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Commitments, Guarantees and Contingencies - Nuclear Insurance, Commitments and Collateral (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($)
Loss Contingencies [Line Items] |
Coverage of decontamination costs | $ 150,000,000
Liability assessed with respect to single nuclear incident | 560,000,000
Outstanding guarantees and other assurances aggregated | 1,600,000,000
Potential additional collateral obligations | 357,000,000
FE |
Loss Contingencies [Line Items] |
Outstanding guarantees and other assurances aggregated | 350,000,000
Subsidiaries' Guarantees |
Loss Contingencies [Line Items] |
Outstanding guarantees and other assurances aggregated | 1,000,000,000.0
Other Guarantees |
Loss Contingencies [Line Items] |
Outstanding guarantees and other assurances aggregated | 114,000,000
Other Assurances |
Loss Contingencies [Line Items] |
Outstanding guarantees and other assurances aggregated | 151,000,000
Regulated Distribution |
Loss Contingencies [Line Items] |
Potential additional collateral obligations | 99,000,000
JCP& L, ME and PE |
Loss Contingencies [Line Items] |
Annual retrospective premium assessments | $ 1,200,000
FEV | Signal Peak | Senior Secured Term Loan | Senior Loans | Global Holding |
Loss Contingencies [Line Items] |
Investment ownership percentage | 33.33%
WMB Marketing Ventures, LLC | Signal Peak | Senior Secured Term Loan | Senior Loans | Global Holding |
Loss Contingencies [Line Items] |
Investment ownership percentage | 33.33%
Global Holding | Senior Secured Term Loan | Senior Loans |
Loss Contingencies [Line Items] |
Long-term debt and other long-term obligations | $ 114,000,000
Global Holding | Signal Peak, Global Rail and Affiliates | Senior Secured Term Loan | Senior Loans |
Loss Contingencies [Line Items] |
Investment ownership percentage | 69.99%
AE Supply |
Loss Contingencies [Line Items] |
Potential additional collateral obligations | $ 1,000,000
Surety Bond | Little Bull Run | Line of Credit |
Loss Contingencies [Line Items] |
Maximum amount borrowed under revolving credit facility | 169,000,000
Surety Bond | Hatfield Ferry | Line of Credit |
Loss Contingencies [Line Items] |
Maximum amount borrowed under revolving credit facility | 31,000,000
Term Loan Facility Due March 2020 | Line of Credit | Global Holding |
Loss Contingencies [Line Items] |
Face amount of loan | $ 120,000,000

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