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Segment Information - Segment Operating Results from Continuing Operations (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]
Net revenue	$ 7,627	$ 7,204	$ 15,481	$ 13,959
Segment earnings (loss) from operations	(1,109)	425	(676)	950
Intersegment net revenue
Segment Reporting Information [Line Items]
Net revenue	(96)	(124)	(153)	(281)
Operating Segment
Segment Reporting Information [Line Items]
Net revenue	7,723	7,328	15,634	14,240
Segment earnings (loss) from operations	672	745	1,513	1,592
Server
Segment Reporting Information [Line Items]
Net revenue	4,028	3,786	8,299	7,007
Server | Intersegment net revenue
Segment Reporting Information [Line Items]
Net revenue	(30)	(55)	(49)	(161)
Server | Operating Segment
Segment Reporting Information [Line Items]
Net revenue	4,058	3,841	8,348	7,168
Segment earnings (loss) from operations	241	423	589	802
Hybrid Cloud
Segment Reporting Information [Line Items]
Net revenue	1,393	1,218	2,760	2,449
Hybrid Cloud | Intersegment net revenue
Segment Reporting Information [Line Items]
Net revenue	(60)	(64)	(98)	(106)
Hybrid Cloud | Operating Segment
Segment Reporting Information [Line Items]
Net revenue	1,453	1,282	2,858	2,555
Segment earnings (loss) from operations	78	13	177	64
Intelligent Edge
Segment Reporting Information [Line Items]
Net revenue	1,156	1,081	2,303	2,274
Intelligent Edge | Intersegment net revenue
Segment Reporting Information [Line Items]
Net revenue	(6)	(5)	(5)	(13)
Intelligent Edge | Operating Segment
Segment Reporting Information [Line Items]
Net revenue	1,162	1,086	2,308	2,287
Segment earnings (loss) from operations	274	237	588	590
Financial Services
Segment Reporting Information [Line Items]
Net revenue	857	867	1,729	1,739
Financial Services | Intersegment net revenue
Segment Reporting Information [Line Items]
Net revenue	1	0	0	(1)
Financial Services | Operating Segment
Segment Reporting Information [Line Items]
Net revenue	856	867	1,729	1,740
Segment earnings (loss) from operations	89	81	171	155
Corporate Investments and Other
Segment Reporting Information [Line Items]
Net revenue	193	252	390	490
Corporate Investments and Other | Intersegment net revenue
Segment Reporting Information [Line Items]
Net revenue	(1)	0	(1)	0
Corporate Investments and Other | Operating Segment
Segment Reporting Information [Line Items]
Net revenue	194	252	391	490
Segment earnings (loss) from operations	$ (10)	$ (9)	$ (12)	$ (19)

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The net result for the period of deducting operating expenses from operating revenues.

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