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v3.25.1

Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Schedule of Equity Method Investments [Line Items] |  |  |
Goodwill | $ 2,871 | $ 2,845 | $ 3,048
UGI International |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Percentage of fair value exceeding carrying value | 30.00% |  |
AmeriGas Propane |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Impairment of goodwill | $ 195 |  |
Goodwill |  | 1,100 |
UGI International |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Goodwill |  | $ 922 |

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