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ORGANIZATION AND BASIS OF PRESENTATION - Narrative (Details) $ in Millions |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 25, 2024 USD ($) promissoryNote | May 31, 2022 USD ($) | Mar. 31, 2024 USD ($) mi² customer transmissionCenter MW | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Feb. 02, 2023 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of customers | customer |  |  | 6,000,000 |  |  |
Number of regional transmission centers | transmissionCenter |  |  | 2 |  |  |
carrying value of the NCI |  |  | $ 2,673 |  |  |
Capitalized cost of equity |  |  | 13 | $ 8 |  |
Capitalized interest |  |  | 17 | 13 |  |
Equity method investment earnings (Note 1) |  |  | 21 | 56 |  |
NCI |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
carrying value of the NCI |  |  | 731 |  |  |
OPIC |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
carrying value of the NCI |  |  | $ 1,942 |  |  |
Distribution Segment |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of customers | customer |  |  | 4,200,000 |  |  |
Plant capacity (in MW's) | MW |  |  | 3,599 |  |  |
Regulated Transmission |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Service area | mi² |  |  | 24,000 |  |  |
FET |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners |  |  | 49.90% |  |  |
FET |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Net of transaction costs |  | $ 30 |  |  |  |
Net of taxes |  | $ 797 |  |  |  |
FE PA |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of customers | customer |  |  | 4,500,000 |  |  |
North American Transmission Company II LLC | FET |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Sale of ownership interest by parent |  |  |  |  |  | 30.00%
Number of promissory notes | promissoryNote | 2 |  |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners |  |  |  |  |  | 49.90%
North American Transmission Company II LLC | FET |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Sale of ownership interest by parent | 49.90% | 19.90% |  |  |  |
Consideration |  |  |  |  |  | $ 3,500
North American Transmission Company II LLC | Brookfield | FET |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Business combination, consideration transferred, liabilities incurred | $ 1,200 |  |  |  |  |
Cash paid in acquisition | 2,300 |  |  |  |  |
North American Transmission Company II LLC | Brookfield | FET | Promissory Note, $750 Million at 5.575% Due September 2025 |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Face amount of debt | $ 750 |  |  |  |  |
Issuance interest rate | 5.75% |  |  |  |  |
North American Transmission Company II LLC | Brookfield | FET | Promissory Note, $450 Million at 7.75% Due September 2025 |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Face amount of debt | $ 450 |  |  |  |  |
Issuance interest rate | 7.75% |  |  |  |  |
Global Holding |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Equity method investments |  |  | $ 87 |  | $ 66 |
Global Holding | FEV |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Investment ownership percentage |  |  | 33.30% |  |  |
Global Holding | FEV | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Proceeds from dividends received |  |  |  | 60 |  |
Global Holding | FEV | Corporate and Other | Other Nonoperating Income (Expense) |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Equity method investment earnings (Note 1) |  |  | $ 21 | $ 54 |  |
FET | FE |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  | 50.10%
Other Sundry Investments |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Equity method investments |  |  | 126 |  | 104 |
Path Wv | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Equity method investments |  |  | $ 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% |  |  |
Variable interest entities percentage of high voltage transmission line project owned by variable interest entity one in joint venture party two |  |  | 50.00% |  |  |

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