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STOCK BASED COMPENSATION - Stock Based Compensation Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Additional Disclosures for equity-based plans |  |  |
Total stock based compensation expense | $ 43 | $ 41 | $ 44
Total stock based compensation capitalized | 1 | 1 | 0
Income tax benefit related to stock based compensation expense | 9 | 11 | 11
Tax benefit realized from stock options exercised and similar awards | 14 | 18 | 23
Cost of providing services |  |  |
Additional Disclosures for equity-based plans |  |  |
Total stock based compensation expense | 9 | 8 | 10
Sales and marketing |  |  |
Additional Disclosures for equity-based plans |  |  |
Total stock based compensation expense | 6 | 3 | 8
General and administrative |  |  |
Additional Disclosures for equity-based plans |  |  |
Total stock based compensation expense | 26 | 28 | 22
Systems development and programming costs |  |  |
Additional Disclosures for equity-based plans |  |  |
Total stock based compensation expense | $ 2 | $ 2 | $ 4

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