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Property and Equipment, Net (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 23,563 $ 23,372
Less — accumulated depreciation and amortization (7,997) (7,469)
Property and equipment, net 15,566 15,903
Land and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 677 626
Building and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 17,588 17,478
Furniture, Fixtures, Equipment and Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 3,765 3,720
Transportation [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 455 454
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,078 $ 1,094