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Deferred Contract Costs (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Capitalized Contract Cost          
Deferred contract costs, net $ 412,000,000   $ 412,000,000   $ 354,000,000
Amortization of contract costs 30,000,000 $ 26,000,000 58,000,000 $ 46,000,000  
Deferred contract costs impairment 0 $ 0 0 $ 0  
Contract costs on implementations in progress          
Capitalized Contract Cost          
Deferred contract costs, net 117,000,000   117,000,000   104,000,000
Incremental contract origination costs on completed implementations, net          
Capitalized Contract Cost          
Deferred contract costs, net 172,000,000   172,000,000   127,000,000
Contract fulfillment costs on completed implementations, net          
Capitalized Contract Cost          
Deferred contract costs, net $ 123,000,000   $ 123,000,000   $ 123,000,000