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Deferred Contract Costs (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Capitalized Contract Cost    
Total Deferred contract costs, net $ 917 $ 667
Contract costs on implementations in progress    
Capitalized Contract Cost    
Total Deferred contract costs, net 245 138
Contract origination costs on completed implementations, net    
Capitalized Contract Cost    
Total Deferred contract costs, net 470 352
Contract fulfillment costs on completed implementations, net    
Capitalized Contract Cost    
Total Deferred contract costs, net $ 202 $ 177