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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 | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Derivative instruments, Assets | $ 1,156 | $ 1,687 | $ 185
Derivative instruments, Liabilities | (202) | (317) | (147)
Commodity contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Derivative instruments, Assets | 10 | 58 | 1
Derivative instruments, Liabilities | (7) | (23) | (2)
Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Non-qualified supplemental postretirement grantor trust investments | 52 | 53 | 46
Recurring | Commodity contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Derivative instruments, Assets | 1,122 | 1,649 | 171
Derivative instruments, Liabilities | (178) | (280) | (72)
Recurring | Foreign currency contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Derivative instruments, Assets | 29 | 38 | 14
Derivative instruments, Liabilities | (7) | (8) | (25)
Recurring | Interest rate contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Derivative instruments, Assets | 5 |  |
Derivative instruments, Liabilities | (17) | (29) | (50)
Recurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Non-qualified supplemental postretirement grantor trust investments | 52 | 53 | 46
Recurring | Level 1 | Commodity contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Derivative instruments, Assets | 411 | 641 | 60
Derivative instruments, Liabilities | (160) | (264) | (58)
Recurring | Level 1 | Foreign currency contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Derivative instruments, Assets | 0 | 0 | 0
Derivative instruments, Liabilities | 0 | 0 | 0
Recurring | Level 1 | Interest rate contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Derivative instruments, Assets | 0 |  |
Derivative instruments, Liabilities | 0 | 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 |  |  |
Derivative instruments, Assets | 711 | 1,008 | 111
Derivative instruments, Liabilities | (18) | (16) | (14)
Recurring | Level 2 | Foreign currency contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Derivative instruments, Assets | 29 | 38 | 14
Derivative instruments, Liabilities | (7) | (8) | (25)
Recurring | Level 2 | Interest rate contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Derivative instruments, Assets | 5 |  |
Derivative instruments, Liabilities | (17) | (29) | (50)
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 |  |  |
Derivative instruments, Assets | 0 | 0 | 0
Derivative instruments, Liabilities | 0 | 0 | 0
Recurring | Level 3 | Foreign currency contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Derivative instruments, Assets | 0 | 0 | 0
Derivative instruments, Liabilities | 0 | 0 | 0
Recurring | Level 3 | Interest rate contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Derivative instruments, Assets | 0 |  |
Derivative instruments, Liabilities | $ 0 | $ 0 | $ 0

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