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Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details) - USD ($)	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Goodwill [Line Items]
Goodwill	$ 3,612,000,000	$ 3,770,000,000	$ 3,518,000,000
Accumulated impairment losses	0	0
Provision for goodwill or other intangible asset impairments	$ 0	$ 0	$ 0
AmeriGas Propane
Goodwill [Line Items]
Fair value in excess of carrying value	30.00%
Goodwill	$ 2,000,000,000

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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