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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Impairment of goodwill | $ 0 | $ 195 | $ 656
AmeriGas Propane |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Impairment of goodwill |  | 195 | $ 656
Held-for-Sale, Not Discontinued Operations | UGID |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Pre-tax impairment charges | $ 3 | $ 62 |

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