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Financial Instruments - Pre-tax Effect of Derivative Instruments on Statement of Earnings (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Net revenue	$ 6,949	$ 7,553
Interest and other, net	(19)	(51)
Net revenue
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses)	26	80
Interest and other, net
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses)	(14)	(168)
Interest rate contracts | Net revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivatives in fair value hedging relationships	0	0
Interest rate contracts | Interest and other, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivatives in fair value hedging relationships	(29)	(158)
Foreign currency contracts | Net revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gains (losses) reclassified from accumulated other comprehensive income into income	26	80
Gains (losses) on derivatives not designated as hedging instruments	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	43	53
Gains (losses) on derivatives not designated as hedging instruments	(54)	(231)
Other derivatives | Net revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivatives not designated as hedging instruments	0	0
Other derivatives | Interest and other, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivatives not designated as hedging instruments	(3)	10
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
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	$ 29	$ 158

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- Definition

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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