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Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets: | $ 97 | $ 140
Liabilities: | (164) | (183)
Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Non-qualified supplemental postretirement grantor trust investments | 35 | 43
Level 1 | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Non-qualified supplemental postretirement grantor trust investments | 35 | 43
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: | 3 | 4
Liabilities: | (8) | (1)
Commodity contracts | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets: | 96 | 133
Liabilities: | (133) | (152)
Commodity contracts | Level 1 | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets: | 85 | 106
Liabilities: | (72) | (120)
Commodity contracts | Level 2 | Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets: | 11 | 27
Liabilities: | (61) | (32)
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: | 1 | 6
Liabilities: | (19) | (9)
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: | 1 | 6
Liabilities: | (19) | (9)
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
Liabilities: | (12) |
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
Liabilities: | 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
Liabilities: | (12) |
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
Liabilities: | $ 0 |

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