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EQUITY - TOTAL STOCK BASED COMPENSATION EXPENSE AND THE TAX RELATED BENEFIT (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity [Abstract] |  |  |
Stock option expense | $ 7 | $ 7 | $ 7
RSU expense | 39 | 58 | 13
Total stock based compensation expense | 46 | 65 | 20
Related deferred income tax benefit | $ 5 | $ 8 | $ 2

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