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FAIR VALUE MEASUREMENTS, Fair value measures and impairments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020	Oct. 31, 2020
Investments
Impairment of Investments	$ 0	$ 0	$ 0	$ 0
Long-Lived Assets
Carrying value of impaired long-lived assets held for use	2	98	2	98
Fair value of impaired long-lived assets held for use	0	0	0	0
Impairment of Long-Lived Assets Held-for-use			2	98
Impairment of Long-Lived assets Held for sale	0	0	0	0
Equity Securities
Impairment of non-marketable securities	0	0	0	0
Unrealized gain (loss) on equity securities			19	26
Non-marketable equity securities carrying amount	$ 130		$ 130		$ 103
Measurement Input, Asset Volatility
Contingent Consideration Liability
Business Combination Contingent Consideration Liability Measurement Input	54.90%		54.90%
Measurement Input, Revenue Volatility | Minimum
Contingent Consideration Liability
Business Combination Contingent Consideration Liability Measurement Input	10.40%		10.40%
Measurement Input, Revenue Volatility | Maximum
Contingent Consideration Liability
Business Combination Contingent Consideration Liability Measurement Input	12.80%		12.80%
Fair Value, Nonrecurring
Equity Securities
Unrealized gain (loss) on equity securities	$ 11	(1)	$ 11	$ 26
Fair Value, Measurements, Recurring
Equity Securities
Unrealized gain (loss) on equity securities	$ (3)	$ 0	$ 8

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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of cumulative impairment loss on investment in equity security without readily determinable fair value.

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The carrying amount on the books of the entity of the impaired asset to be disposed of by a method other than sale.

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Fair value portion of other assets.

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