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Acquisitions - Aggregate Purchase Price Allocation (Details) - USD ($) $ in Millions	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Business Acquisition, Contingent Consideration [Line Items]
Goodwill	$ 18,306	$ 18,017	$ 18,306
2021 Acquisitions
Business Acquisition, Contingent Consideration [Line Items]
Goodwill	300
Net tangible liabilities assumed	(5)
Total fair value consideration	568
2021 Acquisitions | Intangible Assets
Business Acquisition, Contingent Consideration [Line Items]
Amortizable intangible assets	262
2021 Acquisitions | In-process research and development
Business Acquisition, Contingent Consideration [Line Items]
Amortizable intangible assets	$ 11
2020 Acquisitions
Business Acquisition, Contingent Consideration [Line Items]
Goodwill		561
Net tangible liabilities assumed		(29)
Total fair value consideration		886
2020 Acquisitions | Intangible Assets
Business Acquisition, Contingent Consideration [Line Items]
Amortizable intangible assets		$ 354
2019 Acquisitions
Business Acquisition, Contingent Consideration [Line Items]
Goodwill			771
Net tangible liabilities assumed			(235)
Total fair value consideration			1,612
2019 Acquisitions | Intangible Assets
Business Acquisition, Contingent Consideration [Line Items]
Amortizable intangible assets			465
2019 Acquisitions | In-process research and development
Business Acquisition, Contingent Consideration [Line Items]
Amortizable intangible assets			$ 141

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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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