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INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred Tax Assets and Liabilities |  |
Deferred Tax Assets, debt | $ 3 | $ 176
Deferred Tax Assets, property, plant and equipment differences | 209 | 0
Deferred Tax Assets, postretirement benefit accruals | 43 | 40
Deferred Tax Assets, deferred compensation and benefits | 23 | 55
Deferred Tax Assets, asset retirement obligations | 178 | 155
Deferred Tax Assets, net operating loss carryforwards and credits | 12 | 457
Deferred Tax Asset, business interest expense carryforward | 180 | 194
Deferred Tax Assets, investment in partnerships | 0 | 110
Deferred Tax Assets, other | 34 | 36
Deferred Tax Assets, subtotal | 682 | 1,223
Deferred Tax Assets, valuation allowance | (549) | (646)
Deferred Tax Assets, Net of valuation allowance | 133 | 577
Deferred Tax Liabilities, property, plant and equipment differences | (113) | (517)
Deferred Tax Liabilities, all other | (20) | (60)
Deferred Tax Liabilities, total net deferred taxes | $ (133) | $ (577)

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