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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 | Mar. 31, 2023 | Sep. 30, 2022 | Mar. 31, 2022
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: | $ 422 | $ 2,418 | $ 2,035
Liabilities: | (457) | (515) | (324)
Commodity contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: | 19 | 31 | 38
Liabilities: | (36) | (26) | (17)
Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Non-qualified supplemental postretirement grantor trust investments | 31 | 43 | 50
Recurring | Commodity contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: | 374 | 2,233 | 1,969
Liabilities: | (432) | (513) | (321)
Recurring | Foreign currency contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: | 23 | 119 | 35
Liabilities: | (4) | (2) | (2)
Recurring | Interest rate contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: | 25 | 66 | 31
Liabilities: | (21) |  | (1)
Recurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Non-qualified supplemental postretirement grantor trust investments | 31 | 43 | 50
Recurring | Level 1 | Commodity contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: | 229 | 938 | 823
Liabilities: | (294) | (377) | (308)
Recurring | Level 1 | Foreign currency contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: | 0 | 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: | 145 | 1,268 | 1,146
Liabilities: | (138) | (136) | (13)
Recurring | Level 2 | Foreign currency contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: | 23 | 119 | 35
Liabilities: | (4) | (2) | (2)
Recurring | Level 2 | Interest rate contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets: | 25 | 66 | 31
Liabilities: | (21) |  | (1)
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 | 27 | 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 | 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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