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INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Components of Deferred Tax Assets [Abstract] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards | $ 1,236 | $ 795 |  |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions | 228 | 114 |  |
Deferred Tax Assets, Property, Plant and Equipment | 0 | 1 |  |
Deferred Tax Assets, State Taxes | 132 | 71 |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other | 190 | 70 |  |
Deferred Tax Assets, Gross | 1,786 | 1,051 |  |
Deferred Tax Assets, Valuation Allowance | (836) | (441) | $ (1,287) | $ (1,983)
Deferred Tax Assets, Net of Valuation Allowance | 950 | 610 |  |
Components of Deferred Tax Liabilities [Abstract] |  |  |  |
Deferred Tax Liabilities Investment In Ventures | (144) | (137) |  |
Deferred Tax Liabilities, Property, Plant and Equipment | 246 | 0 |  |
Deferred Tax Liabilities Other Assets | (68) | (14) |  |
Deferred Tax Liabilities, Net | (458) | (151) |  |
Deferred Tax Assets, Net | $ 492 | $ 459 |  |

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