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Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Tax Examination [Line Items]
Foreign tax credits		$ 47	$ 17	$ 25
Income tax benefit		(18)	(71)	335
Release of valuation allowance associated with previously disallowed interest expense	$ 31
Income taxes receivable	41	41	56
GILTI taxes		15	2	13
Deferred tax assets relating to operating loss carryforwards	73	73	72
Increase (decrease) in valuation allowance		(59)
Unrecognized tax benefits if recognized would impact the reported effective tax rate	24	24	18	26
Notional interest deduction carryover
Income Tax Examination [Line Items]
Increase (decrease) in valuation allowance		18
Disallowed Interest
Income Tax Examination [Line Items]
Increase (decrease) in valuation allowance		31
Foreign Tax Credit
Income Tax Examination [Line Items]
Increase (decrease) in valuation allowance		(45)
AmeriGas Propane
Income Tax Examination [Line Items]
Operating loss carryforwards	1	1
Other Subsidiaries
Income Tax Examination [Line Items]
Deferred tax assets relating to operating loss carryforwards	73	73
Effects of tax rate changes – State, net of federal benefit
Income Tax Examination [Line Items]
Expense (benefit) from legislation		5	12	4
Decrease in income tax expense due to state tax flow through of accelerated depreciation		11	12	$ 11
Operating loss carryforwards	1,269	1,269
Effects of U.S. tax legislation
Income Tax Examination [Line Items]
Income taxes receivable	41	41	56
Effects of U.S. tax legislation | Fiscal 2021
Income Tax Examination [Line Items]
Income taxes receivable	36	36	$ 36
Effects of tax rate changes - International | Administration of the Treasury, Belgium
Income Tax Examination [Line Items]
Operating loss carryforwards	5	5
Effects of tax rate changes - International | Tax and Customs Administration, Netherlands
Income Tax Examination [Line Items]
Operating loss carryforwards	65	65
Effects of tax rate changes - International | Flaga
Income Tax Examination [Line Items]
Operating loss carryforwards	10	10
Effects of tax rate changes - International | UGI France
Income Tax Examination [Line Items]
Operating loss carryforwards	$ 19	$ 19

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