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Derivative Instruments and Hedging Activities - Narrative (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2023 EUR (€) | Sep. 30, 2022 EUR (€) | Dec. 07, 2021 EUR (€)
Derivative [Line Items] |  |  |  |  |  |
Pre-tax net losses associated with interest rate hedges | $ 46,000,000 |  |  |  |  |
Pre-tax (losses) gains associated with net investment hedges | (57,000,000) | $ 123,000,000 | $ 9,000,000 |  |  |
Maximum amount of loss | 298,000,000 |  |  |  |  |
Cash collateral received | 40,000,000 | 398,000,000 |  |  |  |
3.25% Senior Notes Due November 2025 | UGI Utilities Senior Notes: | UGI International LLC |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Interest rate |  |  |  |  |  | 3.25%
IRPA |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 0 | 0 |  |  |  |
Foreign Exchange Forward |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Potential exposure coverage, percent (as a percentage) | 90.00% |  |  | 90.00% |  |
Foreign currency contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 425,000,000 | $ 465,000,000 |  | € 256,000,000 | € 411,000,000 |
Foreign currency contracts | UGI International LLC | Net Investment Hedging |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | € |  |  |  |  |  | € 93,000,000

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