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Financial Instruments - Schedule of Pre-Tax Effect of Derivative Instruments and Related Hedged Items in a Fair Value Hedging Relationship (Details) - Interest rate contracts - Interest and other, net - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 31, 2025
Jul. 31, 2024
Jul. 31, 2025
Jul. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]        
Total amounts of income/(expense) line items in the statement of financial performance in which the effects of fair value hedges are recorded $ (92) $ (113) $ (381) $ (410)
Gain/(loss) recognized in earnings on derivative instruments 2 13 17 28
Gain/(loss) recognized in earnings on hedged item $ (2) $ (13) $ (17) $ (28)