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Goodwill and Intangible Assets - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2023
Goodwill [Line Items] |  |  |  |
Impairment of goodwill | $ 0 | $ 195,000,000 | $ 656,000,000 |
Amortization expense of intangible assets | 54,000,000 | 55,000,000 | 56,000,000 |
Fiscal 2026 | 47,000,000 |  |  |
Fiscal 2027 | 25,000,000 |  |  |
Fiscal 2028 | 16,000,000 |  |  |
Fiscal 2029 | 14,000,000 |  |  |
Fiscal 2030 | $ 12,000,000 |  |  |
Senior Notes Due 2028 | Senior Notes | AmeriGas Partners and AmeriGas Finance Corp. |  |  |  |
Goodwill [Line Items] |  |  |  |
Principal amount |  |  |  | $ 500,000,000
Interest rate (as a percentage) |  |  |  | 9.375%
AmeriGas Propane |  |  |  |
Goodwill [Line Items] |  |  |  |
Impairment of goodwill |  | $ 195,000,000 | $ 656,000,000 |

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