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Commitments, Guarantees and Contingencies (Details Textuals) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Guarantor Obligations [Line Items] |  |  |  |
Outstanding guarantees and other assurances aggregated | $ 1,700,000,000 | $ 1,700,000,000 |  |
New syndicated senior secured term loan facility | 362,000,000 | $ 362,000,000 |  |
Curing period |  | 30 days |  |
Proposed goal to reduce CO2 pollution (percent) |  | 90.00% |  |
Nuclear plant decommissioning trusts | 822,000,000 | $ 822,000,000 |  | $ 822,000,000
Clean Water Act |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Waste water discharge permit renewal cycle |  | 5 years |  |
Regulation of Waste Disposal |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Accrual for environmental loss contingencies | 115,000,000 | $ 115,000,000 |  |
Environmental liabilities former gas facilities | 78,000,000 | 78,000,000 |  |
Regulated Distribution |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Company posted collateral related to net liability positions | $ 10,000,000 | $ 10,000,000 |  |
Global Holding | Senior Secured Term Loan | Senior Loans | Signal Peak, Global Rail and Affiliates |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Investment ownership percentage | 69.99% | 69.99% |  |
FEV | Senior Secured Term Loan | Senior Loans | Signal Peak | Global Holding |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Investment ownership percentage | 33.33% | 33.33% |  |
WMB Marketing Ventures, LLC | Senior Secured Term Loan | Senior Loans | Signal Peak | Global Holding |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Investment ownership percentage | 33.33% | 33.33% |  |
AE Supply |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Company posted collateral related to net liability positions | $ 1,000,000 | $ 1,000,000 |  |
New syndicated senior secured term loan facility | 2,000,000 | 2,000,000 |  |
JCP&L, ME and PN | Nuclear Plant Matters | Financial Guarantee |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Nuclear plant decommissioning trusts | 800,000,000 | 800,000,000 |  |
Minimum | Clean Water Act |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Capital investment required to install technology to meet TDS and Sulfate limits |  | 150,000,000 |  |
Maximum | Clean Water Act |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Capital investment required to install technology to meet TDS and Sulfate limits |  | 300,000,000 |  |
FES and FENOC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Outstanding guarantees and other assurances aggregated | 352,000,000 | 352,000,000 |  |
FE |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Outstanding guarantees and other assurances aggregated | 1,000,000,000 | 1,000,000,000 |  |
Other Guarantee |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Outstanding guarantees and other assurances aggregated | 220,000,000 | 220,000,000 |  |
Other Assurances |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Outstanding guarantees and other assurances aggregated | 141,000,000 | 141,000,000 |  |
Term Loan Facility Due March 2020 | Line of Credit | Global Holding |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Face amount of debt | 300,000,000 | 300,000,000 | $ 300,000,000 |
Little Bull Run | Line of Credit | Surety Bond (Collateralized Amount) |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum amount borrowed under revolving credit facility | 169,000,000 | 169,000,000 |  |
Hatfield Ferry | Line of Credit | Surety Bond (Collateralized Amount) |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum amount borrowed under revolving credit facility | 31,000,000 | $ 31,000,000 |  |
McElroy's Run Impoundment Site | Pleasants Power Station |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Increase in asset retirement obligation | 43,000,000 |  |  |
McElroy's Run Impoundment Site | Pleasants Power Station | AE Supply | Regulation of Waste Disposal |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Increase in asset retirement obligation | $ 43,000,000 |  |  |

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