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
	Jan. 31, 2025	Jan. 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	$ (141)	$ (142)
Gain/(loss) recognized in earnings on derivative instruments	7	15
Gain/(loss) recognized in earnings on hedged item	$ (7)	$ (15)