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Commitments, Guarantees and Contingencies (Details Textuals) |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 06, 2018 USD ($) | May 01, 2017 USD ($) installment | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Guarantor Obligations [Line Items] |  |  |  |
Outstanding guarantees and other assurances aggregated |  |  | $ 1,700,000,000 |
New syndicated senior secured term loan facility |  |  | $ 352,000,000 |
Curing period |  |  | 30 days |
Proposed goal to reduce CO2 pollution (percent) |  |  | 90.00% |
Nuclear plant decommissioning trusts |  |  | $ 806,000,000 | $ 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 |  |  | $ 116,000,000 |
Environmental liabilities former gas facilities |  |  | 78,000,000 |
Nuclear Plant Matters |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Nuclear plant decommissioning trusts |  |  | 800,000,000 |
Regulated Distribution |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Company posted collateral related to net liability positions |  |  | $ 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% |
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% |
FG | Settled Litigation | Caa Compliance |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Settlement amount |  | $ 109,000,000 |  |
Number of installment payments | installment |  | 3 |  |
Settlement payments | $ 72,000,000 |  |  |
AE Supply |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Company posted collateral related to net liability positions |  |  | $ 2,000,000 |
New syndicated senior secured term loan facility |  |  | 2,000,000 |
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 |  |  | 354,000,000 |
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 |  |  | 235,000,000 |
Other Assurances |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Outstanding guarantees and other assurances aggregated |  |  | 128,000,000 |
Term Loan Facility Due March 2020 [Member] | 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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