Business Segments - Reconciliation of Revenue from Segment Amounts to Consolidated Amounts (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		$ 2,395	$ 2,253	$ 7,083	$ 6,618
Amortization of contract acquisition costs		(7)	(6)	(21)	(20)
Franchise and licensing fees in segment revenues [member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		447	409	1,277	1,147
Base and other management fees in segment revenues [member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[1]	95	95	293	286
Incentive management fees in segment revenues [member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		54	57	167	171
Management and franchise [member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		596	561	1,737	1,604
Ownership [member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		361	373	1,060	1,099
Segment operating income [member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		957	934	2,797	2,703
Intersegment eliminations [member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[1]	(12)	(11)	(31)	(30)
Other revenues [member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		23	27	75	72
Direct reimbursements from managed and franchised properties [member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[2]	770	710	2,334	2,139
Indirect reimbursements from managed and franchised properties [member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[2]	$ 664	$ 599	$ 1,929	$ 1,754

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

[2] Included in other revenues from managed and franchised properties in our condensed consolidated statements of operations.