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Derivative Instruments and Hedging Activities - Narrative (Details) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2023 EUR (€) | Sep. 30, 2022 USD ($) | Sep. 30, 2022 EUR (€) | Mar. 31, 2022 EUR (€) | Dec. 07, 2021 EUR (€)
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax (losses) gains associated with net investment hedges | $ (9,000,000) | $ 21,000,000 | $ (73,000,000) | $ 34,000,000 |  |  |  |  |
Maximum amount of loss | 422,000,000 |  | 422,000,000 |  |  |  |  |  |
Cash collateral received | (55,000,000) | (603,000,000) | (55,000,000) | (603,000,000) |  | $ (398,000,000) |  |  |
UGI International | Senior Notes | 3.25% Senior Notes due November 1, 2025 |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 3.25%
IRPAs |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | 0 | 0 | 0 | 0 |  | 0 |  |  |
Pre-tax net gains associated with interest rate hedges | $ 39,000,000 |  | $ 39,000,000 |  |  |  |  |  |
Forward foreign currency exchange contracts |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative notional amount percent of required need coverage | 90.00% |  | 90.00% |  | 90.00% |  |  |  |
Foreign currency contracts |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | $ 285,000,000 | $ 274,000,000 | $ 285,000,000 | $ 274,000,000 | € 331,000,000 | $ 465,000,000 | € 411,000,000 | € 486,000,000 |
Foreign currency contracts | UGI International | Net Investment Hedges: |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | € |  |  |  |  |  |  |  |  | € 93,000,000

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