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Property and Equipment, net (Schedule of Property and Equipment, Net) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Total property and equipment $ 919 $ 830  
Less: accumulated depreciation and amortization (557) (507)  
Total property and equipment, net 362 323 $ 292
Data processing equipment and software      
Property, Plant and Equipment [Line Items]      
Total property and equipment 665 576  
Furniture, equipment and leasehold improvements      
Property, Plant and Equipment [Line Items]      
Total property and equipment $ 254 $ 254