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Property, Equipment, and Capitalized Software - Depreciation and Amortization (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Amortization of capitalized software $ 62 $ 37 $ 41
Depreciation of property and equipment 45 50 34
Amortization of intangible assets 32 17 18
Depreciation and amortization 139 104 93
Recorded in cost of service revenue: 43 21 38
Other 0 1 3
Depreciation and amortization reported in the statement of cash flows 182 126 134
Capitalized software      
Property, Plant and Equipment [Line Items]      
Recorded in cost of service revenue: 22 15 18
Deferred contract costs      
Property, Plant and Equipment [Line Items]      
Recorded in cost of service revenue: $ 21 $ 6 $ 20