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Commitments, Guarantees and Contingencies - Narrative (Details) T in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) phase T | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 08, 2021 director | Mar. 07, 2021 director | Feb. 20, 2018 USD ($)
Guarantor Obligations [Line Items] |  |  |  |  |  |
Outstanding guarantees and other assurances aggregated | $ 1,700,000,000 |  |  |  |  |
Company posted collateral related to net liability positions | $ 26,000,000 |  |  |  |  |
Collateral posted due to credit rating downgrade |  | $ 25,000,000 |  |  |  |
Goal to reduce in GHG emissions | 30.00% |  |  |  |  |
Amount of code of conduct payment |  |  | $ 4,000,000 |  |  |
Number of Board Members | director |  |  |  | 12 | 11 |
Regulation of Waste Disposal |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Accrual for environmental loss contingencies | $ 102,000,000 |  |  |  |  |
Environmental liabilities former gas facilities | $ 67,000,000 |  |  |  |  |
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 |  |  |  |  |
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 | 33.33333% |  |  |  |  |
FE |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Outstanding guarantees and other assurances aggregated | $ 1,100,000,000 |  |  |  |  |
Other Guarantee |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Outstanding guarantees and other assurances aggregated | 108,000,000 |  |  |  |  |
Other Assurances |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Outstanding guarantees and other assurances aggregated | 474,000,000 |  |  |  |  |
Term Loan Facility due November 2024 | Line of Credit | Global Holding |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Face amount of debt | $ 120,000,000 |  |  |  |  |
EPA | Clean Water Act |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Proposed penalty amount |  |  |  |  |  | $ 610,000

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