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Financial Instruments - Pre-tax Effect of Derivative Instruments on Statement of Earnings (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Derivative Instruments, Gain (Loss)
Net revenue	$ 27,784	$ 26,982	$ 29,135
Interest and other, net	(211)	(215)	(177)
Net revenue
Derivative Instruments, Gain (Loss)
Total gains (losses)	(81)	38	233
Interest and other, net
Derivative Instruments, Gain (Loss)
Total gains (losses)	(137)	22	12
Interest rate contracts | Net revenue
Derivative Instruments, Gain (Loss)
Gains (losses) on derivatives in fair value hedging relationships	0	0	0
Amount of gains (losses) reclassified from accumulated other comprehensive income into income	0	0	0
Interest rate contracts | Net revenue | Derivatives designated as hedging instruments
Derivative Instruments, Gain (Loss)
Gains (losses) on derivatives in fair value hedging relationships	0	0	0
Interest rate contracts | Interest and other, net
Derivative Instruments, Gain (Loss)
Gains (losses) on derivatives in fair value hedging relationships	125	(159)	(414)
Amount of gains (losses) reclassified from accumulated other comprehensive income into income	(2)	(3)	0
Interest rate contracts | Interest and other, net | Derivatives designated as hedging instruments
Derivative Instruments, Gain (Loss)
Gains (losses) on derivatives in fair value hedging relationships	(125)	159	414
Foreign exchange contracts | Net revenue
Derivative Instruments, Gain (Loss)
Amount of gains (losses) reclassified from accumulated other comprehensive income into income	(81)	38	233
Gains (losses) on derivatives not designated as hedging instruments	0	0	0
Foreign exchange contracts | Interest and other, net
Derivative Instruments, Gain (Loss)
Amount of gains (losses) reclassified from accumulated other comprehensive income into income	(73)	(14)	138
Gains (losses) on derivatives not designated as hedging instruments	(68)	44	(134)
Other derivatives | Net revenue
Derivative Instruments, Gain (Loss)
Gains (losses) on derivatives not designated as hedging instruments	0	0	0
Other derivatives | Interest and other, net
Derivative Instruments, Gain (Loss)
Gains (losses) on derivatives not designated as hedging instruments	$ 6	$ (5)	$ 8

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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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