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ORGANIZATION AND BASIS OF PRESENTATION (Details) mi in Thousands, customer in Millions, $ in Millions |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2022 USD ($) | Sep. 30, 2023 USD ($) company transmissionCenter MW | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) company customer transmissionCenter mi MW | Sep. 30, 2022 USD ($) | Apr. 27, 2023 USD ($) | Feb. 02, 2023 USD ($) director | Dec. 31, 2022 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Length of transmission lines | mi |  |  |  | 24 |  |  |  |
Number of regional transmission centers | transmissionCenter |  | 2 |  | 2 |  |  |  |
Capitalized cost of equity |  | $ 12 | $ 15 | $ 31 | $ 39 |  |  |
Capitalized interest |  | 14 | 8 | 38 | 20 |  |  |
Equity method investment earnings (Note 1) |  | 43 | 57 | 134 | 134 |  |  |
Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Deferred tax assets, valuation allowance |  | $ 21 |  | $ 21 |  |  |  |
Regulated Distribution |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Number Of existing utility operating companies | company |  | 10 |  | 10 |  |  |  |
Number of customers | 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% |
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 | FE |  |  |  |  |  |  |  |
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 |
Number of directors | director |  |  |  |  |  |  | 2 |
Minimum ownership interest |  |  |  |  |  |  | 30.00% |
Global Holding | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Equity method investments |  | $ 54 |  | $ 54 |  |  |  | $ 57
Global Holding | FEV |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Investment ownership percentage |  | 33.30% |  | 33.30% |  |  |  |
Global Holding | FEV | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Proceeds from dividends received |  |  |  | $ 135 | 120 |  |  |
Global Holding | FEV | Corporate and Other | Other Nonoperating Income (Expense) |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Equity method investment earnings (Note 1) |  | $ 43 | $ 57 | 132 | $ 133 |  |  |
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
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% |  |  |  |

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