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Organization and Basis of Presentation - Narrative (Details) mi in Thousands, customer in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 18, 2021 USD ($) agreement | Sep. 30, 2021 USD ($) company transmissionCenter MW | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) company customer transmissionCenter mi MW | Sep. 30, 2020 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 |  | $ 13,000,000 | $ 13,000,000 | $ 34,000,000 | $ 36,000,000
Capitalized interest |  | $ 7,000,000 | $ 8,000,000 | $ 20,000,000 | $ 21,000,000
Revolving Credit Facility | Line of Credit | Subsequent Event |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Number of agreements | agreement | 6 |  |  |  |
Maximum amount borrowed under revolving credit facility | $ 4,500,000,000 |  |  |  |
Revolving Credit Facility | Line of Credit | First Energy and FET | Subsequent Event |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Maximum amount borrowed under revolving credit facility | $ 1,000,000,000 |  |  |  |
PN | Waverly, New York |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Number of customers served by utility operating companies | customer |  |  |  | 4 |
Parent, the Utilities, FET and Certain Subsidiaries | Revolving Credit Facility | Line of Credit | Subsequent Event |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Debt term | 5 years |  |  |  |
The Ohio Companies | Revolving Credit Facility | Line of Credit | Subsequent Event |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Maximum amount borrowed under revolving credit facility | $ 800,000,000 |  |  |  |
The Pennsylvania Companies | Revolving Credit Facility | Line of Credit | Subsequent Event |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Maximum amount borrowed under revolving credit facility | 950,000,000 |  |  |  |
JCP&L | Revolving Credit Facility | Line of Credit | Subsequent Event |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Maximum amount borrowed under revolving credit facility | 500,000,000 |  |  |  |
MP and PE | Revolving Credit Facility | Line of Credit | Subsequent Event |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Maximum amount borrowed under revolving credit facility | 400,000,000 |  |  |  |
Transmission Companies | Revolving Credit Facility | Line of Credit | Subsequent Event |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Maximum amount borrowed under revolving credit facility | $ 850,000,000 |  |  |  |
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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