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INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Income Tax Disclosure [Abstract] |  |  |  |
Income before income taxes | $ 560 | $ 470 | $ 1,125 | $ 1,198
Federal income tax expense at statutory rate (21%) | 118 | 99 | 236 | 252
Increases (reductions) in tax expense resulting from: |  |  |  |
State and municipal income taxes, net of federal tax benefit | 33 | 25 | 76 | 49
AFUDC equity and other flow-through | (6) | (15) | (19) | (25)
Deductions associated with certain equity method investments | (14) | 0 | (14) | 0
Deferred taxes related to sale of equity interest in FET, net | 0 | 0 | 7 | 0
Excess deferred tax amortization due to the Tax Act | (13) | 2 | (40) | (30)
Federal tax credits claimed | 0 | (2) | 0 | (2)
Nondeductible SEC and OOCIC settlements | 0 | 0 | 27 | 0
Remeasurement of excess deferred taxes | (21) | 0 | (21) | 0
Uncertain tax positions | 0 | 50 | 0 | 50
Valuation allowances | (3) | (122) | 33 | (113)
Other, net | 0 | (8) | 9 | 12
Total income taxes | $ 94 | $ 29 | $ 294 | $ 193
Effective income tax rate | 16.80% | 6.20% | 26.10% | 16.10%

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