SEGMENT INFORMATION - Schedule of Segment Revenues to Segment Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information
Segment revenues	$ 1,718	$ 1,714
Pro rata share of unconsolidated owned and leased hospitality ventures' Adjusted EBITDA	(12)	(17)
Segment revenues
Segment Reporting Information
Segment revenues	852	925
Owned and leased
Segment Reporting Information
Segment revenues	219	309
Reimbursed costs	(194)	(250)
Distribution
Segment Reporting Information
Segment revenues	315	319
Reimbursed costs	(266)	(274)
Operating Segments
Segment Reporting Information
Segment revenues	1,731	1,736
Adjusted general and administrative expenses	(69)	(72)
Other income (expenses)	(22)	(42)
Pro rata share of unconsolidated owned and leased hospitality ventures' Adjusted EBITDA	12	17
Segment Adjusted EBITDA	312	304
Operating Segments \| Management and franchising
Segment Reporting Information
Segment revenues	1,193	1,075
Adjusted general and administrative expenses	(67)	(63)
Other income (expenses)	(24)	(20)
Pro rata share of unconsolidated owned and leased hospitality ventures' Adjusted EBITDA	0	0
Segment Adjusted EBITDA	236	203
Operating Segments \| Owned and leased
Segment Reporting Information
Segment revenues	223	316
Adjusted general and administrative expenses	(2)	(3)
Other income (expenses)	0	2
Pro rata share of unconsolidated owned and leased hospitality ventures' Adjusted EBITDA	12	17
Segment Adjusted EBITDA	27	62
Operating Segments \| Distribution
Segment Reporting Information
Segment revenues	315	345
Adjusted general and administrative expenses	0	(6)
Other income (expenses)	2	(24)
Pro rata share of unconsolidated owned and leased hospitality ventures' Adjusted EBITDA	0	0
Segment Adjusted EBITDA	49	39
Operating Segments \| Segment revenues
Segment Reporting Information
Segment revenues	865	947
Operating Segments \| Segment revenues \| Management and franchising
Segment Reporting Information
Segment revenues	327	286
Operating Segments \| Segment revenues \| Owned and leased
Segment Reporting Information
Segment revenues	223	316
Operating Segments \| Segment revenues \| Distribution
Segment Reporting Information
Segment revenues	315	345
Operating Segments \| Owned and leased
Segment Reporting Information
Segment revenues	223	316
Reimbursed costs	(206)	(270)
Operating Segments \| Owned and leased \| Management and franchising
Segment Reporting Information
Segment revenues	0	0
Reimbursed costs	0	0
Operating Segments \| Owned and leased \| Owned and leased
Segment Reporting Information
Segment revenues	223	316
Reimbursed costs	(206)	(270)
Operating Segments \| Owned and leased \| Distribution
Segment Reporting Information
Segment revenues	0	0
Reimbursed costs	0	0
Operating Segments \| Distribution
Segment Reporting Information
Segment revenues	315	319
Reimbursed costs	(268)	(276)
Operating Segments \| Distribution \| Management and franchising
Segment Reporting Information
Segment revenues	0	0
Reimbursed costs	0	0
Operating Segments \| Distribution \| Owned and leased
Segment Reporting Information
Segment revenues	0	0
Reimbursed costs	0	0
Operating Segments \| Distribution \| Distribution
Segment Reporting Information
Segment revenues	315	319
Reimbursed costs	$ (268)	$ (276)

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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