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Fair Value Measurements - Financial Assets and Liabilities that are Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: | $ 114 | $ 140 | $ 162
Liabilities: | (197) | (183) | (176)
Commodity contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: | 3 | 4 | 4
Liabilities: | (2) | (1) | (5)
Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Non-qualified supplemental postretirement grantor trust investments | 34 | 43 | 42
Recurring | Commodity contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: | 113 | 133 | 137
Liabilities: | (158) | (152) | (174)
Recurring | Foreign currency contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: |  | 6 | 18
Liabilities: | (25) | (9) | (2)
Recurring | Interest rate contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: | 1 | 1 | 7
Liabilities: | (14) | (22) |
Recurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Non-qualified supplemental postretirement grantor trust investments | 34 | 43 | 42
Recurring | Level 1 | Commodity contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: | 100 | 106 | 92
Liabilities: | (103) | (120) | (148)
Recurring | Level 1 | Foreign currency contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: |  | 0 | 0
Liabilities: | 0 | 0 | 0
Recurring | Level 1 | Interest rate contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: | 0 | 0 | 0
Liabilities: | 0 | 0 |
Recurring | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Non-qualified supplemental postretirement grantor trust investments | 0 | 0 | 0
Recurring | Level 2 | Commodity contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: | 13 | 27 | 45
Liabilities: | (55) | (32) | (26)
Recurring | Level 2 | Foreign currency contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: |  | 6 | 18
Liabilities: | (25) | (9) | (2)
Recurring | Level 2 | Interest rate contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: | 1 | 1 | 7
Liabilities: | (14) | (22) |
Recurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Non-qualified supplemental postretirement grantor trust investments | 0 | 0 | 0
Recurring | Level 3 | Commodity contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: | 0 | 0 | 0
Liabilities: | 0 | 0 | 0
Recurring | Level 3 | Foreign currency contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: |  | 0 | 0
Liabilities: | 0 | 0 | 0
Recurring | Level 3 | Interest rate contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: | 0 | 0 | $ 0
Liabilities: | $ 0 | $ 0 |

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