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Deferred Contract Costs (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Capitalized Contract Cost    
Total Deferred contract costs, net $ 667 $ 475
Contract costs on implementations in progress    
Capitalized Contract Cost    
Total Deferred contract costs, net 138 93
Contract origination costs on completed implementations, net    
Capitalized Contract Cost    
Total Deferred contract costs, net 352 219
Contract fulfillment costs on completed implementations, net    
Capitalized Contract Cost    
Total Deferred contract costs, net $ 177 $ 163