Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impairment of goodwill	$ 195	$ 656	$ 0
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	$ 62