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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)