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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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