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Transformation Programs - Transformation Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Restructuring Cost and Reserve [Line Items]
Total	$ 209	$ 200	$ 520	$ 289
HPE Next
Restructuring Cost and Reserve [Line Items]
Program management	3	7	5	18
IT costs	46	18	72	46
Restructuring charges	2	164	19	248
(Gain) loss on real estate sales	(2)	4	(3)	(37)
Impairment on real estate assets	4	0	4	0
Other	5	7	20	14
Total	58	$ 200	117	$ 289
Cost optimization and prioritization plan
Restructuring Cost and Reserve [Line Items]
Program management	18		55
IT costs	3		3
Restructuring charges	132		347
Total	$ 153		$ 405

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