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Deferred Contract Costs (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Capitalized Contract Cost    
Deferred contract costs, net $ 749 $ 667
Contract costs on implementations in progress    
Capitalized Contract Cost    
Deferred contract costs, net 190 138
Contract origination costs on completed implementations, net    
Capitalized Contract Cost    
Deferred contract costs, net 374 352
Contract fulfillment costs on completed implementations, net    
Capitalized Contract Cost    
Deferred contract costs, net $ 185 $ 177