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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Income Tax Examination [Line Items] |  |  |  |
Foreign tax credits |  | $ 47 | $ 17 | $ 25
Income tax benefit |  | (18) | (71) | 335
Release of valuation allowance associated with previously disallowed interest expense | $ 31 |  |  |
Income taxes receivable | 41 | 41 | 56 |
GILTI taxes |  | 15 | 2 | 13
Deferred tax assets relating to operating loss carryforwards | 73 | 73 | 72 |
Increase (decrease) in valuation allowance |  | (59) |  |
Unrecognized tax benefits if recognized would impact the reported effective tax rate | 24 | 24 | 18 | 26
Notional interest deduction carryover |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Increase (decrease) in valuation allowance |  | 18 |  |
Disallowed Interest |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Increase (decrease) in valuation allowance |  | 31 |  |
Foreign Tax Credit |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Increase (decrease) in valuation allowance |  | (45) |  |
AmeriGas Propane |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Operating loss carryforwards | 1 | 1 |  |
Other Subsidiaries |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Deferred tax assets relating to operating loss carryforwards | 73 | 73 |  |
Effects of tax rate changes – State, net of federal benefit |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Expense (benefit) from legislation |  | 5 | 12 | 4
Decrease in income tax expense due to state tax flow through of accelerated depreciation |  | 11 | 12 | $ 11
Operating loss carryforwards | 1,269 | 1,269 |  |
Effects of U.S. tax legislation |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Income taxes receivable | 41 | 41 | 56 |
Effects of U.S. tax legislation | Fiscal 2021 |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Income taxes receivable | 36 | 36 | $ 36 |
Effects of tax rate changes - International | Administration of the Treasury, Belgium |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Operating loss carryforwards | 5 | 5 |  |
Effects of tax rate changes - International | Tax and Customs Administration, Netherlands |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Operating loss carryforwards | 65 | 65 |  |
Effects of tax rate changes - International | Flaga |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Operating loss carryforwards | 10 | 10 |  |
Effects of tax rate changes - International | UGI France |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Operating loss carryforwards | $ 19 | $ 19 |  |

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