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, 2022	Jan. 31, 2021
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	$ (32)	$ (25)
Gain/(loss) recognized in earnings on derivative instruments	(11)	(3)
Gain/(loss) recognized in earnings on hedged item	$ 11	$ 3