Summary of Property and Equipment (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Property Plant And Equipment [Abstract]
Land and land improvements	$ 2,065	$ 2,033
Buildings and leasehold improvements	13,780	13,609
Furniture and equipment	2,494	2,471
Construction in progress	196	166
Property, Plant and Equipment, Gross, Total	18,535	18,279
Less accumulated depreciation and amortization	(9,029)	(8,863)
Property and equipment, net	$ 9,506	$ 9,416