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Restructuring Activities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]        
Restructuring and related cost, cost incurred to date $ 80   $ 80  
Charges $ 0 $ 1 $ 0 $ 74
Cost of revenue, excluding technology costs        
Restructuring Cost and Reserve [Line Items]        
Charges       22
Technology costs        
Restructuring Cost and Reserve [Line Items]        
Charges       32
Selling, general and administrative costs        
Restructuring Cost and Reserve [Line Items]        
Charges       $ 20