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Property and Equipment (Schedule of Property and Equipment) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment    
Property and equipment, and finance lease right-of-use asset, gross $ 2,292 $ 2,177
Accumulated depreciation and amortization (1,405) (1,277)
Total property and equipment, and finance lease right-of-use asset, net 887 900
Land    
Property, Plant and Equipment    
Property and equipment, gross 48 34
Buildings    
Property, Plant and Equipment    
Property and equipment, gross 295 275
Leasehold improvements    
Property, Plant and Equipment    
Property and equipment, gross 157 163
Computer equipment    
Property, Plant and Equipment    
Property and equipment, and finance lease right-of-use asset, gross 1,622 1,382
Furniture, fixtures, and other equipment    
Property, Plant and Equipment    
Property and equipment, and finance lease right-of-use asset, gross $ 170 $ 323