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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Income Tax Examination [Line Items] |  |  |
Foreign tax credits | $ 25,000,000 | $ 5,000,000 | $ 0
Foreign tax credit carryforwards | 64,000,000 | 76,000,000 |
Net operating loss carryback |  |  | 15,000,000
Income taxes receivable | 36,000,000 | 128,000,000 |
GILTI taxes | 13,000,000 | 3,000,000 | 8,000,000
Deferred tax assets relating to operating loss carryforwards | 75,000,000 | 48,000,000 |
Increase (decrease) in valuation allowance |  | 3,000,000 |
Unrecognized tax benefits if recognized would impact the reported effective tax rate | 26,000,000 | 5,000,000 | 3,000,000
Notional interest deduction carryover |  |  |
Income Tax Examination [Line Items] |  |  |
Increase (decrease) in valuation allowance | (5,000,000) | 17,000,000 |
State Tax Rate Changes |  |  |
Income Tax Examination [Line Items] |  |  |
Increase (decrease) in valuation allowance | (3,000,000) | 4,000,000 |
Future FTC's realizable |  |  |
Income Tax Examination [Line Items] |  |  |
Increase (decrease) in valuation allowance | (16,000,000) | 6,000,000 |
Foreign Net Operating Loss Carry Forwards |  |  |
Income Tax Examination [Line Items] |  |  |
Increase (decrease) in valuation allowance | 11,000,000 | 4,000,000 |
Capital Losses |  |  |
Income Tax Examination [Line Items] |  |  |
Increase (decrease) in valuation allowance | (22,000,000) |  |
Disallowed Interest |  |  |
Income Tax Examination [Line Items] |  |  |
Increase (decrease) in valuation allowance | 19,000,000 |  |
AmeriGas Propane |  |  |
Income Tax Examination [Line Items] |  |  |
Operating loss carryforwards | 9,000,000 |  |
Other Subsidiaries |  |  |
Income Tax Examination [Line Items] |  |  |
Deferred tax assets relating to operating loss carryforwards | 75,000,000 |  |
Fiscal 2021 |  |  |
Income Tax Examination [Line Items] |  |  |
Income taxes receivable | 37,000,000 | 37,000,000 |
Effects of tax rate changes – State, net of federal benefit |  |  |
Income Tax Examination [Line Items] |  |  |
Benefit from legislation | 4,000,000 | 20,000,000 |
Decrease in income tax expense due to state tax flow through of accelerated depreciation | 11,000,000 | $ 10,000,000 | 9,000,000
Operating loss carryforwards | 1,071,000,000 |  |
Foreign | Flaga |  |  |
Income Tax Examination [Line Items] |  |  |
Operating loss carryforwards | 6,000,000 |  |
Foreign | UGI France |  |  |
Income Tax Examination [Line Items] |  |  |
Operating loss carryforwards | 23,000,000 |  |
Foreign | Italy |  |  |
Income Tax Examination [Line Items] |  |  |
Foreign tax credit carryforwards |  |  | $ 23,000,000
Foreign | Tax and Customs Administration, Netherlands |  |  |
Income Tax Examination [Line Items] |  |  |
Operating loss carryforwards | 44,000,000 |  |
Foreign | Administration of the Treasury, Belgium |  |  |
Income Tax Examination [Line Items] |  |  |
Operating loss carryforwards | 10,000,000 |  |
Foreign | Her Majesty's Revenue and Customs (HMRC) |  |  |
Income Tax Examination [Line Items] |  |  |
Operating loss carryforwards | $ 5,000,000 |  |

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