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, 2024	Jul. 31, 2023	Jul. 31, 2024	Jul. 31, 2023
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	$ (113)	$ (16)	$ (410)	$ (357)
Gain/(loss) recognized in earnings on derivative instruments	13	(6)	28	15
Gain/(loss) recognized in earnings on hedged item	$ (13)	$ 6	$ (28)	$ (15)