Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	[1]
Property Plant And Equipment [Abstract]
Land	$ 3,335	$ 3,364
Buildings and leasehold improvements	5,672	5,911
Furniture and equipment	937	966
Construction-in-progress	150	117
Property and equipment, gross	10,094	10,358
Accumulated depreciation and amortization	(2,095)	(2,047)
Property and equipment, net	$ 7,999	$ 8,311

[1] Excludes $31 million of property and equipment, net classified as held for sale as of December 31, 2017.