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TAXES - Accumulated Deferred Income Taxes (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |  |  |
Property basis differences | $ 5,528 | $ 5,670 |  |
Pension and OPEB | (496) | (570) |  |
AROs | (22) | (21) |  |
Regulatory asset/liability | 432 | 322 |  |
Deferred compensation | (149) | (155) |  |
Deferred gain on 19.9% FET minority interest sale | 752 | 0 |  |
Loss carryforwards and tax credits | (2,073) | (2,040) |  |
Valuation reserve | 440 | 484 | $ 496 | $ 441
All other | (210) | (253) |  |
Net deferred income tax liability | $ 4,202 | $ 3,437 |  |

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