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Income Taxes (Tables)

12 Months Ended

Sep. 30, 2025

Income Tax Disclosure [Abstract]

Schedule of Income (Loss) Before Income Taxes

Income (loss) before income taxes comprises the following:

			2025						2024						2023
Domestic			$	580					$	305					$	(346)
Foreign			116						35						(1,491)
Total income (loss) before income taxes			$	696					$	340					$	(1,837)

Schedule of Provisions for Income Taxes

The provisions for income taxes consist of the following:

			2025						2024						2023
Current expense (benefit):
Federal			$	—					$	(25)					$	(1)
State			14						12						37
Foreign			50						32						49
Total current expense (benefit)			64						19						85
Deferred expense (benefit):
Federal			(41)						82						34
State			8						34						(21)
Foreign			(13)						(64)						(433)
Total deferred expense (benefit)			(46)						52						(420)
Total income tax expense (benefit)			$	18					$	71					$	(335)

Schedule of Reconciliation of U.S. Federal Statutory Tax Rate to Effective Tax Rate

A reconciliation from the U.S. federal statutory tax rate to our effective tax rate is as follows:

			2025						2024						2023
U.S. federal statutory tax rate			21.0		%				21.0		%				21.0		%
Difference in tax rate due to:
Goodwill impairment not deductible for tax			—						11.6						(7.3)
State income taxes, net of federal benefit			4.6						6.8						(1.7)
Investment tax credits			(12.7)						(6.8)						0.5
Valuation allowance adjustments			(8.8)						(6.3)						1.1
Regulated entity depreciation normalization			(2.0)						(4.5)						0.7
Notional interest deduction			(1.7)						(3.8)						0.7
Nontaxable sale of equity investment			1.5						—						—
Effects of tax rate changes – State, net of federal benefit			(0.7)						3.6						0.2
State NOL adjustment upon disposition			—						2.4						—
Uncertain tax positions			0.8						(2.4)						(0.7)
Impairment of equity investment			—						2.2						—
Federal refund interest accrual			(0.5)						(1.1)						—
Effects of foreign operations			(0.6)						0.1						3.1
Other, net			1.7						(1.9)						0.6
Effective tax rate			2.6		%				20.9		%				18.2		%

Schedule of Deferred Tax Liabilities (Assets)

Deferred tax liabilities (assets) comprise the following at September 30:

			2025						2024
Excess book basis over tax basis of property, plant and equipment			$	1,051					$	994
Intangible assets and goodwill			105						86
Utility regulatory assets			80						74
Investment in AmeriGas Partners			71						31
Other			113						50
Gross deferred tax liabilities			1,420						1,235
Interest expense			(150)						(118)
Operating loss carryforwards			(73)						(72)
Utility regulatory liabilities			(66)						(72)
Foreign tax credit carryforwards			(12)						(49)
Employee-related benefits			(25)						(33)
Investment tax credits			(116)						(26)
Utility environmental liabilities			(19)						(16)
Pension plan liabilities			—						(8)
Derivative instrument liabilities			(19)						(3)
Other			(121)						(58)
Gross deferred tax assets			(601)						(455)
Deferred tax assets valuation allowance			71						130
Net deferred tax liabilities			$	890					$	910

Schedule of Reconciliation of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amounts of unrecognized tax benefits is as follows:

			2025						2024						2023
Unrecognized tax benefits — beginning of year			$	18					$	26					$	5
Additions for tax positions of the current year			7						4						3
Decreases for tax positions taken in prior years			(2)						(11)						—
Increases for tax positions taken in prior years			1						—						19
Settlements with tax authorities/statute lapses			—						(1)						(1)
Unrecognized tax benefits — end of year			$	24					$	18					$	26

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of income before income tax between domestic and foreign jurisdictions.

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Tabular disclosure of the change in unrecognized tax benefits.

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