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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2017 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |
Compensation costs from retirement savings plan |  | $ 80,000,000 | $ 75,000,000 | $ 128,000,000 |
Advertising costs |  | 470,000,000 | 276,000,000 | 851,000,000 |
Allowance for credit losses |  | 187,000,000 | 207,000,000 |  |
Change in allowance for credit losses |  | 22,000,000 | 136,000,000 |  |
Goodwill impairment charge |  | 0 | 0 | 0 |
Self-insurance reserve, current |  | 124,000,000 | 121,000,000 |  |
Self-insurance reserve, noncurrent |  | 290,000,000 | 341,000,000 |  |
Accrued expenses and other |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Current deferred revenue |  | $ 346,000,000 | 325,000,000 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Avendra LLC |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Gain (loss) on disposal |  |  |  |  | $ 664,000,000
Gain (loss) on disposal, net of tax |  |  |  |  | $ 425,000,000
Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Self insurance review, measurement input |  | 0.02 |  |  |
Deferred revenue |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Change in customer contract liability |  | $ (340,000,000) |  |  |
Customer contract liability |  | 1,527,000,000 | 1,867,000,000 |  |
Revenue recognized from customer contract liability |  | 334,000,000 |  |  |
Guest loyalty program |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Change in customer contract liability |  | 200,000,000 |  |  |
Customer contract liability |  | 6,471,000,000 | 6,271,000,000 |  |
Current deferred revenue |  | 2,522,000,000 | 1,769,000,000 |  |
Revenue recognized from customer contract liability |  | 1,966,000,000 |  |  |
Reclassification from deferred revenue |  | 228,000,000 |  |  |
Change in customer contract liability from change in estimates |  | (58,000,000) |  |  |
Reimbursements |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Cost of revenues | [1] | 10,322,000,000 | 8,435,000,000 | 16,439,000,000 |
Reimbursements | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Avendra LLC |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Cost of revenues |  | 56,000,000 | 62,000,000 | 118,000,000 |
Cost of revenues, net of tax |  | 42,000,000 | 46,000,000 | $ 87,000,000 |
Costs Incurred to Fulfill Contracts |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Capitalized costs |  | $ 368,000,000 | $ 366,000,000 |  |
[1] | See Note 15 for disclosure of related party amounts.

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