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Organization and Basis of Presentation - Narrative (Details) customer in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 12, 2020 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) mi² agreement entity customer transmission_center company MW | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 16, 2019 USD ($) | Apr. 11, 2019 USD ($) | Jan. 01, 2019 USD ($) | Sep. 26, 2018 USD ($) | Mar. 31, 2018 USD ($) | Aug. 31, 2017 MW | Jun. 30, 2013 USD ($)
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  | $ 40,063,000,000 | $ 42,301,000,000 | $ 40,063,000,000 | $ 42,257,000,000 |  |  |  |  |  |  |
Number of regional transmission centers | transmission_center |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Amount paid to settle claims |  |  |  |  |  |  |  |  |  |  | $ 225,000,000 |  |  |
Regulatory assets that do not earn a current return |  |  |  | 503,000,000 | $ 545,000,000 | 503,000,000 |  |  |  |  |  |  |  |
Regulatory assets currently being recovered through deferred returns |  |  |  | 290,000,000 | 228,000,000 | $ 290,000,000 |  |  |  |  |  |  |  |
Regulatory assets based on prior precedent or anticipated recovery based on rate making premises with specific order |  |  |  |  | $ 111,000,000 |  |  |  |  |  |  |  |  |
Annual Composite Depreciation Rate |  |  |  |  | 2.70% | 2.60% | 2.40% |  |  |  |  |  |  |
Capitalized financing costs |  |  |  |  | $ 45,000,000 | $ 46,000,000 | $ 35,000,000 |  |  |  |  |  |  |
Interest costs capitalized |  |  |  |  | 26,000,000 | 19,000,000 | 17,000,000 |  |  |  |  |  |  |
Property, plant and equipment |  |  |  | 29,911,000,000 | 31,650,000,000 | 29,911,000,000 |  |  |  |  |  |  |  |
Impairments of long-lived assets |  |  |  |  | 0 | 0 | 2,399,000,000 |  |  |  |  |  |  |
Impact of adopting new accounting pronouncements |  |  |  | 35,000,000 |  | 35,000,000 | (6,000,000) |  |  |  |  |  |  |
Net cash used for financing activities |  |  |  |  | 656,000,000 | 1,394,000,000 | (702,000,000) |  |  |  |  |  |  |
Purchased power |  |  |  |  | $ 2,927,000,000 | 3,109,000,000 | 2,926,000,000 |  |  |  |  |  |  |
Number of contracts that may contain variable interest | entity |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Regulated Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of existing utility operating companies | company |  |  |  |  | 10 |  |  |  |  |  |  |  |  |
Number of customers served by utility operating companies | customer |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |
Service Area | mi² |  |  |  |  | 65,000 |  |  |  |  |  |  |  |  |
Plant generation capacity (in MW's) | MW |  |  |  |  | 3,790 |  |  |  |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  | $ 2,000,000,000 |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  | 20,016,000,000 | $ 20,939,000,000 | 20,016,000,000 |  |  |  |  |  |  |  |
Regulated Transmission |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service Area | mi² |  |  |  |  | 24,500 |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  | 9,376,000,000 | $ 10,166,000,000 | 9,376,000,000 |  |  |  |  |  |  |  |
Bath County, Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant generation capacity (in MW's) | MW |  |  |  |  | 3,003 |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Bath County, Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportionate ownership share |  |  |  |  | 60.00% |  |  |  |  |  |  |  |  |
AGC | Bath County, Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant generation capacity (in MW's) | MW |  |  |  |  | 487 |  |  |  |  |  |  |  |  |
Proportionate ownership share |  |  |  |  | 16.25% |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  | $ 161,000,000 |  |  |  |  |  |  |  |  |
Global Holding |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  | $ 28,000,000 |  |  |  |  |  |  |  |  |
Purchase Agreement with Subsidiary of LS Power |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant generation capacity (in MW's) | MW |  |  |  |  |  |  |  |  |  |  |  |  | 1,615 |
Purchase Agreement with Subsidiary of LS Power | Pleasants Power Station | AE Supply |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant generation capacity (in MW's) | MW |  |  |  |  | 1,300 |  |  |  |  |  |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  | $ 186,000,000 |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  | $ 186,000,000 |  |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impact of adopting new accounting pronouncements |  |  |  | 35,000,000 |  | 35,000,000 | (6,000,000) |  |  |  |  |  |  |
Line of Credit | Term Loan Facility Due March 2020 | Global Holding |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  | $ 120,000,000 |  |  |  |  |  |  |  |  |
Line of Credit | Secured Credit Facility | FES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount borrowed under revolving credit facility |  |  |  |  |  |  |  |  |  |  | 500,000,000 |  |  |
Line of Credit | Credit Agreement | FES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount borrowed under revolving credit facility |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |
Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in subsidiaries |  |  |  |  | 0 |  |  |  |  |  |  | $ 0 |  |
Amount of damages awarded to other party |  |  |  |  |  | 66,000,000 |  |  |  |  |  |  |  |
Income taxes paid |  |  |  |  | 14,000,000 |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, before tax |  |  |  |  | (4,000,000) | (48,000,000) | $ (2,255,000,000) |  |  |  |  |  |  |
Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of damages awarded to other party | $ 83,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Phase In Recovery Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt and other long-term obligations |  |  |  | 292,000,000 | 268,000,000 | 292,000,000 |  |  |  |  |  |  |  |
Phase In Recovery Bonds | Ohio Funding Companies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 445,000,000
Senior Secured Term Loan | Senior Loans | Global Holding |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt and other long-term obligations |  |  |  |  | 114,000,000 |  |  |  |  |  |  |  |  |
Intercompany Income Tax Allocation Agreement | Loans Payable | FES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of loan |  |  |  |  |  |  |  |  |  |  | 628,000,000 |  |  |
Obligations settled in cash |  |  |  |  |  |  |  | $ 628,000,000 |  |  |  |  |  |
Affiliated companies | Benefit Obligations | Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations settled in cash |  |  |  |  |  |  |  |  | $ 60,000,000 |  |  |  |  |
Total obligations to be settled |  |  |  |  |  |  |  |  | $ 87,000,000 |  |  |  |  |
Income (loss) from discontinued operations, before tax |  |  | $ 27,000,000 |  |  |  |  |  |  |  |  |  |  |
Affiliated companies | Services Agreements | Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC | FES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts of transaction |  |  |  | $ 112,500,000 | 152,000,000 |  |  |  |  |  |  |  |  |
Affiliated companies | Pension Plan Enhancement | Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts of transaction |  |  |  |  | 14,000,000 |  |  |  |  |  |  |  |  |
2017 | Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Overpayment of NOL's reversed |  |  |  |  |  |  |  |  |  |  | 71,000,000 |  |  |
2018 | Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Overpayment of NOL's reversed |  |  |  |  |  |  |  |  |  |  | $ 88,000,000 |  |  |
Income taxes paid |  | $ 31,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Path-WV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  | $ 18,000,000 |  |  |  |  |  |  |  |  |
Percentage of high-voltage transmission line project owned by subsidiary of FE on the Allegheny Series |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Percentage of high-voltage transmission line project owned by subsidiary of AE on the West Virginia Series |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Power Purchase Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of long term power purchase agreements maintained by parent company with Non utility generation entities | agreement |  |  |  |  | 10 |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |
Power Purchase Agreements | Other FE subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased power |  |  |  |  | $ 116,000,000 | $ 108,000,000 |  |  |  |  |  |  |  |
Continuing Operations | Affiliated companies | Benefit Obligations | Discontinued Operations, Disposed of by Means Other than Sale | FES and FENOC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, before tax |  |  | $ 17,000,000 |  |  |  |  |  |  |  |  |  |  |
Signal Peak [Member] | Global Holding | FEV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  | 33.33% |  |  |  |  |  |  |  |  |

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