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Organization and Basis of Presentation (Details) customer in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) company agreement transmission_center MW | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) company agreement customer transmission_center mi MW | Sep. 30, 2019 USD ($) | Nov. 17, 2020 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |
Length of transmission lines | mi |  |  | 24,500 |  |
Number of regional transmission centers | transmission_center | 2 |  | 2 |  |
Capitalized cost of equity | $ 13,000,000 | $ 12,000,000 | $ 36,000,000 | $ 34,000,000 |
Capitalized interest | 8,000,000 | $ 7,000,000 | 21,000,000 | $ 19,000,000 |
Incremental increase to uncollectible expense due to Covid-19 | 20,000,000 |  | 63,000,000 |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Maximum amount borrowed under revolving credit facility | $ 3,500,000,000 |  | $ 3,500,000,000 |  |
Number of agreements | agreement | 2 |  | 2 |  |
Revolving Credit Facility | Line of Credit | FirstEnergy |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Maximum amount borrowed under revolving credit facility | $ 2,500,000,000 |  | $ 2,500,000,000 |  |
Revolving Credit Facility | Line of Credit | FirstEnergy | Subsequent Event |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Maximum amount borrowed under revolving credit facility |  |  |  |  | $ 1,500,000,000
Revolving Credit Facility | Line of Credit | FET Sub-limits |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Maximum amount borrowed under revolving credit facility | 1,000,000,000.0 |  | $ 1,000,000,000.0 |  |
Revolving Credit Facility | Line of Credit | Parent, the Utilities, FET and Certain Subsidiaries [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Debt term |  |  | 5 years |  |
Future Recovery of Incremental Costs |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Incremental increase to uncollectible expense due to Covid-19 | $ 13,000,000 |  | $ 40,000,000 |  |
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 |  |
Plant capacity (in MW's) | MW | 3,790 |  | 3,790 |  |
Regulated Distribution | Yard Creek Generating Plant |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Plant capacity (in MW's) | MW | 210 |  | 210 |  |

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