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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

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