Financial Instruments - Pre-tax Effect of Derivative Instruments on Statement of Earnings (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Net revenue	$ 6,897	$ 6,816	$ 20,430	$ 19,774
Interest and other, net	(50)	(71)	(105)	(158)
Net revenue
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses)	(14)	23	(113)	97
Interest and other, net
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses)	16	(263)	(207)	(4)
Interest rate contracts | Net revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivatives in fair value hedging relationships	0	0	0	0
Amount of gains (losses) reclassified from accumulated other comprehensive income into income	0	0	0	0
Interest rate contracts | Interest and other, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivatives in fair value hedging relationships	(3)	(13)	67	(198)
Amount of gains (losses) reclassified from accumulated other comprehensive income into income	0	(1)	(2)	(1)
Foreign currency contracts | Net revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gains (losses) reclassified from accumulated other comprehensive income into income	(14)	23	(113)	97
Gains (losses) on derivatives not designated as hedging instruments	0	0	0	0
Foreign currency contracts | Interest and other, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gains (losses) reclassified from accumulated other comprehensive income into income	50	(264)	(147)	(55)
Gains (losses) on derivatives not designated as hedging instruments	(33)	8	(61)	53
Other derivatives | Net revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivatives not designated as hedging instruments	0	0	0	0
Other derivatives | Interest and other, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivatives not designated as hedging instruments	(1)	(6)	3	(1)
Derivatives designated as hedging instruments | Interest rate contracts | Net revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivatives in fair value hedging relationships	0	0	0	0
Derivatives designated as hedging instruments | Interest rate contracts | Interest and other, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivatives in fair value hedging relationships	$ 3	$ 13	$ (67)	$ 198