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INCOME TAXES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |  |  |  |
Benefit from income taxes | $ (25) | $ (5) | $ 36 | $ 133 |
Income tax benefit on ordinary loss |  |  | 34 | 28 |
Income tax benefit for discrete items |  |  | 2 | 105 |
Income tax benefit for legal settlements |  |  | 54 |  |
Provision related to withholding tax, intercompany dividends |  |  | 46 |  |
Tax provision (benefit) related to changes in uncertain tax positions |  |  | 11 | (10) |
Tax benefit related to stock compensation |  |  | 8 | 7 |
Provision related to filing certain tax returns |  |  | 3 | 11 |
Tax benefit related to release of valuation allowance |  |  |  | 63 |
Tax benefit related to change in law |  |  |  | $ 36 |
Valuation allowance against deferred tax assets | 2,218 |  | 2,218 |  | $ 2,252
Unrecognized tax benefits including interest and penalties | 1,117 |  | 1,117 |  | 1,025
Unrecognized tax benefits related to interest and penalties | 53 |  | 53 |  | $ 49
Portion of unrecognized tax benefits, if recognized, would reduce the Company's effective tax rate | 550 |  | 550 |  |
Unrecognized tax benefit, amount possible to decrease in next twelve months | $ 194 |  | 194 |  |
Estimate of possible loss, income tax examination (up to) |  |  | $ 2,100 |  |

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