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Commitments, Guarantees and Contingencies - Narrative (Details) T in Millions |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 21, 2021 USD ($) | Feb. 20, 2018 USD ($) | Sep. 30, 2021 USD ($) phase T | Dec. 31, 2019 USD ($)
Guarantor Obligations [Line Items] |  |  |  |
Outstanding guarantees and other assurances aggregated |  |  | $ 1,100,000,000 |
Company posted collateral related to net liability positions |  |  | $ 55,000,000 |
Goal to reduce in GHG emissions |  |  | 30.00% |
Amount of code of conduct payment |  |  |  | $ 4,000,000
Regulation of Waste Disposal |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Accrual for environmental loss contingencies |  |  | $ 101,000,000 |
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 |  |  | 33.33% |
FE |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Outstanding guarantees and other assurances aggregated |  |  | $ 586,000,000 |
Other Guarantee |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Outstanding guarantees and other assurances aggregated |  |  | 68,000,000 |
Other Assurances |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Outstanding guarantees and other assurances aggregated |  |  | 469,000,000 |
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] |  |  |  |
Amount awarded to other party |  | $ 610,000 |  |
Term of payments |  | 2 years |  |
U.S. Attorney's Office | United States v. Householder, et al. |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Term of payments | 60 days |  |  |
Term of DPA | 3 years |  |  |
Loss in period | $ 230,000,000 |  |  |
United States Treasury | United States v. Householder, et al. |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Amount awarded to other party | 115,000,000 |  |  |
Ohio Development Service | United States v. Householder, et al. |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Amount awarded to other party | $ 115,000,000 |  |  |

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