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