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Derivative Instruments and Hedging Activities - Fair Value of Derivative Assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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Derivative assets: |  |
Total derivative assets – gross | $ 140 | $ 298
Gross amounts offset in the balance sheet | (88) | (124)
Cash collateral received | (14) | (40)
Total derivative assets – net | 38 | 134
Derivative liabilities: |  |
Total derivative liabilities – gross | (183) | (276)
Gross amounts offset in the balance sheet | 88 | 124
Cash collateral pledged | 36 | 53
Total derivative liabilities – net | (59) | (99)
Interest rate contracts |  |
Derivative liabilities: |  |
Total derivative liabilities – gross | (22) |
Commodity contracts |  |
Derivative assets: |  |
Total derivative assets – gross | 4 | 6
Derivative liabilities: |  |
Total derivative liabilities – gross | (1) | (8)
Derivatives designated as hedging instruments: |  |
Derivative assets: |  |
Total derivative assets – gross | 7 | 42
Derivatives designated as hedging instruments: | Foreign currency contracts |  |
Derivative assets: |  |
Total derivative assets – gross | 6 | 14
Derivatives designated as hedging instruments: | Interest rate contracts |  |
Derivative assets: |  |
Total derivative assets – gross | 1 | 28
Derivative liabilities: |  |
Total derivative liabilities – gross | (22) | 0
Derivatives not designated as hedging instruments: |  |
Derivative assets: |  |
Total derivative assets – gross | 129 | 250
Derivative liabilities: |  |
Total derivative liabilities – gross | (160) | (268)
Derivatives not designated as hedging instruments: | Foreign currency contracts |  |
Derivative assets: |  |
Total derivative assets – gross | 0 | 24
Derivative liabilities: |  |
Total derivative liabilities – gross | (9) | (2)
Derivatives not designated as hedging instruments: | Commodity contracts |  |
Derivative assets: |  |
Total derivative assets – gross | 129 | 226
Derivative liabilities: |  |
Total derivative liabilities – gross | $ (151) | $ (266)

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