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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Goodwill	$ 3,070	$ 3,027	$ 3,697
UGI International
Schedule of Equity Method Investments [Line Items]
Goodwill	953
Percentage of fair value exceeding carrying value		10.00%
AmeriGas Propane
Schedule of Equity Method Investments [Line Items]
Impairment of goodwill	656
Goodwill	$ 1,300

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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