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Segment Information - Revenue by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Segment Reporting Information [Line Items]
Total net revenue	$ 6,700	$ 6,009	$ 13,533	$ 12,958
Total Americas
Segment Reporting Information [Line Items]
Total net revenue	2,479	2,316	5,092	5,102
United States
Segment Reporting Information [Line Items]
Total net revenue	2,018	1,906	4,196	4,224
Americas excluding U.S.
Segment Reporting Information [Line Items]
Total net revenue	461	410	896	878
Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Total net revenue	2,554	2,198	5,174	4,758
Asia Pacific and Japan
Segment Reporting Information [Line Items]
Total net revenue	$ 1,667	$ 1,495	$ 3,267	$ 3,098

X

- Definition

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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