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Derivative Instruments and Hedging Activities - Fair Value of Derivative Assets and Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020
--- | --- | --- | ---
Derivative assets: |  |  |
Total derivative assets — gross | $ 661 | $ 139 | $ 117
Gross amounts offset in the balance sheet | (77) | (57) | (42)
Cash collateral received | (105) | 0 | 0
Total derivative assets — net | 479 | 82 | 75
Derivative liabilities: |  |  |
Total derivative liabilities — gross | (193) | (187) | (238)
Gross amounts offset in the balance sheet | 77 | 57 | 42
Cash collateral pledged | 0 | 7 | 21
Total derivative liabilities — net | (116) | (123) | (175)
Commodity contracts |  |  |
Derivative assets: |  |  |
Total derivative assets — gross | 14 | 7 | 3
Derivative liabilities: |  |  |
Total derivative liabilities — gross | (6) | 0 | (2)
Derivatives designated as hedging instruments: | Foreign currency contracts |  |  |
Derivative assets: |  |  |
Total derivative assets — gross | 15 | 17 | 25
Derivatives designated as hedging instruments: | Interest rate contracts |  |  |
Derivative liabilities: |  |  |
Total derivative liabilities — gross | (35) | (55) | (59)
Derivatives not designated as hedging instruments: |  |  |
Derivative assets: |  |  |
Total derivative assets — gross | 632 | 115 | 89
Derivative liabilities: |  |  |
Total derivative liabilities — gross | (152) | (132) | (177)
Derivatives not designated as hedging instruments: | Foreign currency contracts |  |  |
Derivative assets: |  |  |
Total derivative assets — gross | 9 | 15 | 24
Derivative liabilities: |  |  |
Total derivative liabilities — gross | (13) | (14) | (7)
Derivatives not designated as hedging instruments: | Commodity contracts |  |  |
Derivative assets: |  |  |
Total derivative assets — gross | 623 | 100 | 65
Derivative liabilities: |  |  |
Total derivative liabilities — gross | $ (139) | $ (118) | $ (170)

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