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Supplementary Financial Information - Disaggregation of revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2023	Apr. 30, 2022
Disaggregation of Revenue [Line Items]
Total net revenue	$ 12,913	$ 16,490	$ 26,741	$ 33,518
Americas
Disaggregation of Revenue [Line Items]
Total net revenue	5,452	6,903	11,225	13,762
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total net revenue	4,388	6,022	9,028	11,958
Asia-Pacific and Japan
Disaggregation of Revenue [Line Items]
Total net revenue	$ 3,073	$ 3,565	$ 6,488	$ 7,798

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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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