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Deferred Contract Costs (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Capitalized Contract Cost    
Deferred contract costs, net $ 538 $ 475
Contract costs on implementations in progress    
Capitalized Contract Cost    
Deferred contract costs, net 82 93
Incremental contract origination costs on completed implementations, net    
Capitalized Contract Cost    
Deferred contract costs, net 279 219
Contract fulfillment costs on completed implementations, net    
Capitalized Contract Cost    
Deferred contract costs, net $ 177 $ 163