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Property, Equipment and Intangible Assets (Property And Equipment) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Property, Equipment and Intangible Assets [Abstract]    
Leasehold improvements $ 37 $ 9
Computer equipment 24 19
Office furniture and equipment 14 5
Property and equipment, gross 75 33
Less—accumulated depreciation and amortization (13) (13)
Property and equipment, net 62 20
Internally developed software 68 61
Less-accumulated amortization (34) (28)
Intangible assets, net 34 33
Total property equipment and intangible assets, net $ 96 $ 53