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Fair Value Measurements - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Impairment of goodwill |  |  | $ 656,000,000 | $ 0 | $ 0
AmeriGas Propane |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Impairment of goodwill | $ 656,000,000 | $ 656,000,000 | 656,000,000 |  |
Level 3 | Commodity contracts | Minimum |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Unobservable inputs reconciliation | 7,000,000 |  | 7,000,000 |  |
Level 3 | Commodity contracts | Maximum |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Unobservable inputs reconciliation | $ 27,000,000 |  | $ 27,000,000 |  |

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