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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2024 | May 31, 2021 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Sep. 30, 2023
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Impairment of goodwill |  |  | $ 0 | $ 656 | $ 0 | $ 656 |
Goodwill |  |  | 3,030 | $ 3,060 | 3,030 | $ 3,060 | $ 3,027
UGI International |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Goodwill |  |  | 913 |  | 913 |  |
Percentage of fair value exceeding carrying value |  |  |  |  |  |  | 10.00%
AmeriGas Propane |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Impairment of goodwill |  |  |  |  |  |  | $ 656
Goodwill |  |  | $ 1,400 |  | $ 1,400 |  |
Preferred stock, without par value | Equity Units |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Units and shares sold (in shares) |  | 2,200,000 |  |  |  |  |
Notional value |  | $ 220 |  |  |  |  |
Stated value (in USD per share) |  | $ 100 |  |  |  |  |
Undivided beneficial ownership interest |  | 10.00% |  |  |  |  |
Liquidation preference (in USD per share) |  | $ 1,000 |  |  |  |  |
Common Stock, without par value | Equity Units |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity unit received by each holder (in shares) | 2.2973 |  |  |  |  |  |
Converted equity units (in shares) | 5,054,030 |  |  |  |  |  |

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