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Financial Instruments (Offsetting Assets and Liabilities) (Details) - USD ($)
$ in Millions
Apr. 30, 2023
Jul. 31, 2022
General Discussion of Derivative Instruments and Hedging Activities [Abstract]    
Derivative Assets $ 8 $ 25
Derivative Asset, Not Offset, Policy Election Deduction (1) (17)
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election, Total 7 8
Derivative Liability 23 34
Derivative Liability, Not Offset, Policy Election Deduction (1) (17)
Derivative Liability, Fair Value, Amount Offset Against Collateral $ 22 $ 17