Equity Method Investments - Schedule of Equity Method Investments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 329	$ 299	$ 175
Midstream & Marketing
Schedule of Equity Method Investments [Line Items]
Carrying Value	294	264	145
Midstream & Marketing | Aurum Renewables
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 46	$ 45	0
Ownership Interest	40.00%	40.00%
Midstream & Marketing | Pine Run
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 80	$ 77	$ 71
Ownership Interest	49.00%	49.00%	49.00%
Midstream & Marketing | MBL Bioenergy
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 147	$ 122	$ 56
Ownership Interest	99.99%	99.99%	99.99%
Midstream & Marketing | Other
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 21	$ 20	$ 18
UGI International
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 35	$ 35	$ 30