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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Apr. 30, 2020	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Goodwill
Goodwill impairment measurement input		10.00%
Goodwill		$ 18,306	$ 18,017	$ 18,306
Goodwill impairment loss			865
Decrease in gross intangible assets		409
Gross intangible assets acquired		$ 273
Minimum
Goodwill
Percentage of fair value in excess of carrying amount		8.00%
Maximum
Goodwill
Percentage of fair value in excess of carrying amount		133.00%
In-process research and development
Goodwill
Reclassified			0
Developed and core technology and patents
Goodwill
Reclassified		$ 113
HPC & AI
Goodwill
Percentage of fair value in excess of carrying amount		8.00%
Goodwill		$ 3,702	3,616	$ 4,478
Goodwill impairment loss	$ 865		$ 865

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