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Stock Based Compensation - Stock Based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock based compensation expense $ 11 $ 9 $ 31 $ 29
Total stock based compensation capitalized 0 0 1 0
Cost of providing services        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock based compensation expense 2 2 7 6
Sales and marketing        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock based compensation expense 2 1 5 2
General and administrative        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock based compensation expense 6 5 17 19
Systems development and programming costs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock based compensation expense $ 1 $ 1 $ 2 $ 2