Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Property Plant And Equipment [Abstract]
Land	$ 3,398	$ 3,397
Buildings and leasehold improvements	6,093	6,015
Furniture and equipment	992	922
Construction-in-progress	72	79
Property and equipment, gross	10,555	10,413
Accumulated depreciation and amortization	(2,091)	(1,872)
Property and equipment, net	$ 8,464	$ 8,541