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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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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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