Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	[1]
Property Plant And Equipment [Abstract]
Land	$ 3,333	$ 3,364
Buildings and leasehold improvements	5,705	5,911
Furniture and equipment	971	966
Construction-in-progress	125	117
Property and equipment, gross	10,134	10,358
Accumulated depreciation and amortization	(2,160)	(2,047)
Property and equipment, net	$ 7,974	$ 8,311

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