COMMITMENTS AND CONTINGENCIES - Guarantees (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2017
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	$ 227
Recorded Liability for Guarantees	127
Debt service
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	20
Recorded Liability for Guarantees	5
Operating profit
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	189
Recorded Liability for Guarantees	118
Other
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	18
Recorded Liability for Guarantees	4
Sheraton Grand Chicago Hotel
Commitments and Contingencies Disclosure [Line Items]
Recorded Liability for Guarantees	300	$ 300
Sheraton Grand Chicago Hotel \| Land and Hotel
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings			$ 300
Sheraton Grand Chicago Hotel \| Land
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings			$ 200
Not Yet In Effect Condition \| Operating profit
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	42
Not Yet In Effect Condition \| Other
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	3
Accrued Expenses and Other
Commitments and Contingencies Disclosure [Line Items]
Recorded Liability for Guarantees	17
Other noncurrent liabilities
Commitments and Contingencies Disclosure [Line Items]
Recorded Liability for Guarantees	$ 110
Minimum
Commitments and Contingencies Disclosure [Line Items]
Guarantee obligations, term	3 years
Maximum
Commitments and Contingencies Disclosure [Line Items]
Guarantee obligations, term	10 years