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FAIR VALUE MEASUREMENTS, Fair value measures and impairments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019	Oct. 31, 2019
Long-Lived Assets
Carrying value of impaired long-lived assets held for use	$ 98		$ 98
Fair value of impaired long-lived assets held for use	0		0
Impairment of Long-Lived Assets Held-for-use	98	$ 0	98	$ 0
Impairment of Long-Lived assets Held for sale	0	0	0	0
Investments
Impairment of Investments	0	0	0	0
Non-Marketable Equity Securities without Readily Determinable Fair Value
Impairment of non-marketable securities	0		0
Unrealized Gain on non-marketable equity securities	11	$ 0	27	$ 1
Non-marketable equity securities carrying amount	$ 91		$ 91		$ 47

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Assets Long Lived [Abstract]

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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 investment in equity security without readily determinable fair value.

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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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