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ACQUISITIONS (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 18, 2017 | Jul. 31, 2019 | Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017 | Jun. 14, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | $ 88 | $ 5 | $ 1,702 |
Deferred tax liability for intangible assets |  |  | 38 | 66 |  |
Acquisition related compensation expense paid in cash |  |  | $ 0 | $ 0 | $ (28) |
Prisma [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  | $ 88 |  |  |  |
Cash and cash equivalents |  |  |  |  |  | $ 56
Ixia [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition effective date |  |  |  | Apr. 18, 2017 |  |
Business Acquisition, Date of Acquisition Agreement |  |  |  | Jan. 30, 2017 |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 1,622 |  |  |  |  |
Deferred tax liability for intangible assets | 186 |  |  |  |  |
Estimated cost to complete in process research and development | 12 |  |  |  |  |
Cash and cash equivalents | $ 72 |  |  |  |  |
Business Acquisition, Share Price | $ 19.65 |  |  |  |  |
Business Combination, Consideration Transferred, Other | $ 47 |  |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount | $ 48 |  |  |  |  |
Discount rate used to value In Process R&D | 14.00% |  |  |  |  |

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