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Derivative Instruments and Hedging Activities - Narrative (Details) | 3 Months Ended | 9 Months Ended |  |  |  |
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Jun. 30, 2021 USD ($) agreement | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) agreement | Jun. 30, 2020 USD ($) | Jun. 09, 2021 USD ($) | Jun. 08, 2021 USD ($) | May 03, 2021 USD ($) | Sep. 30, 2020 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |
AOCI, Net Investment Hedge, Gain (Loss), Reclassification, before Tax | $ (8,000,000) | $ (13,000,000) | $ (9,000,000) | $ (22,000,000) |  |  |  |
Term Loan | 2021 UGI Corporation Senior Credit Facility |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 215,000,000 | $ 300,000,000 | $ 300,000,000 |
Forward Starting, Pay-fixed, Receive-variable Interest Rate Swap Agreement |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of receive-variable interest rate swap agreements | agreement | 2 |  | 2 |  |  |  |  |
Forward Starting, Pay-fixed, Receive-variable Interest Rate Swap Agreement | Derivatives designated as hedging instruments: |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | $ 125,000,000 |  | $ 125,000,000 |  |  |  |  |
Variable interest rate | 0.0069 |  | 0.0069 |  |  |  |  |
IRPAs |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  | $ 0
Pre-tax net losses associated with interest rate hedges | $ 4,000,000 |  | $ 4,000,000 |  |  |  |  |
Forward Foreign Currency Exchange Contracts |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount percent of required need coverage | 90.00% |  | 90.00% |  |  |  |  |

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