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v3.22.1

Organization and Basis of Presentation - Narrative (Details) mi in Thousands, customer in Thousands, $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Apr. 14, 2022 USD ($) | Mar. 31, 2022 USD ($) customer company transmissionCenter mi MW | Mar. 31, 2021 USD ($) | Apr. 30, 2022 director
Property, Plant and Equipment [Line Items] |  |  |  |
Length of transmission lines | mi |  | 24 |  |
Number of regional transmission centers | transmissionCenter |  | 2 |  |
Capitalized cost of equity |  | $ 13 | $ 7 |
Capitalized interest |  | 6 | $ 6 |
Incremental decrease to uncollectible expense due to Covid-19 |  | 25 |  |
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 | Forecast |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
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 | Forecast |  |  |  |
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 | Forecast |  |  |  |
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 |  |
Number of customers served by utility operating companies | customer |  | 6,000 |  |
Plant capacity (in MW's) | MW |  | 3,580 |  |

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