ORGANIZATION AND BASIS OF PRESENTATION - Narrative (Details) $ in Millions			12 Months Ended
	Feb. 02, 2023 USD ($) director	May 31, 2022 USD ($) director	Dec. 31, 2022 USD ($) mi² entity company customer agreement transmissionCenter MW	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2013 USD ($)
Regulatory Assets [Line Items]
Number of regional transmission centers | transmissionCenter			2
Regulatory assets currently being recovered through deferred returns			$ 464	$ 228
Investments (Note 9)			622	655
Equity method investment earnings (Note 1)			$ 168	$ 31	$ 2
Number of contracts that may contain variable interest | entity			1
Public utilities, property, plant and equipment, disclosure of composite depreciation rate for plants in service			2.70%	2.70%	2.70%
Capitalized financing costs			$ 56	$ 48	$ 49
Interest costs capitalized			28	27	28
Property, plant and equipment			$ 36,285	34,744
Brookfield II | FET | Subsequent Event
Regulatory Assets [Line Items]
Sale of ownership interest by parent	30.00%
Noncontrolling interest ownership percentage	49.90%
Power Purchase Agreements
Regulatory Assets [Line Items]
Number of long term power purchase agreements maintained by parent company with Non utility generation entities | agreement			6
Utilities and Transmission Companies
Regulatory Assets [Line Items]
Number of existing utility operating companies | company			10
Number of customers served by utility operating companies | customer			6,000,000
Number of square miles in service area | mi²			65,000
Plant generation capacity (in MW's) | MW			3,580
Property, plant and equipment, net			$ 2,200
Regulated Transmission
Regulatory Assets [Line Items]
Number of square miles in service area | mi²			24,000
Global Holding
Regulatory Assets [Line Items]
Equity method investments			$ 57	59
Path-WV | Variable Interest Entity, Not Primary Beneficiary
Regulatory Assets [Line Items]
Equity method investments			$ 18	18
Percentage of high-voltage transmission line project owned by subsidiary of FE on the Allegheny Series			100.00%
Variable Interest Entities Percentage Of high voltage transmission line project owned By variable interest entity one in joint venture party two			50.00%
Global Holding And PATH WV | Power Purchase Agreements
Regulatory Assets [Line Items]
Ownership interest			0.00%
FET | FE | Subsequent Event
Regulatory Assets [Line Items]
Ownership interest	50.10%
Other Sundry Investments
Regulatory Assets [Line Items]
Equity method investments			$ 90	88
FEV | Global Holding
Regulatory Assets [Line Items]
Proceeds from dividends received			$ 170
FEV | Global Holding | Signal Peak
Regulatory Assets [Line Items]
Ownership interest			33.33%
FEV | Global Holding | Other Nonoperating Income (Expense) | Corporate/Other
Regulatory Assets [Line Items]
Equity method investment earnings (Note 1)			$ 168	29	2
Ohio Funding Companies | Phase In Recovery Bonds
Regulatory Assets [Line Items]
Face amount of loan						$ 445
Other FE subsidiaries | Power Purchase Agreements
Regulatory Assets [Line Items]
Purchased power			$ 119	$ 111	$ 113
FET
Regulatory Assets [Line Items]
Debt covenants minimum ownership interest percentage		9.90%
Consolidation, less than wholly owned subsidiary, parent ownership interest, changes, transaction costs		$ 37
Consolidation, less than wholly owned subsidiary, parent ownership interest, changes, carrying value of noncontrolling interest		$ 451
Number of directors | director		5
Debt-to-Capital terms included in sale for the first 5 years		65.00%
Debt-to-Capital terms included in sale for thereafter		70.00%
FET | Subsequent Event
Regulatory Assets [Line Items]
Number of directors | director	5
FET | Brookfield II
Regulatory Assets [Line Items]
Sale of ownership interest by parent		19.90%
Sale of ownership interest by parent		$ 2,375
Number of directors | director		1
FET | Brookfield II | Subsequent Event
Regulatory Assets [Line Items]
Consideration	$ 3,500
Debt covenants minimum ownership interest percentage	30.00%
Number of directors | director	2
Liabilities incurred	$ 1,750
FET | FE
Regulatory Assets [Line Items]
Number of directors | director		4
FET | FE | Subsequent Event
Regulatory Assets [Line Items]
Number of directors | director	3
Waverly, New York | PN
Regulatory Assets [Line Items]
Number of customers served by utility operating companies | customer			4,000
VIRGINIA
Regulatory Assets [Line Items]
Plant generation capacity (in MW's) | MW			3,003
VIRGINIA | AGC
Regulatory Assets [Line Items]
Plant generation capacity (in MW's) | MW			487
Proportionate ownership share			16.25%
Property, plant and equipment			$ 153
VIRGINIA | Virginia Electric and Power Company
Regulatory Assets [Line Items]
Proportionate ownership share			60.00%