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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets: | $ 140 | $ 298
Liabilities: | (183) | (276)
Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Non-qualified supplemental postretirement grantor trust investments | 43 | 39
Level 1 | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Non-qualified supplemental postretirement grantor trust investments | 43 | 39
Level 2 | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Non-qualified supplemental postretirement grantor trust investments | 0 | 0
Level 3 | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Non-qualified supplemental postretirement grantor trust investments | 0 | 0
Commodity contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets: | 4 | 6
Liabilities: | (1) | (8)
Commodity contracts | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets: | 133 | 232
Liabilities: | (152) | (274)
Commodity contracts | Level 1 | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets: | 106 | 117
Liabilities: | (120) | (193)
Commodity contracts | Level 2 | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets: | 27 | 115
Liabilities: | (32) | (81)
Commodity contracts | Level 3 | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets: | 0 | 0
Liabilities: | 0 | 0
Foreign currency contracts | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets: | 6 | 38
Liabilities: | (9) | (2)
Foreign currency contracts | Level 1 | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets: | 0 | 0
Liabilities: | 0 | 0
Foreign currency contracts | Level 2 | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets: | 6 | 38
Liabilities: | (9) | (2)
Foreign currency contracts | Level 3 | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets: | 0 | 0
Liabilities: | 0 | 0
Interest rate contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities: | (22) |
Interest rate contracts | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets: | 1 | 28
Interest rate contracts | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities: | 0 |
Interest rate contracts | Level 1 | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets: | 0 | 0
Interest rate contracts | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities: | (22) |
Interest rate contracts | Level 2 | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets: | 1 | 28
Interest rate contracts | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities: | 0 |
Interest rate contracts | Level 3 | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets: | $ 0 | $ 0

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