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Deferred Contract Costs (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Capitalized Contract Cost    
Total Deferred contract costs, net $ 959 $ 917
Contract costs on implementations in progress    
Capitalized Contract Cost    
Total Deferred contract costs, net 186 245
Contract origination costs on completed implementations, net    
Capitalized Contract Cost    
Total Deferred contract costs, net 540 470
Contract fulfillment costs on completed implementations, net    
Capitalized Contract Cost    
Total Deferred contract costs, net $ 233 $ 202