Property and Equipment, Net (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 24,859	$ 24,409
Less — accumulated depreciation and amortization	(10,015)	(9,255)
Property and equipment, net	14,844	15,154
Land and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	650	651
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	17,662	17,861
Furniture, Fixtures, Equipment And Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	4,520	4,255
Transportation [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	520	458
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 1,507	$ 1,184