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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