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Property and Equipment, net (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 2,012 $ 1,942
Less: accumulated depreciation 455 358
Property and equipment, net 1,557 1,584
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 516 547
Buildings and leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 714 666
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 623 544
Construction in progress [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 159 $ 185