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Derivative Instruments and Hedging Activities - Narrative (Details) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2022 EUR (€) | Dec. 07, 2021 EUR (€) | Sep. 30, 2021 USD ($) | Sep. 30, 2021 EUR (€) | Mar. 31, 2021 EUR (€)
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax (losses) gains associated with net investment hedges | $ 21,000,000 | $ 31,000,000 | $ 34,000,000 | $ (1,000,000) |  |  |  |  |
Maximum amount of loss | 2,035,000,000 |  | 2,035,000,000 |  |  |  |  |  |
Cash collateral received | (603,000,000) | (37,000,000) | (603,000,000) | (37,000,000) |  |  | $ (468,000,000) |  |
UGI International | Senior Notes | 3.25% Senior notes due November 2025 |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 3.25% |  |  |
IRPAs |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | 0 | 0 | 0 | 0 |  |  | 0 |  |
Pre-tax net losses associated with interest rate hedges | $ 3,000,000 |  | $ 3,000,000 |  |  |  |  |  |
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 | $ 274,000,000 | $ 384,000,000 | $ 274,000,000 | $ 384,000,000 | € 486,000,000 |  | $ 509,000,000 | € 173,000,000 | € 173,000,000
Foreign currency contracts | UGI International | Net Investment Hedging |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount | € |  |  |  |  |  | € 93,000,000 |  |  |

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