Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Goodwill (Details) $ in Millions	3 Months Ended		6 Months Ended
Goodwill (Details) $ in Millions	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)	Apr. 30, 2020 USD ($) segment	Apr. 30, 2019 USD ($)
Goodwill [Roll Forward]
Goodwill beginning balance			$ 18,306
Goodwill impairment	$ (865)	$ 0	(865)	$ 0
Goodwill adjustments			3
Goodwill ending balance	17,444		17,444
Goodwill	17,444		$ 18,306
Number of segments \| segment			7
Compute
Goodwill [Roll Forward]
Goodwill beginning balance			$ 7,532
Goodwill impairment			0
Goodwill adjustments			0
Goodwill ending balance	7,532		7,532
Goodwill	7,532		7,532
HPC & MCS
Goodwill [Roll Forward]
Goodwill beginning balance			4,478
Goodwill impairment	(865)		(865)
Goodwill adjustments			2
Goodwill ending balance	3,615		3,615
Goodwill	3,615		3,615
Storage
Goodwill [Roll Forward]
Goodwill beginning balance			4,158
Goodwill impairment			0
Goodwill adjustments			1
Goodwill ending balance	4,159		4,159
Goodwill	4,159		4,159
Intelligent Edge
Goodwill [Roll Forward]
Goodwill beginning balance			1,994
Goodwill impairment			0
Goodwill adjustments			0
Goodwill ending balance	1,994		1,994
Goodwill	1,994		1,994
Financial Services
Goodwill [Roll Forward]
Goodwill beginning balance			144
Goodwill impairment			0
Goodwill adjustments			0
Goodwill ending balance	144		144
Goodwill	$ 144		$ 144