Financial Instruments - Schedule of Pre-Tax Effect of Derivative Instruments in Cash Flow Hedging Relationships Included in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2025	Apr. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized (losses) gains arising during the period	$ (692)	$ 151	$ (360)	$ (11)
Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized (losses) gains arising during the period	(692)	151	(360)	(11)
Foreign currency contracts | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized (losses) gains arising during the period	(687)	151	(363)	(11)
Interest rate contracts | Cash flow hedges:
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized (losses) gains arising during the period	$ (5)	$ 0	$ 3	$ 0