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Global LPG Business Transformation Initiatives (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Restructuring Cost and Reserve [Line Items] |  |  |
Costs principally comprising consulting, advisory and employee-related costs |  |  | $ 87
Corporate Services Member |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Costs principally comprising consulting, advisory and employee-related costs | $ 10 | $ 9 | $ 14

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