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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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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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