Summary of Property and Equipment (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property Plant And Equipment [Abstract]
Land and land improvements	$ 2,033	$ 2,062
Buildings and leasehold improvements	13,609	13,308
Furniture and equipment	2,471	2,362
Construction in progress	166	262
Property, Plant and Equipment, Gross, Total	18,279	17,994
Less accumulated depreciation and amortization	(8,863)	(8,323)
Property and equipment, net	$ 9,416	$ 9,671	$ 9,760