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Segment Information - Segment Operating Results from Continuing Operations (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]
Net revenue	$ 6,700	$ 6,009	$ 13,533	$ 12,958
Segment earnings (loss) from operations	278	(834)	500	(486)
Intersegment net revenue and other
Segment Reporting Information [Line Items]
Net revenue	(86)	(165)	(181)	(243)
Operating Segment
Segment Reporting Information [Line Items]
Net revenue	6,786	6,174	13,714	13,201
Segment earnings (loss) from operations	735	480	1,560	1,227
Compute
Segment Reporting Information [Line Items]
Net revenue	2,926	2,549	5,856	5,531
Compute | Intersegment net revenue and other
Segment Reporting Information [Line Items]
Net revenue	(50)	(106)	(106)	(154)
Compute | Operating Segment
Segment Reporting Information [Line Items]
Net revenue	2,976	2,655	5,962	5,685
Segment earnings (loss) from operations	335	155	677	479
HPC & MCS
Segment Reporting Information [Line Items]
Net revenue	664	582	1,410	1,413
HPC & MCS | Intersegment net revenue and other
Segment Reporting Information [Line Items]
Net revenue	(21)	(25)	(37)	(33)
HPC & MCS | Operating Segment
Segment Reporting Information [Line Items]
Net revenue	685	607	1,447	1,446
Segment earnings (loss) from operations	19	46	62	109
Storage
Segment Reporting Information [Line Items]
Net revenue	1,128	1,060	2,302	2,297
Storage | Intersegment net revenue and other
Segment Reporting Information [Line Items]
Net revenue	(9)	(26)	(28)	(41)
Storage | Operating Segment
Segment Reporting Information [Line Items]
Net revenue	1,137	1,086	2,330	2,338
Segment earnings (loss) from operations	191	171	426	422
Intelligent Edge
Segment Reporting Information [Line Items]
Net revenue	797	661	1,600	1,376
Intelligent Edge | Intersegment net revenue and other
Segment Reporting Information [Line Items]
Net revenue	(2)	(4)	(5)	(9)
Intelligent Edge | Operating Segment
Segment Reporting Information [Line Items]
Net revenue	799	665	1,605	1,385
Segment earnings (loss) from operations	124	82	276	169
Financial Services
Segment Reporting Information [Line Items]
Net revenue	835	830	1,694	1,687
Financial Services | Intersegment net revenue and other
Segment Reporting Information [Line Items]
Net revenue	(4)	(3)	(5)	(5)
Financial Services | Operating Segment
Segment Reporting Information [Line Items]
Net revenue	839	833	1,699	1,692
Segment earnings (loss) from operations	91	77	175	152
Corporate Investments and Other
Segment Reporting Information [Line Items]
Net revenue	350	327	671	654
Corporate Investments and Other | Intersegment net revenue and other
Segment Reporting Information [Line Items]
Net revenue	0	(1)	0	(1)
Corporate Investments and Other | Operating Segment
Segment Reporting Information [Line Items]
Net revenue	350	328	671	655
Segment earnings (loss) from operations	$ (25)	$ (51)	$ (56)	$ (104)

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