Business Segments - Segment Revenues (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 5,561	$ 3,772
Total segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	5,414	3,710
Other unallocated corporate
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	147	62
North American Full-Service | Total segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	3,576	2,321
North American Limited-Service | Total segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	924	833
Asia Pacific | Total segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	312	141
Other International | Total segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 602	$ 415