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Segment Information - Revenue by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2025	Apr. 30, 2024
Segment Reporting Information [Line Items]
Total consolidated net revenue	$ 7,627	$ 7,204	$ 15,481	$ 13,959
Total Americas
Segment Reporting Information [Line Items]
Total consolidated net revenue	3,301	3,144	6,693	5,945
United States
Segment Reporting Information [Line Items]
Total consolidated net revenue	2,739	2,584	5,257	4,878
Americas excluding United States
Segment Reporting Information [Line Items]
Total consolidated net revenue	562	560	1,436	1,067
Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Total consolidated net revenue	2,739	2,454	5,419	4,888
Asia Pacific and Japan
Segment Reporting Information [Line Items]
Total consolidated net revenue	$ 1,587	$ 1,606	$ 3,369	$ 3,126

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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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