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Property and Equipment (Schedule of Property and Equipment) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,488 $ 1,396
Accumulated depreciation and amortization (862) (785)
Property and equipment, net 626 611
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 31 30
Building [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 204 203
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 137 139
Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 909 846
Furniture, Fixture and Other Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 207 $ 178