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ORGANIZATION AND BASIS OF PRESENTATION - Narrative (Details) customer in Millions, $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended |  |  |
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Jul. 17, 2024 USD ($) | Mar. 25, 2024 USD ($) promissoryNote | May 31, 2022 USD ($) | Dec. 31, 2024 USD ($) mi² transmissionCenter MW | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) mi² customer transmissionCenter MW | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2024 | Sep. 30, 2023 USD ($) | Feb. 02, 2023 USD ($) director
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  | 6.0 |  |  |  |  |
Number of regional transmission centers | transmissionCenter |  |  |  | 2 |  | 2 |  |  |  |  |
Impairment of long-lived assets to be disposed of |  |  |  |  | $ 62 |  |  |  |  |  |
FET equity interest sale, net of transaction costs |  |  |  |  |  | $ 2,665 |  | $ 2,338 |  |  |
Regulatory assets currently being recovered through deferred returns |  |  |  | $ 698 |  | 698 | $ 371 |  |  |  |
Equity method investment earnings, net (Note 1) |  |  |  |  |  | $ 58 | $ 175 | $ 168 |  |  |
Public utilities, property, plant and equipment, disclosure of composite depreciation rate for plants in service |  |  |  |  |  | 2.90% | 2.80% | 2.70% |  |  |
Capitalized financing costs |  |  |  |  |  | $ 60 | $ 44 | $ 56 |  |  |
Interest costs capitalized |  |  |  |  |  | $ 73 | 53 | 28 |  |  |
VIRGINIA |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Plant generation capacity (in MW's) | MW |  |  |  | 3,003 |  | 3,003 |  |  |  |  |
Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred tax assets, valuation allowance |  |  |  |  |  |  |  |  |  | $ 21 |
NCI |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
FET equity interest sale, net of transaction costs |  |  |  |  |  | $ 731 |  | 451 |  |  |
OPIC |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
FET equity interest sale, net of transaction costs |  |  |  |  |  | $ 1,934 |  | $ 1,887 |  |  |
FET |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest ownership percentage |  |  |  | 49.90% |  | 49.90% |  |  |  |  |
Brookfield II | FET |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of ownership interest by parent |  |  |  |  |  |  |  |  |  |  | 30.00%
Number of promissory notes | promissoryNote |  | 2 |  |  |  |  |  |  |  |  |
Noncontrolling interest ownership percentage |  |  |  |  |  |  |  |  |  |  | 49.90%
Integrated |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service area | mi² |  |  |  | 24,000 |  | 24,000 |  |  |  |  |
Integrated Segment |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Plant generation capacity (in MW's) | MW |  |  |  | 3,604 |  | 3,604 |  |  |  |  |
Integrated |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  | 2.0 |  |  |  |  |
Impairment of long-lived assets to be disposed of |  |  |  |  | 17 |  |  |  |  |  |
Distribution Segment |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  | 4.3 |  |  |  |  |
Plant generation capacity (in MW's) | MW |  |  |  | 3,604 |  | 3,604 |  |  |  |  |
Impairment of long-lived assets to be disposed of |  |  |  |  | 31 |  |  |  |  |  |
Property, plant and equipment, net |  |  |  | $ 2,300 |  | $ 2,300 |  |  |  |  |
Stand-Alone Transmission |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets to be disposed of |  |  |  |  | 11 |  |  |  |  |  |
Corporate/Other |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets to be disposed of |  |  |  |  | $ 3 |  |  |  |  |  |
FET |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net of transaction costs |  |  | $ 37 |  |  | 32 |  |  |  |  |
Net of taxes |  |  |  |  |  | $ 803 |  |  |  |  |
Number of directors | director |  |  |  |  |  |  |  |  |  |  | 5
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 |  |  |  |  |  |  |  |  |  |  | 3
FET | Brookfield II |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of ownership interest by parent |  | 49.90% | 19.90% | 19.90% |  | 19.90% |  | 19.90% | 19.90% |  |
Consideration |  |  |  |  |  |  |  |  |  |  | $ 3,500
Number of directors | director |  |  |  |  |  |  |  |  |  |  | 2
Brookfield | Brookfield II |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income, operating |  |  |  |  |  | $ 24 |  |  |  |  |
Brookfield | Brookfield II | FET |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Liabilities incurred | $ 1,200 | $ 1,200 |  |  |  |  |  |  |  |  |
Payments to acquire businesses, gross |  |  |  |  |  | $ 2,300 |  |  |  |  |
Brookfield | Brookfield II | FET | Promissory Note, $750 Million at 5.75% Due September 2025 |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  | $ 750 |  |  |  |  |  |  |  |  |
Interest rate (percent) |  | 5.75% |  |  |  |  |  |  |  |  |
Brookfield | Brookfield II | FET | Promissory Note, $450 Million at 7.75% Due September 2025 |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  | $ 450 |  |  |  |  |  |  |  |  |
Interest rate (percent) |  | 7.75% |  |  |  |  |  |  |  |  |
AGC | VIRGINIA |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Plant generation capacity (in MW's) | MW |  |  |  | 487 |  | 487 |  |  |  |  |
Proportionate ownership share |  |  |  | 16.25% |  | 16.25% |  |  |  |  |
Property, plant and equipment |  |  |  | $ 142 |  | $ 142 |  |  |  |  |
Virginia Electric and Power Company | VIRGINIA |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proportionate ownership share |  |  |  | 60.00% |  | 60.00% |  |  |  |  |
FET | FE |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  | 50.10%
Global Holding |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  | $ 45 |  | $ 45 | 66 |  |  |  |
Global Holding | FEV | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from dividends received |  |  |  |  |  | 80 | 165 |  |  |  |
Global Holding | FEV | Corporate/Other | Other Nonoperating Income (Expense) |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investment earnings, net (Note 1) |  |  |  |  |  | 72 | 175 | $ 168 |  |  |
Other Sundry Investments |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  | 84 |  | 84 | 104 |  |  |  |
Path-WV | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  | $ 17 |  | $ 17 | $ 17 |  |  |  |
Variable interest entities percentage of high voltage transmission line project owned by variable interest entity one in joint venture party one |  |  |  | 100.00% |  | 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% |  | 50.00% |  |  |  |  |
Signal Peak |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of equity method investments |  |  |  | $ 13 |  |  |  |  |  |  |
Signal Peak | Global Holding | FEV |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  | 33.33% |  | 33.33% |  |  |  |  |

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