Segment Information - Revenue by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2025	Jul. 31, 2024
Segment Reporting Information [Line Items]
Total consolidated net revenue	$ 9,136	$ 7,710	$ 24,617	$ 21,669
Total Americas
Segment Reporting Information [Line Items]
Total consolidated net revenue	4,742	3,410	11,435	9,355
United States
Segment Reporting Information [Line Items]
Total consolidated net revenue	4,278	2,882	9,535	7,760
Americas excluding United States
Segment Reporting Information [Line Items]
Total consolidated net revenue	464	528	1,900	1,595
Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Total consolidated net revenue	2,740	2,555	8,159	7,443
Asia Pacific and Japan
Segment Reporting Information [Line Items]
Total consolidated net revenue	$ 1,654	$ 1,745	$ 5,023	$ 4,871

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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+ Details