Segment Information - Segment Operating Results from Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2022
Segment Reporting Information
Net revenue	$ (30,127)	$ (29,135)	$ (28,496)
Segment earnings (loss) from operations	2,190	2,089	782
Intersegment net revenue
Segment Reporting Information
Net revenue	522	563	417
Operating segments
Segment Reporting Information
Net revenue	(30,649)	(29,698)	(28,913)
Segment earnings (loss) from operations	3,469	3,609	3,329
Server
Segment Reporting Information
Net revenue	(15,931)	(13,926)	(15,137)
Server | Intersegment net revenue
Segment Reporting Information
Net revenue	274	435	335
Server | Operating segments
Segment Reporting Information
Net revenue	(16,205)	(14,361)	(15,472)
Segment earnings (loss) from operations	1,818	1,830	1,958
Hybrid Cloud
Segment Reporting Information
Net revenue	(5,172)	(5,396)	(5,173)
Hybrid Cloud | Intersegment net revenue
Segment Reporting Information
Net revenue	214	97	60
Hybrid Cloud | Operating segments
Segment Reporting Information
Net revenue	(5,386)	(5,493)	(5,233)
Segment earnings (loss) from operations	245	232	468
Intelligent Edge
Segment Reporting Information
Net revenue	(4,501)	(5,362)	(3,849)
Intelligent Edge | Intersegment net revenue
Segment Reporting Information
Net revenue	31	17	8
Intelligent Edge | Operating segments
Segment Reporting Information
Net revenue	(4,532)	(5,379)	(3,857)
Segment earnings (loss) from operations	1,115	1,343	542
Financial Services
Segment Reporting Information
Net revenue	(3,509)	(3,466)	(3,326)
Financial Services | Intersegment net revenue
Segment Reporting Information
Net revenue	3	14	13
Financial Services | Operating segments
Segment Reporting Information
Net revenue	(3,512)	(3,480)	(3,339)
Segment earnings (loss) from operations	316	281	387
Corporate Investments and Other
Segment Reporting Information
Net revenue	(1,014)	(985)	(1,011)
Corporate Investments and Other | Intersegment net revenue
Segment Reporting Information
Net revenue	0	0	1
Corporate Investments and Other | Operating segments
Segment Reporting Information
Net revenue	(1,014)	(985)	(1,012)
Segment earnings (loss) from operations	$ (25)	$ (77)	$ (26)