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Property, Equipment, and Capitalized Software, Net - Depreciation and Amortization (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Amortization of capitalized software $ 64 $ 62 $ 37
Depreciation of property and equipment 42 45 50
Amortization of intangible assets 31 32 17
Depreciation and amortization 137 139 104
Recorded in cost of service revenue: 41 43 21
Other 0 0 1
Depreciation and amortization reported in the statement of cash flows 178 182 126
Capitalized software      
Property, Plant and Equipment [Line Items]      
Recorded in cost of service revenue: 28 22 15
Deferred contract costs      
Property, Plant and Equipment [Line Items]      
Recorded in cost of service revenue: $ 13 $ 21 $ 6