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ORGANIZATION AND BASIS OF PRESENTATION - Narrative (Details) mi in Thousands, customer in Millions, $ in Millions |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 02, 2023 USD ($) director | May 31, 2022 USD ($) | Jun. 30, 2023 USD ($) company transmissionCenter MW | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) company customer transmissionCenter mi MW | Jun. 30, 2022 USD ($) | Apr. 27, 2023 USD ($) | Dec. 31, 2022 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Length of transmission lines | mi |  |  |  |  | 24 |  |  |
Number of regional transmission centers | transmissionCenter |  |  | 2 |  | 2 |  |  |
Capitalized cost of equity |  |  | $ 11 | $ 11 | $ 19 | $ 24 |  |
Capitalized interest |  |  | 11 | 6 | 24 | 12 |  |
Equity method investment earnings |  |  | $ 35 | 65 | $ 91 | 77 |  |
Regulated Distribution |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of existing utility operating companies | company |  |  | 10 |  | 10 |  |  |
Number of customers served by utility operating companies | customer |  |  |  |  | 6 |  |  |
Plant capacity (in MW's) | MW |  |  | 3,580 |  | 3,580 |  |  |
North American Transmission Company II LLC | FET |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Sale of ownership interest by parent | 30.00% |  |  |  |  |  | 30.00% |
Noncontrolling interest, ownership percentage by noncontrolling owners | 49.90% |  |  |  |  |  |  |
Global Holding |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Equity method investments |  |  | $ 56 |  | $ 56 |  |  | $ 57
FET | FirstEnergy |  |  |  |  |  |  |  |
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 |  |  | 93 |  | 93 |  |  | 90
Path Wv | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Equity method investments |  |  | $ 18 |  | $ 18 |  |  | $ 18
Percentage of high-voltage transmission line project owned by subsidiary of FE on the Allegheny Series |  |  | 100.00% |  | 100.00% |  |  |
Percentage of high-voltage transmission line project owned by subsidiary of FE on the West Virginia Series |  |  | 50.00% |  | 50.00% |  |  |
FET |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net of transaction costs |  | $ 37 |  |  |  |  |  |
Carrying value of the noncontrolling interest |  | $ 451 |  |  |  |  |  |
Number of directors | director | 5 |  |  |  |  |  |  |
FET | FirstEnergy |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number of directors | director | 3 |  |  |  |  |  |  |
FET | North American Transmission Company II LLC |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Sale of ownership interest by parent |  | 19.90% |  |  |  |  |  |
Sale price of ownership interest by parent |  | $ 2,375 |  |  |  |  |  |
Disposal group, including discontinued operation, consideration | $ 3,500 |  |  |  |  |  | $ 3,500 |
Business combination, consideration transferred, liabilities incurred | $ 1,750 |  |  |  |  |  |  |
Number of directors | director | 2 |  |  |  |  |  |  |
Minimum ownership interest | 30.00% |  |  |  |  |  |  |
FEV | Global Holding |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Investment ownership percentage |  |  | 33.30% |  | 33.30% |  |  |
Proceeds from dividends received |  |  |  |  | $ 90 | 70 |  |
FEV | Global Holding | Corporate and Other | Other Nonoperating Income (Expense) |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Equity method investment earnings |  |  | $ 35 | $ 64 | $ 89 | $ 76 |  |

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