Equity Method Investments - Schedule of Equity Method Investments (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 370	$ 299	$ 130
Midstream & Marketing
Schedule of Equity Method Investments [Line Items]
Carrying Value	359	264
UGI International
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 10	35
Aurum Renewables
Schedule of Equity Method Investments [Line Items]
Ownership Interest	40.00%
Aurum Renewables | Midstream & Marketing
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 47	$ 45
Ownership Interest		40.00%
Pine Run | Midstream & Marketing
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 86	$ 77
Ownership Interest	49.00%	49.00%
MBL Bioenergy | Midstream & Marketing
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 206	$ 122
Ownership Interest	99.99%	99.99%
Other | Midstream & Marketing
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 20	$ 20
Other
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 1	$ 0