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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impairment of goodwill	$ 0	$ 195	$ 656
AmeriGas Propane
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impairment of goodwill		195	$ 656
Held-for-Sale, Not Discontinued Operations | UGID
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Pre-tax impairment charges	$ 3	$ 62

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