Business Segments - Segment Revenues (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 5,795	$ 3,902	$ 11,356	$ 7,674
Total segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	5,646	3,837	11,060	7,547
Other unallocated corporate
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	149	65	296	127
North American Full-Service | Total segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	3,619	2,360	7,195	4,681
North American Limited-Service | Total segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	1,032	906	1,956	1,739
Asia Pacific | Total segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	319	146	631	287
Other International | Total segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 676	$ 425	$ 1,278	$ 840