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INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Income Tax Disclosure [Abstract] |  |
Income before income taxes | $ 402 | $ 400
Federal income tax expense at statutory rate (21%) | 84 | 84
Increases (reductions) in tax expense resulting from: |  |
State and municipal income taxes, net of federal tax benefit | 23 | 14
AFUDC equity and other flow-through | (7) | (5)
Deferred taxes related to sale of equity interest in FET, net | 7 | 0
Excess deferred tax amortization due to the Tax Act | (13) | (16)
Valuation allowances | 39 | 9
Other, net | 2 | 4
Total income taxes | $ 135 | $ 90
Effective income tax rate | 33.60% | 22.50%

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