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Derivative Instruments and Hedging Activities - Schedule of Derivative Assets, Liabilities and the Effects of Offsetting (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Sep. 30, 2021
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Derivative assets: |  |
Fair value of derivative instruments | $ 2,418 | $ 1,687
Gross amounts offset in the balance sheet | (295) | (216)
Cash collateral received | (398) | (468)
Total derivative assets – net | 1,725 | 1,003
Derivative liabilities: |  |
Total derivative liabilities – gross | (515) | (317)
Gross amounts offset in the balance sheet | 295 | 216
Cash collateral pledged | 7 | 3
Total derivative liabilities – net | (213) | (98)
Foreign currency contracts |  |
Derivative assets: |  |
Fair value of derivative instruments | 119 | 38
Derivative liabilities: |  |
Total derivative liabilities – gross | (2) | (8)
Commodity contract - subject to PGC and DS mechanisms |  |
Derivative assets: |  |
Fair value of derivative instruments | 31 | 58
Derivative liabilities: |  |
Total derivative liabilities – gross | (26) | (23)
Commodity contracts |  |
Derivative assets: |  |
Fair value of derivative instruments | 2,233 | 1,649
Derivative liabilities: |  |
Total derivative liabilities – gross | (513) | (280)
Interest rate contracts |  |
Derivative assets: |  |
Fair value of derivative instruments | 66 |
Derivative liabilities: |  |
Total derivative liabilities – gross |  | (29)
Derivatives designated as hedging instruments |  |
Derivative assets: |  |
Fair value of derivative instruments | 123 | 20
Derivatives designated as hedging instruments | Foreign currency contracts |  |
Derivative assets: |  |
Fair value of derivative instruments | 57 | 20
Derivatives designated as hedging instruments | Interest rate contracts |  |
Derivative assets: |  |
Fair value of derivative instruments | 66 | 0
Derivative liabilities: |  |
Total derivative liabilities – gross | 0 | (29)
Derivatives not designated as hedging instruments |  |
Derivative assets: |  |
Fair value of derivative instruments | 2,264 | 1,609
Derivative liabilities: |  |
Total derivative liabilities – gross | (489) | (265)
Derivatives not designated as hedging instruments | Foreign currency contracts |  |
Derivative assets: |  |
Fair value of derivative instruments | 62 | 18
Derivative liabilities: |  |
Total derivative liabilities – gross | (2) | (8)
Derivatives not designated as hedging instruments | Commodity contracts |  |
Derivative assets: |  |
Fair value of derivative instruments | 2,202 | 1,591
Derivative liabilities: |  |
Total derivative liabilities – gross | $ (487) | $ (257)

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