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Commitments, Guarantees and Contingencies - Nuclear Insurance, Commitments and Collateral (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) Nuclear_Power_Plant | Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items] |  |
Liability assessed with respect to single nuclear incident | $ 13,400,000,000 |
Plants licensed to operate | Nuclear_Power_Plant | 102 |
Portion of insurance coverage of private insurer included in single nuclear incident | $ 450,000,000 |
Portion of insurance coverage by industry retrospective rating plan | 13,000,000,000 |
Losses in excess of private insurance contributed for each nuclear unit license | 127,000,000 |
Losses in excess of private insurance contributed for each nuclear unit license per unit | 19,000,000 |
Nuclear incidence liability per incident of parent and subsidiary companys based on their present nuclear ownership and leasehold interests | 509,000,000 |
Nuclear incident liability not more than in any one year per incident of parent and subsidiary companies based on their present nuclear ownership and leasehold interests | 76,000,000 |
Aggregate indemnity | $ 1,400,000,000 |
Waiting period | 84 days |
Coverage of decontamination costs | $ 2,750,000,000 |
Insurance coverage for replacement power costs | $ 1,060,000,000 |
Environmental plan, submission period | 30 days |
Outstanding guarantees and other assurances aggregated | $ 3,800,000,000 |
Potential additional collateral obligations | 407,000,000 |
FE |  |
Loss Contingencies [Line Items] |  |
Outstanding guarantees and other assurances aggregated | 1,200,000,000 |
Subsidiaries' Guarantees |  |
Loss Contingencies [Line Items] |  |
Outstanding guarantees and other assurances aggregated | 1,800,000,000 |
Other Guarantees |  |
Loss Contingencies [Line Items] |  |
Outstanding guarantees and other assurances aggregated | 275,000,000 |
Other Assurances |  |
Loss Contingencies [Line Items] |  |
Outstanding guarantees and other assurances aggregated | 459,000,000 |
Regulated Distribution |  |
Loss Contingencies [Line Items] |  |
Company posted collateral related to net liability positions | 4,000,000 |
Potential additional collateral obligations | $ 148,000,000 |
FEV | Signal Peak | Senior Secured Term Loan | Senior Loans | Global Holding |  |
Loss Contingencies [Line Items] |  |
Investment ownership percentage | 33.33% |
FES |  |
Loss Contingencies [Line Items] |  |
Company posted collateral related to net liability positions | $ 123,000,000 |
Potential additional collateral obligations | 20,000,000 |
FES | CES |  |
Loss Contingencies [Line Items] |  |
Potential additional collateral obligations | $ 2,000,000 |
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 | $ 275,000,000 |
AE Supply |  |
Loss Contingencies [Line Items] |  |
Company posted collateral related to net liability positions | 4,000,000 |
Potential additional collateral obligations | 2,000,000 |
Surety Bond | Line of Credit | FES |  |
Loss Contingencies [Line Items] |  |
Maximum amount borrowed under revolving credit facility |  | $ 31,000,000
Surety Bond | Little Bull Run | Line of Credit |  |
Loss Contingencies [Line Items] |  |
Maximum amount borrowed under revolving credit facility | 169,000,000 | $ 169,000,000
Surety Bond | Hatfield Ferry | Line of Credit |  |
Loss Contingencies [Line Items] |  |
Maximum amount borrowed under revolving credit facility | $ 31,000,000 |

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