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Equity Method Investments - Narrative (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2023 standardCubicFeet MW | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($)
Corporate Joint Venture |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Pre-tax impairment charge |  | $ 26 |
Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Pre-tax impairment charge |  | $ 31 | $ 55
Aurum Renewables |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Landfill gas units | MW | 11 |  |
Effective ownership interest in AmeriGas OLP (as a percentage) | 40.00% |  |
Expected production capacity per day | standardCubicFeet | 9,600 |  |

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