TAXES - Narrative (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Jul. 08, 2022	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2024	May 31, 2022
Provision for Income Tax [Line Items]
Operating loss carryforwards, subject to expiration		$ 7,100	$ 7,100
Nondeductible DPA monetary penalty		752
Valuation allowances			(47)	$ 17	$ (49)
Excess deferred tax amortization due to the Tax Act			(51)	(54)	(56)
Income taxes (benefits)			1,000	$ 320	$ 126
Operating loss carryforwards, subject to expiration, net of tax		1,500	1,500
Operating loss carryforwards, not subject to expiration		5,000	5,000
Operating loss carryforwards, not subject to expiration, net of tax		1,000	1,000
General business tax credits		51	51
Unrecognized tax benefits that would impact future tax rates		41	41
Unrecognized tax benefits, portion expected to be resolved in the next fiscal year		25	25
Unrecognized tax benefits that would impact effective tax rate		24	24
State and Local
Provision for Income Tax [Line Items]
Valuation allowances		54
Operating loss carryforwards, not subject to expiration		12,600	12,600
Operating loss carryforwards, not subject to expiration, net of tax		568	568
Pre-tax net operating loss carryforwards expected to utilized		3,900	3,900
Operating loss carryforwards expected to utilized, net of tax		$ 199	199
Tax Years 2018 and 2019
Provision for Income Tax [Line Items]
Valuation allowances			$ 38
Brookfield II | FET
Provision for Income Tax [Line Items]
Sale of ownership interest by parent							19.90%
Brookfield II | FET | Forecast
Provision for Income Tax [Line Items]
Sale of ownership interest by parent						30.00%
Operating loss carryforwards, subject to expiration						$ 7,100
Equity interest rate of combined sale						49.90%
Consideration						$ 3,500
Pennsylvania
Provision for Income Tax [Line Items]
Excess deferred tax amortization due to the Tax Act	$ 230
Increase (decrease) in regulatory liabilities	236
Income taxes (benefits)	$ 6