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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% |  |  |

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