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Property, Equipment, and Capitalized Software, Net - Depreciation and Amortization (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Amortization of capitalized software $ 42 $ 64 $ 62
Depreciation of property and equipment 36 42 45
Amortization of intangible assets 21 31 32
Subtotal 99 137 139
Recorded in cost of service revenue: 28 41 43
Total depreciation and amortization recognized 127 178 182
Capitalized software      
Property, Plant and Equipment [Line Items]      
Recorded in cost of service revenue: 19 28 22
Deferred contract costs      
Property, Plant and Equipment [Line Items]      
Recorded in cost of service revenue: $ 9 $ 13 $ 21