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Stock Based Compensation - Stock Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock based compensation expense | $ 11 | $ 11 | $ 20 | $ 20
Cost of providing services |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock based compensation expense | 3 | 2 | 5 | 4
Sales and marketing |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock based compensation expense | 1 | 1 | 3 | 1
General and administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock based compensation expense | 6 | 7 | 11 | 13
Systems development and programming costs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock based compensation expense | $ 1 | $ 1 | $ 1 | $ 2

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