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RELATED-PARTY TRANSACTIONS - Equity Method Investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Feb. 28, 2024	Feb. 27, 2024	Dec. 31, 2023
Related Party Transaction
Net receivables	$ 960		$ 960				$ 883
Total long-term financing receivables, net of allowances	$ 310		$ 310				73
Unconsolidated Hospitality Ventures
Related Party Transaction
Equity method investment, ownership percentage					38.80%	50.00%
Minimum \| Unconsolidated Hospitality Ventures
Related Party Transaction
Equity method investment, ownership percentage	20.00%		20.00%
Maximum \| Unconsolidated Hospitality Ventures
Related Party Transaction
Equity method investment, ownership percentage	50.00%		50.00%
Related Party
Related Party Transaction
Net receivables	$ 92		$ 92				43
Total long-term financing receivables, net of allowances	42		42				$ 21
Franchise or License Fees \| Related Party
Related Party Transaction
Related party amounts	22	$ 5	61	$ 17
Related Parties Guarantees \| Related Party
Related Party Transaction
Related party amounts	$ 0	$ 1	$ 1	$ 4