Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Goodwill	$ 2,871	$ 2,805	$ 3,070
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		$ 883