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Income Taxes - Schedule of Deferred Tax Liabilities (Assets) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
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Income Tax Disclosure [Abstract] |  |
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 | 0 | (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

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