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Deferred Contract Costs
 12 Months Ended
Dec. 31, 2020
Capitalized Contract Cost [Abstract]  
Deferred Contract Costs Deferred Contract Costs
Origination and fulfillment costs from contracts with customers capitalized as of December 31, 2020 and 2019, consist of the following (in millions):
 20202019
Contract costs on implementations in progress$245 $138 
Contract origination costs on completed implementations, net470 352 
Contract fulfillment costs on completed implementations, net202 177 
Total Deferred contract costs, net$917 $667 

For the years ended December 31, 2020, 2019 and 2018, amortization of deferred contract costs on completed implementations was $225 million, $184 million and $123 million.