ORGANIZATION AND BASIS OF PRESENTATION - Narrative (Details) $ in Millions		12 Months Ended
	May 31, 2022 USD ($) director	Dec. 31, 2023 USD ($) mi² transmissionCenter customer MW	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Apr. 27, 2023 USD ($)	Feb. 02, 2023 USD ($) director
Regulatory Assets [Line Items]
Number of regional transmission centers | transmissionCenter		2
Regulatory assets currently being recovered through deferred returns		$ 371	$ 511
Equity method investment earnings (Note 1)		$ 175	$ 168	$ 31
Public utilities, property, plant and equipment, disclosure of composite depreciation rate for plants in service		2.80%	2.70%	2.70%
Capitalized financing costs		$ 44	$ 56	$ 48
Interest costs capitalized		53	28	27
Property, plant and equipment		$ 38,412	36,285
VIRGINIA
Regulatory Assets [Line Items]
Plant generation capacity (in MW's) | MW		3,003
Utilities and Transmission Companies
Regulatory Assets [Line Items]
Number of customers | customer		6,000,000
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]
Service Area | mi²		24,000
Other Sundry Investments
Regulatory Assets [Line Items]
Equity method investments		$ 104	90
Global Holding
Regulatory Assets [Line Items]
Equity method investments		66	57
FE | FET
Regulatory Assets [Line Items]
Equity method investment, ownership percentage						50.10%
Variable Interest Entity, Not Primary Beneficiary | Path-WV
Regulatory Assets [Line Items]
Equity method investments		17	18
Equity method investment earnings (Note 1)		$ 0	0	0
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%
FET
Regulatory Assets [Line Items]
Number of directors | director	5					5
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
FET | FE
Regulatory Assets [Line Items]
Number of directors | director	4					3
FEV | Global Holding
Regulatory Assets [Line Items]
Proceeds from dividends received		$ 165	170
FEV | Global Holding | Signal Peak [Member]
Regulatory Assets [Line Items]
Equity method investment, ownership percentage		33.33%
FEV | Global Holding | Other Nonoperating Income (Expense) | Corporate/Other
Regulatory Assets [Line Items]
Equity method investment earnings (Note 1)		$ 175	$ 168	$ 29
AGC | VIRGINIA
Regulatory Assets [Line Items]
Plant generation capacity (in MW's) | MW		487
Proportionate ownership share		16.25%
Property, plant and equipment		$ 145
Virginia Electric and Power Company | VIRGINIA
Regulatory Assets [Line Items]
Proportionate ownership share		60.00%
FET
Regulatory Assets [Line Items]
Noncontrolling interest ownership percentage		19.90%				49.90%
Brookfield II | FET
Regulatory Assets [Line Items]
Number of directors | director	1					2
Debt covenants minimum ownership interest percentage						30.00%
Sale of ownership interest by parent	19.90%	19.90%
Consideration					$ 3,500	$ 3,500
Brookfield II | FET
Regulatory Assets [Line Items]
Sale of ownership interest by parent					30.00%	30.00%
Noncontrolling interest ownership percentage						49.90%