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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Mar. 31, 2024	Mar. 31, 2023
Schedule of Equity Method Investments [Line Items]
Goodwill	$ 3,027	$ 3,048	$ 3,709
UGI International
Schedule of Equity Method Investments [Line Items]
Goodwill		931
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

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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