [Member] Series M, Senior Notes, 3.375 Percent, Due October 15, 2020 Series N Notes, interest rate of 3.1%, face amount of $400, maturing October 15, 2021 (effective interest rate of 3.4%) Series N Senior Notes [Member] Series N Senior Notes [Member] Series O Notes, interest rate of 2.9%, face amount of $450, maturing March 1, 2021 (effective interest rate of 3.1%) Series O Senior Notes [Member] Series O Senior Notes [Member] Series P Notes, interest rate of 3.8%, face amount of $350, maturing October 1, 2025 (effective interest rate of 4.0%) Series P Senior Notes [Member] Series P Senior Notes [Member] Series Q Notes, interest rate of 2.3%, face amount of $750, maturing January 15, 2022 (effective interest rate of 2.5%) Series Q Notes [Member] Series Q Notes [Member] Series R Notes, interest rate of 3.1%, face amount of $750, maturing June 15, 2026 (effective interest rate of 3.3%) Series R Notes [Member] Series R Notes [Member] Series T Notes, interest rate of 7.2%, face amount of $181, matured December 1, 2019 (effective interest rate of 2.3%) Series T Notes [Member] Series T Notes [Member] Series U Notes, interest rate of 3.1%, face amount of $291, maturing February 15, 2023 (effective interest rate of 3.1%) Series U Notes [Member] Series U Notes [Member] Series V Notes, interest rate of 3.8%, face amount of $318, maturing March 15, 2025 (effective interest rate of 2.8%) Series V Notes [Member] Series V Notes [Member] Series W Notes, interest rate of 4.5%, face amount of $278, maturing October 1, 2034 (effective interest rate of 4.1%) Series W Notes [Member] Series W Notes [Member] Series X Notes, interest rate of 4.0%, face amount of $450, maturing April 15, 2028 (effective interest rate of 4.2%) Series X Notes [Member] Series X Notes [Member] Series Y Notes, floating rate, face amount of $550, maturing December 1, 2020 (effective interest rate of 2.5% at December 31, 2019) Series Y Notes [Member] Series Y Notes [Member] Series Z Notes, interest rate of 4.2%, face amount of $350, maturing December 1, 2023 (effective interest rate of 4.4%) Series Z Notes [Member] Series Z Notes [Member] Series AA Notes, interest rate of 4.7%, face amount of $300, maturing December 1, 2028 (effective interest rate of 4.8%) Series AA Notes [Member] Series AA Notes [Member] Series BB Notes, floating rate, face amount of $300, maturing March 8, 2021 (effective interest rate of 2.5% at December 31, 2019) Series CC Notes, interest rate of 3.6%, face amount of $550, maturing April 15, 2024 (effective interest rate of 3.9%) Series DD Notes, interest rate of 2.1%, face amount of $550, maturing October 3, 2022 (effective interest rate of 2.4%) Other Other Long-term Debt [Member] Other Long-term Debt [Member] Senior Notes Senior Notes Commercial paper Credit Facility Long-term Line of Credit Finance lease obligations Finance lease obligations Capital Lease Obligations Other Long-term Debt Less: Current portion of long-term debt Long-term debt, noncurrent Senior notes, effective interest rate Debt Instrument, Interest Rate, Effective Percentage Financial Data Resulting from Transactions with Related Parties, Income Statement Data Income Statement Data Resulting from Related Party Transactions [Table Text Block] Income Statement Data Resulting from Related Party Transactions Financial Data Resulting from Transactions with Related Parties, Balance Sheet Data Balance Sheet Data Resulting from Related Party Transactions [Table Text Block] Balance Sheet Data Resulting from Related Party Transactions Summarized Information for the Entities Equity Method Investments, Income Statement Equity Method Investees, Income Statement Data [Table Text Block] Equity Method Investees, Income Statement Data Summarized Information for the Entities Equity Method Investments, Balance Sheet Equity Method Investees, Balance Sheet Data [Table Text Block] Equity Method Investees, Balance Sheet Data Composition of Property and Equipment Balances Property, Plant and Equipment [Table Text Block] Components of Earnings Before Income Taxes Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Provision for Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Unrecognized Tax Benefits Reconciliation Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Reconciliation of the U.S. Statutory Tax Rate to Effective Income Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Maximum Potential Amount of Future Fundings as the Primary Obligor for Guarantees and the Liability for Expected Future Fundings Schedule of Guarantor Obligations [Table Text Block] Cash paid for amounts included in the measurement of lease liabilities: Cash Flow, Lessee [Abstract] Cash Flow, Lessee [Abstract] Operating cash outflows for operating leases Operating Lease, Payments Operating cash outflows for finance leases Finance Lease, Interest Payment on Liability Financing cash outflows for finance leases Finance Lease, Principal Payments Lease assets obtained in exchange for lease obligations: Right-of-Use Asset Obtained in Exchange for Lease Liability [Abstract] Right-of-Use Asset Obtained in Exchange for Lease Liability [Abstract] Operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability