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GOODWILL AND OTHER INTANGIBLE ASSETS (Finite-Lived Assets and Future Amortization Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
Goodwill [Line Items] |  |  |
Goodwill impairment | $ 0 | $ 709 | $ 0
Goodwill arising from acquisitions | 30 | 6 |
Intangible assets acquired from an acquisition | 56 |  |
Finite-Lived Intangible Assets, Translation Adjustments | 1 |  |
Finite-Lived Intangible Assets, Period Increase (Decrease) | 23 |  |
Amortization of Intangible Assets | 210 | 204 | $ 131
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | 5 |  |
Amortization Expense, Maturity Schedule [Abstract] |  |  |
2020 | 211 |  |
2021 | 143 |  |
2022 | 67 |  |
2023 | 49 |  |
2024 | 17 |  |
Thereafter | 1 |  |
Ixia Solutions Group [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill impairment |  | 709 |
Goodwill arising from acquisitions | $ 0 | $ 0 |

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