Financial Instruments - Pre-tax Effect of Derivative Instruments on Statement of Earnings (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Net revenue	$ 6,009	$ 7,150	$ 12,958	$ 14,703
Interest and other, net	(68)	(18)	(87)	(69)
Net revenue
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses)	48	46	74	126
Interest and other, net
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses)	273	127	259	(41)
Interest rate contracts \| Net revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivatives in fair value hedging relationships	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	(156)	(60)	(185)	(218)
Foreign currency contracts \| Net revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gains (losses) reclassified from accumulated other comprehensive income into income	48	46	74	126
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	166	22	209	75
Gains (losses) on derivatives not designated as hedging instruments	99	108	45	(123)
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	8	(3)	5	7
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	$ 156	$ 60	$ 185	$ 218

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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Amount of income (expense) related to nonoperating activities, classified as other.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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