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Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Goodwill [Line Items]
Impairment of goodwill	$ 0	$ 195	$ 656
Accumulated goodwill impairment	851	$ 851
AmeriGas Propane
Goodwill [Line Items]
Impairment of goodwill	$ 1,100
Fair value in excess of carrying value	25.00%

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