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Income Taxes - Deferred Tax Liabilities (Assets) (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Excess book basis over tax basis of property, plant and equipment | $ 994 | $ 966
Intangible assets and goodwill | 86 | 81
Utility regulatory assets | 74 | 84
Investment in AmeriGas Partners | 31 | 0
Derivative instrument assets | 0 | 19
Other | 50 | 37
Gross deferred tax liabilities | 1,235 | 1,187
Interest expense | (118) | (83)
Operating loss carryforwards | (72) | (75)
Utility regulatory liabilities | (72) | (83)
Foreign tax credit carryforwards | (49) | (64)
Employee-related benefits | (33) | (37)
Investment tax credits | (26) | 0
Utility environmental liabilities | (16) | (15)
Pension plan liabilities | (8) | (14)
Derivative instrument liabilities | (3) | 0
Investment in AmeriGas Partners | 0 | (28)
Other | (58) | (58)
Gross deferred tax assets | (455) | (457)
Deferred tax assets valuation allowance | 130 | 141
Net deferred tax liabilities | $ 910 | $ 871

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