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Income Taxes - Narrative (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 21, 2019 | Dec. 31, 2017 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Mar. 27, 2020 | Sep. 30, 2017
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Foreign tax credits |  |  | $ 0 | $ 10,000,000 | $ 13,000,000 |  |
Net operating loss carryback |  |  |  |  |  | $ 32,000,000 |
Income taxes receivable |  |  | $ 80,000,000 | $ 0 |  |  |
Tax Cuts And Jobs Act Of 2017, incomplete accounting, change in tax rate, deferred tax liability, provisional income tax benefit, including unrecognized deferred tax liability |  |  |  |  | $ 384,000,000 |  |
Effective income tax rate reconciliation, at federal statutory income tax rate, percent (as a percentage) |  |  | 21.00% | 21.00% | 24.50% |  |
Increase (decrease) in income tax liabilities |  |  |  |  | $ (52,000,000) |  |
Tax Cuts And Jobs Act of 2017, transition tax for accumulated foreign earnings, provisional Income tax expense (benefit) |  |  | $ 2,000,000 | $ 4,000,000 |  |  |
Income tax expense (benefit), continuing operations, adjustment of deferred tax (asset) liability |  | $ (12,000,000) |  | 2,000,000 |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  | 34,000,000 | 21,000,000 |  |  |
Increase (decrease) in valuation allowance |  |  | 14,000,000 | (26,000,000) |  |  |
Unrecognized income tax benefits |  |  | 4,000,000 | 11,000,000 | 12,000,000 |  | $ 12,000,000
Unrecognized tax benefits if recognized would impact the reported effective tax rate |  |  | 4,000,000 |  |  |  |
Accrued Interest Included |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Unrecognized income tax benefits |  |  | 4,000,000 |  |  |  |
Future Utilization of Foreign Tax Credits |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  |  | (25,000,000) |  |  |
National Interest Deduction Carryover |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  | 16,000,000 |  |  |  |
Flaga |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  | 2,000,000 |  |  |  |
UGI France |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  | 5,000,000 |  |  |  |
AmeriGas Propane |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Incentive distribution, distribution |  |  |  |  | 13,000,000 |  |
Operating loss carryforwards |  |  | 12,000,000 |  |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  | 2,000,000 |  |  |  |
Other Subsidiaries |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Deferred tax assets relating to operating loss carryforwards |  |  | 25,000,000 |  |  |  |
Merger Sub |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Incentive distribution, distribution | $ 2,228,000,000 |  |  |  |  |  |
Cost for income tax purposes | 2,030,000,000 |  |  |  |  |  |
Deferred tax asset, step up in tax basis of the underlying assets | $ 512,000,000 |  |  | 512,000,000 |  |  |
Foreign | Flaga |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Operating loss carryforwards |  |  | 11,000,000 |  |  |  |
Foreign | UGI France |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Operating loss carryforwards |  |  | 14,000,000 |  |  |  |
State |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Decrease in income tax expense due to state tax flow through of accelerated depreciation |  |  | 11,000,000 | $ 7,000,000 | 4,000,000 |  |
Operating loss carryforwards |  |  | $ 393,000,000 |  |  |  |
French Parliament |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Effective income tax rate reconciliation, at federal statutory income tax rate, percent (as a percentage) |  |  | 34.43% |  |  |  |
French Parliament | Foreign |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |
Increase (decrease) in income tax liabilities |  |  |  |  | $ 1,000,000 |  |

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