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INCOME TAXES - Reconciliation of Federal Income Tax Expense (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Income Tax Disclosure [Abstract] |  |
Income before income taxes | $ 400 | $ 371
Federal income tax expense at statutory rate (21%) | 84 | 78
Increases (reductions) in tax expense resulting from: |  |
State income taxes, net of federal tax benefit | 14 | 26
AFUDC equity and other flow-through | (5) | (8)
Excess deferred tax amortization due to the Tax Act | (16) | (15)
Valuation allowances | 9 | 34
Remeasurement of state deferred taxes | 0 | (26)
Other, net | 4 | (6)
Total income taxes | $ 90 | $ 83
Effective income tax rate | 22.50% | 22.40%

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