SEGMENT INFORMATION - Schedule of Segment Revenues to Segment Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting
Segment revenues	$ 1,829	$ 1,808	$ 3,577	$ 3,526
Segment revenues
Segment Reporting
Segment revenues	823	878	1,649	1,730
Owned and leased
Segment Reporting
Segment revenues	274	304	493	523
Reimbursed costs	(223)	(246)	(423)	(440)
Distribution
Segment Reporting
Segment revenues	225	262	499	577
Reimbursed costs	(198)	(219)	(443)	(485)
Operating Segments
Segment Reporting
Segment revenues	1,844	1,824	3,605	3,555
Operating Segments \| Management and franchising
Segment Reporting
Segment revenues	1,340	1,253	2,604	2,446
Adjusted general and administrative expenses	(68)	(65)	(146)	(132)
Other segment items	0	(20)	0	(44)
Segment Adjusted EBITDA	266	238	530	474
Operating Segments \| Owned and leased
Segment Reporting
Segment revenues	279	309	502	532
Adjusted general and administrative expenses	(3)	(3)	(5)	(5)
Other segment items	1	2	1	2
Segment Adjusted EBITDA	40	47	50	62
Operating Segments \| Distribution
Segment Reporting
Segment revenues	225	262	499	577
Adjusted general and administrative expenses	0	0	0	0
Other segment items	1	1	3	3
Segment Adjusted EBITDA	27	43	56	92
Operating Segments \| Segment revenues
Segment Reporting
Segment revenues	838	894	1,677	1,759
Operating Segments \| Segment revenues \| Management and franchising
Segment Reporting
Segment revenues	334	323	676	650
Operating Segments \| Segment revenues \| Owned and leased
Segment Reporting
Segment revenues	279	309	502	532
Operating Segments \| Segment revenues \| Distribution
Segment Reporting
Segment revenues	225	262	499	577
Operating Segments \| Owned and leased
Segment Reporting
Segment revenues	279	309	502	532
Operating Segments \| Owned and leased \| Management and franchising
Segment Reporting
Segment revenues	0	0	0	0
Reimbursed costs	0	0	0	0
Operating Segments \| Owned and leased \| Owned and leased
Segment Reporting
Segment revenues	279	309	502	532
Reimbursed costs	(237)	(261)	(448)	(467)
Operating Segments \| Owned and leased \| Distribution
Segment Reporting
Segment revenues	0	0	0	0
Reimbursed costs	0	0	0	0
Operating Segments \| Distribution
Segment Reporting
Segment revenues	225	262	499	577
Operating Segments \| Distribution \| Management and franchising
Segment Reporting
Segment revenues	0	0	0	0
Reimbursed costs	0	0	0	0
Operating Segments \| Distribution \| Owned and leased
Segment Reporting
Segment revenues	0	0	0	0
Reimbursed costs	0	0	0	0
Operating Segments \| Distribution \| Distribution
Segment Reporting
Segment revenues	225	262	499	577
Reimbursed costs	$ (199)	$ (220)	$ (446)	$ (488)