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Commitments, Guarantees and Contingencies - Narrative (Details) T in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 USD ($) phase T | Dec. 31, 2018 USD ($)
Guarantor Obligations [Line Items] |  |
Outstanding guarantees and other assurances aggregated | $ 1,600,000,000 |
Proposed goal to reduce CO2 pollution (percent) | 90.00% |
Nuclear plant decommissioning trusts | $ 871,000,000 | $ 790,000,000
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 | $ 119,000,000 |
Environmental liabilities former gas facilities | $ 83,000,000 |
National Ambient Air Quality Standards |  |
Guarantor Obligations [Line Items] |  |
Capping of SO2 Emissions Under CSAPR | T | 2.4 |
Capping of NOx emissions under CSAPR | T | 1.2 |
National Ambient Air Quality Standards | CSAPR |  |
Guarantor Obligations [Line Items] |  |
Number of phases under the EPA’s CAIR for reductions of Sulfur Dioxide and Mono-Nitrogen Oxides | phase | 2 |
Regulated Distribution |  |
Guarantor Obligations [Line Items] |  |
Company posted collateral related to net liability positions | $ 2,000,000 |
Global Holding | Senior Secured Term Loan | Senior Loans | Signal Peak, Global Rail and Affiliates |  |
Guarantor Obligations [Line Items] |  |
Investment ownership percentage | 69.99% |
FEV | Senior Secured Term Loan | Senior Loans | Signal Peak | Global Holding |  |
Guarantor Obligations [Line Items] |  |
Investment ownership percentage | 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% |
AE Supply |  |
Guarantor Obligations [Line Items] |  |
Company posted collateral related to net liability positions | $ 0 |
JCP&L, ME and PN | Nuclear Plant Matters | Financial Guarantee |  |
Guarantor Obligations [Line Items] |  |
Nuclear plant decommissioning trusts | 900,000,000 |
FES and FENOC |  |
Guarantor Obligations [Line Items] |  |
Outstanding guarantees and other assurances aggregated | 343,000,000 |
FE |  |
Guarantor Obligations [Line Items] |  |
Outstanding guarantees and other assurances aggregated | 1,000,000,000 |
Other Guarantee |  |
Guarantor Obligations [Line Items] |  |
Outstanding guarantees and other assurances aggregated | 145,000,000 |
Other Guarantees and Assurances |  |
Guarantor Obligations [Line Items] |  |
Outstanding guarantees and other assurances aggregated | 301,000,000 |
Term Loan Facility Due March 2020 | Line of Credit | Global Holding |  |
Guarantor Obligations [Line Items] |  |
Face amount of debt | 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 |
Hatfield Ferry | Line of Credit | Surety Bond (Collateralized Amount) |  |
Guarantor Obligations [Line Items] |  |
Maximum amount borrowed under revolving credit facility | $ 31,000,000 |

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