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Organization and Basis of Presentation (Details) customer in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) transmission_center company MW | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) transmission_center customer company mi MW | Jun. 30, 2019 USD ($)
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 | $ 12,000,000 | $ 9,000,000 | $ 23,000,000 | $ 22,000,000
Capitalized interest | 6,000,000 | $ 7,000,000 | 13,000,000 | $ 12,000,000
Incremental increase to uncollectible expense due to Covid-19 | 43,000,000 |  |  |
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 |
Ohio Companies and JCP&L | Future Recovery of Incremental Costs |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Incremental increase to uncollectible expense due to Covid-19 | $ 27,000,000 |  |  |
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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