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Organization and Basis of Presentation - Narrative (Details) mi in Thousands, employee in Thousands, customer in Thousands, $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 31, 2022 USD ($) director | Jun. 30, 2022 USD ($) employee company transmissionCenter MW | Mar. 31, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) employee customer company transmissionCenter mi MW | Jun. 30, 2021 USD ($)
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 |  | $ 14 | $ 24 | $ 21
Capitalized interest |  | $ 6 |  | $ 7 | $ 12 | $ 13
Incremental decrease to uncollectible expense due to Covid-19 |  |  | $ 25 |  |  |
Number Of Employees Working Remotely | employee |  | 7 |  |  | 7 |
Deferred Regulatory Assets |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Incremental decrease to uncollectible expense due to Covid-19 |  |  | $ 15 |  |  |
PN | Waverly, New York |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of customers served by utility operating companies | customer |  |  |  |  | 4 |
FET |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Transaction costs | $ 37 |  |  |  |  |
Changes in carrying value of noncontrolling interest | $ 451 |  |  |  |  |
Number of directors | director | 5 |  |  |  |  |
Minimum ownership interest | 9.90% |  |  |  |  |
Year one through five required debt to equity percentage | 65.00% |  |  |  |  |
Required debt to equity ratio thereafter | 70.00% |  |  |  |  |
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 |  |  |  |  |
Number of directors | director | 1 |  |  |  |  |
FET | FirstEnergy |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Number of directors | director | 4 |  |  |  |  |
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 |  |  |  |  | 6,000 |
Plant capacity (in MW's) | MW |  | 3,580 |  |  | 3,580 |

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