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Debt - UGI International (Details) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 07, 2021 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 07, 2021 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |
Loss on extinguishments of debt |  | $ 11 | $ 0 | $ 0 |
UGI International LLC | Senior Notes | 2.50% Senior Notes due December 2029 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount | € |  |  |  |  | € 400,000,000
Stated interest rate (as a percentage) |  |  |  |  | 2.50%
UGI International LLC | Senior Notes | 3.25% Senior Notes Due November 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (as a percentage) |  |  |  |  | 3.25%
Loss on extinguishments of debt | $ 11 |  |  |  |

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