TAXES - Reconciliation of Federal Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	May 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	$ 1,439	$ 1,559	$ 1,129
Federal income tax expense at statutory rate (21%)	302	327	237
Increases (reductions) in taxes resulting from-
State and municipal income taxes, net of federal tax benefit	56	122	75
AFUDC equity and other flow-through	(26)	(29)	(38)
Amortization of investment tax credits	(4)	(4)	(14)
Deferred gain on 19.9% FET minority interest sale	752	0	0
Federal tax credits claimed	(3)	(34)	0
Nondeductible DPA monetary penalty	0	52	0
Excess deferred tax amortization due to the Tax Act	(51)	(54)	(56)
TMI-2 reversal of tax regulatory liabilities	0	0	(40)
Uncertain tax positions	2	(82)	(1)
Valuation allowances	(47)	17	(49)
Other, net	19	5	12
Total income taxes	$ 1,000	$ 320	$ 126
Effective income tax rate (percent)	69.50%	20.50%	11.20%
Brookfield II | FET
Provision for Income Tax [Line Items]
Sale of ownership interest by parent				19.90%