ACQUISITIONS - Intangible Assets Acquired (Details) - USD ($) $ in Millions	Aug. 23, 2019	Jan. 31, 2020	Oct. 31, 2019
Business Acquisition [Line Items]
Gross Carrying Amount		$ 2,085	$ 2,086
BioTek
Business Acquisition [Line Items]
Gross Carrying Amount	$ 637
In-Process R&D	4
Total Intangible Assets, Gross (Excluding Goodwill)	641
Developed Product Technology
Business Acquisition [Line Items]
Gross Carrying Amount		1,412	1,413
Developed Product Technology | BioTek
Business Acquisition [Line Items]
Gross Carrying Amount	387
Customer Relationships
Business Acquisition [Line Items]
Gross Carrying Amount		329	329
Customer Relationships | BioTek
Business Acquisition [Line Items]
Gross Carrying Amount	202
Backlog
Business Acquisition [Line Items]
Gross Carrying Amount		$ 5	$ 5
Backlog | BioTek
Business Acquisition [Line Items]
Gross Carrying Amount	$ 5
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	2 months
Trademarks and Trade Names | BioTek
Business Acquisition [Line Items]
Gross Carrying Amount	$ 43
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
Minimum | Developed Product Technology | BioTek
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years
Minimum | Customer Relationships | BioTek
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years
Maximum | Developed Product Technology | BioTek
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	13 years
Maximum | Customer Relationships | BioTek
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	8 years