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ACQUISITIONS (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired			$ 357	$ 88	$ 5
Goodwill arising from acquisitions			314	30
Intangible assets acquired from an acquisition			88	$ 56
Eggplant
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 319
Cash acquired from acquisition	11
Goodwill arising from acquisitions	280
Intangible assets acquired from an acquisition	88
Prisma
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired		$ 88
Cash acquired from acquisition		56
Goodwill arising from acquisitions		30
Intangible assets acquired from an acquisition		56
Others
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired			38
Goodwill arising from acquisitions			$ 34
Developed Technology | Eggplant
Business Acquisition [Line Items]
Intangible assets acquired from an acquisition	$ 38
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years
Developed Technology | Prisma
Business Acquisition [Line Items]
Intangible assets acquired from an acquisition		$ 42
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		4 years
Customer Relationships | Eggplant
Business Acquisition [Line Items]
Intangible assets acquired from an acquisition	$ 46
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 years

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