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STOCK BASED COMPENSATION - Stock Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock based compensation expense | $ 11 | $ 12
Total stock based compensation capitalized | 1 | 0
Cost of providing services |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock based compensation expense | 3 | 3
Sales and marketing |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock based compensation expense | 2 | 1
General and administrative |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock based compensation expense | 5 | 7
Systems development and programming costs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock based compensation expense | $ 1 | $ 1

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