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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%

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