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Property, Equipment and Intangible Assets (Property And Equipment) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Property, Equipment and Intangible Assets [Abstract]    
Leasehold improvements $ 6 $ 16
Computer equipment 14 9
Office furniture and equipment 2 2
Property and equipment, gross 22 27
Less—accumulated depreciation and amortization (9) (17)
Property and equipment, net 13 10
Internally developed software 49 47
Intangible assets (acquired technology) 7 8
Less-accumulated amortization (28) (25)
Intangible assets, net 28 30
Total property equipment and intangible assets, net $ 41 $ 40