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Property and Equipment (Schedule of Property and Equipment) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment    
Property and equipment, gross $ 2,177 $ 1,645
Accumulated depreciation and amortization (1,277) (1,058)
Total Property and equipment, net 900 587
Land    
Property, Plant and Equipment    
Property and equipment, gross 34 31
Buildings    
Property, Plant and Equipment    
Property and equipment, gross 275 235
Leasehold improvements    
Property, Plant and Equipment    
Property and equipment, gross 163 135
Computer equipment    
Property, Plant and Equipment    
Property and equipment, gross 1,382 1,047
Furniture, fixtures, and other equipment    
Property, Plant and Equipment    
Property and equipment, gross $ 323 $ 197