Business Segments - Reconciliation of Revenue from Segment Amounts to Consolidated Amounts (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		$ 2,867	$ 2,673	$ 8,391	$ 7,626
Amortization of contract acquisition costs		(12)	(11)	(37)	(32)
Segment revenues
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		1,203	1,139	3,430	3,186
Segment revenues | Ownership
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		330	335	922	924
Segment revenues | Management and Franchise
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		873	804	2,508	2,262
Segment Reconciling Items
Segment Reporting, Revenue Reconciling Item [Line Items]
Amortization of contract acquisition costs		(12)	(11)	(37)	(32)
Intersegment eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[1]	9	6	22	17
Franchise and licensing fees
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		698	643	1,958	1,769
Franchise and licensing fees | Management and Franchise
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		704	647	1,974	1,782
Base and other management fees
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		88	81	287	247
Base and other management fees | Management and Franchise
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[1]	103	94	330	283
Incentive management fees
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		66	63	204	197
Incentive management fees | Management and Franchise
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		66	63	204	197
Other revenues
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		58	45	179	126
Other revenues | Segment Reconciling Items
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		58	45	179	126
Other revenues from managed and franchised properties
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		1,627	1,506	4,841	4,363
Other revenues from managed and franchised properties | Segment Reconciling Items
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		$ 1,627	$ 1,506	$ 4,841	$ 4,363

[1] Includes management, royalty and IP fees charged to consolidated hotels in our ownership segment by our management and franchise segment, which were eliminated in our condensed consolidated statements of operations.