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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2026	Jul. 13, 2026	Dec. 31, 2025
Loss Contingencies
Contingent consideration liability	$ 352
Contingent consideration, current liability	1		$ 3
Contingent consideration, noncurrent liability	142		177
Self insurance reserves	150		146
Self insurance reserve, current	53		55
Self-insurance reserves, noncurrent	97		91
Surety bonds	163
Maximum borrowing capacity	114
Letter of Credit
Loss Contingencies
Decrease in available capacity of credit facility	$ 3
Various US
Loss Contingencies
Multiemployer plans, collective-bargaining arrangement, percentage of participants	22.00%
Level Three—Significant Unobservable Inputs
Loss Contingencies
Guarantees, fair value disclosure	$ 215		180
Financial Guarantee
Loss Contingencies
Maximum potential future payments	50		63
Unlimited Vacation Club \| Partner's Investment Guarantee
Loss Contingencies
Maximum potential future payments	70
Unconsolidated Hospitality Ventures \| Tax Obligation Guarantee
Loss Contingencies
Maximum potential future payments	102
Unconsolidated Hospitality Ventures \| Tax Obligation Guarantee \| Subsequent Event
Loss Contingencies
Maximum potential future payments		$ 33
Performance Guarantee
Loss Contingencies
Maximum potential future payments	171
Guarantor obligations, liability, current carrying value	119		114
Performance Guarantee \| Balance Sheet Location [Axis]: us-gaap:AccruedLiabilitiesCurrent
Loss Contingencies
Guarantor obligations, liability, current carrying value	12		19
Performance Guarantee \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Loss Contingencies
Guarantor obligations, liability, current carrying value	107		95
Performance Test Clause Guarantee
Loss Contingencies
Guarantor obligations, liability, current carrying value	4		$ 4
Various Business Ventures
Loss Contingencies
Commitment to loan or investment	$ 750