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		6 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2023	Apr. 30, 2022
Derivative Instruments, Gain (Loss)
Total amounts of income/(expense) line items in the statement of financial performance in which the effects of fair value hedges are recorded	$ (160)	$ (39)	$ (341)	$ (71)
Gain/(loss) recognized in earnings on derivative instruments	7	(31)	21	(42)
Gain/(loss) recognized in earnings on hedged item	$ (7)	$ 31	$ (21)	$ 42