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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Income Tax Disclosure [Abstract] |  |  |  |
Income before income taxes (continuing operations) | $ 470 | $ 449 | $ 1,198 | $ 1,061
Federal income tax expense at statutory rate (21%) | 99 | 94 | 252 | 223
Increases (reductions) in tax expense resulting from: |  |  |  |
State income taxes, net of federal tax benefit | 25 | 25 | 49 | 68
AFUDC equity and other flow-through | (15) | (8) | (25) | (23)
Excess deferred tax amortization due to the Tax Act | 2 | (15) | (30) | (46)
Federal tax credits claimed | (2) | (3) | (2) | (3)
Valuation allowances | (122) | (8) | (113) | 26
Remeasurement of state deferred taxes due to law changes | 0 | 4 | 0 | (22)
Uncertain tax positions | 50 | 2 | 50 | 2
Other, net | (8) | 14 | 12 | 12
Total income taxes (continuing operations) | $ 29 | $ 105 | $ 193 | $ 237
Effective income tax rate (continuing operations) | 6.00% | 23.40% | 16.10% | 22.30%

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