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, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 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	$ (16)	$ (70)	$ (357)	$ (141)
Gain/(loss) recognized in earnings on derivative instruments	(6)	8	15	(34)
Gain/(loss) recognized in earnings on hedged item	$ 6	$ (8)	$ (15)	$ 34