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STOCK BASED COMPENSATION - Stock Based Compensation Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Additional Disclosures for equity-based plans |  |  |
Total stock based compensation expense | $ 50 | $ 43 | $ 41
Total stock based compensation capitalized | 1 | 1 | 1
Income tax benefit related to stock based compensation expense | 10 | 9 | 11
Tax benefit realized from stock options exercised and similar awards | 16 | 14 | 18
Cost of providing services |  |  |
Additional Disclosures for equity-based plans |  |  |
Total stock based compensation expense | 12 | 9 | 8
Sales and marketing |  |  |
Additional Disclosures for equity-based plans |  |  |
Total stock based compensation expense | 6 | 6 | 3
General and administrative |  |  |
Additional Disclosures for equity-based plans |  |  |
Total stock based compensation expense | 29 | 26 | 28
Systems development and programming costs |  |  |
Additional Disclosures for equity-based plans |  |  |
Total stock based compensation expense | $ 3 | $ 2 | $ 2

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