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TAXES - Reconciliation of Federal Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of federal income tax expense at the federal statutory rate to the total provision for income taxes      
Income from continuing operations, before income taxes $ 1,504 $ 1,464 $ 1,439
Federal income tax expense at the 21% statutory rate 316 307 302
Increases (reductions) in taxes resulting from-      
State and municipal income taxes, net of federal tax benefit 140 80 56
AFUDC equity and other flow-through (30) (30) (26)
Amortization of investment tax credits (4) (3) (4)
Deductions associated with certain equity method investments (19) 0 0
Taxes related to the combined sale of 49.9% of the equity interests of FET 6 58 752
Federal tax credits claimed (2) (3) (3)
Tax on distributions from FET 16 0 0
Excess deferred tax amortization due to the Tax Act (52) (46) (51)
Nondeductible SEC and OAG settlements 27 0 0
Remeasurement of excess deferred income taxes (43) 0 0
Uncertain tax positions 0 41 2
Valuation allowances 16 (146) (47)
Other, net 6 9 19
Total income taxes on income from continuing operations $ 377 $ 267 $ 1,000
Effective income tax rate (percent) 25.10% 18.20% 69.50%