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Significant Accounting Policies - Property Plant and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Total property and equipment $ 28,934   $ 26,869
Accumulated depreciation and amortization (16,890)   (15,520)
Property and equipment, net 12,044 $ 11,360  
Property and equipment, net     11,349
Land      
Property, Plant and Equipment [Line Items]      
Total property and equipment 1,981   1,872
Building and improvements      
Property, Plant and Equipment [Line Items]      
Total property and equipment 4,068   3,785
Fixtures and equipment      
Property, Plant and Equipment [Line Items]      
Total property and equipment 13,807   13,028
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Total property and equipment 5,611   5,384
Software      
Property, Plant and Equipment [Line Items]      
Total property and equipment $ 3,467   $ 2,800