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Financial Instruments - Pre-tax Effect of Derivative Instruments on Statement of Earnings (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Net revenue	$ 6,700	$ 6,009	$ 13,533	$ 12,958
Interest and other, net	(11)	(68)	(55)	(87)
Net revenue
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses)	(35)	48	(99)	74
Interest and other, net
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses)	31	273	(223)	259
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	52	(156)	70	(185)
Amount of gains (losses) reclassified from accumulated other comprehensive income into income	(1)	0	(2)	0
Foreign currency contracts | Net revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gains (losses) reclassified from accumulated other comprehensive income into income	(35)	48	(99)	74
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	16	166	(197)	209
Gains (losses) on derivatives not designated as hedging instruments	13	99	(28)	45
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	3	8	4	5
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	$ (52)	$ 156	$ (70)	$ 185

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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