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Property, Equipment and Intangible Assets (Property And Equipment) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property, Equipment and Intangible Assets [Abstract]    
Leasehold improvements $ 7 $ 6
Computer equipment 17 14
Office furniture and equipment 2 2
Property and equipment, gross 26 22
Less—accumulated depreciation and amortization (12) (9)
Property and equipment, net 14 13
Internally developed software 52 49
Intangible assets (acquired technology) 8 7
Less-accumulated amortization (31) (28)
Intangible assets, net 29 28
Total property equipment and intangible assets, net $ 43 $ 41