Property and Equipment (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 9,199	$ 9,134
Less: accumulated depreciation	(1,770)	(1,688)
Property and equipment, net	7,429	7,446
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,584	3,584
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	4,164	4,149
Furniture, fixtures, and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,354	1,346
Construction in progress
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 97	$ 55