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FAIR VALUE MEASUREMENTS, Fair value measures and impairments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018	Oct. 31, 2018
Long-Lived Assets
Impairment of Long-Lived Assets Held-for-use	$ 0	$ 0	$ 0	$ 0
Impairment of non-marketable securities	0		0
Impairment of long-lived assets held for sale	0	0	0	0
Non-marketable equity securities carrying amount	45		45		$ 23
Investments
Impairment of Investments	$ 0	$ 0	$ 0	$ 0

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- Definition

Assets Long Lived [Abstract]

+ References

No definition available.

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- Definition

Amount of investment in equity security without readily determinable fair value.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
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- Definition

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

+ References

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- Definition

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.

+ References

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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