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FAIR VALUE MEASUREMENTS, Fair value of assets and liabilities measured on a recurring basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Apr. 30, 2019	Oct. 31, 2018
Assets Short - term [Abstract]
Money market funds	$ 754	$ 484
Derivative instruments (foreign exchange contracts)	2	6
Assets, Long-term [Abstract]
Equity investments	33	30
Equity investments - other	9	16
Total assets measured at fair value	798	536
Liabilities, Short-term [Abstract]
Derivative instruments (foreign exchange contracts)	4	6
Liabilities Long-term [Abstract]
Deferred compensation liability	13	13
Total liabilities measured at fair value	17	19
Level 1
Assets Short - term [Abstract]
Money market funds	754	484
Derivative instruments (foreign exchange contracts)	0	0
Assets, Long-term [Abstract]
Equity investments	33	30
Equity investments - other	0	0
Total assets measured at fair value	787	514
Liabilities, Short-term [Abstract]
Derivative instruments (foreign exchange contracts)	0	0
Liabilities Long-term [Abstract]
Deferred compensation liability	0	0
Total liabilities measured at fair value	0	0
Level 2
Assets Short - term [Abstract]
Money market funds	0	0
Derivative instruments (foreign exchange contracts)	2	6
Assets, Long-term [Abstract]
Equity investments	0	0
Equity investments - other	0	0
Total assets measured at fair value	2	6
Liabilities, Short-term [Abstract]
Derivative instruments (foreign exchange contracts)	4	6
Liabilities Long-term [Abstract]
Deferred compensation liability	13	13
Total liabilities measured at fair value	17	19
Level 3
Assets Short - term [Abstract]
Money market funds	0	0
Derivative instruments (foreign exchange contracts)	0	0
Assets, Long-term [Abstract]
Equity investments	0	0
Equity investments - other	0	0
Total assets measured at fair value	0	0
Liabilities, Short-term [Abstract]
Derivative instruments (foreign exchange contracts)	0	0
Liabilities Long-term [Abstract]
Deferred compensation liability	0	0
Total liabilities measured at fair value	$ 0	$ 0

X

- Definition

This element represents a certain statement of financial position liability which deferred compensation liability, measured at fair value on a recurring basis.

+ References

No definition available.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117539-209714

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- Definition

Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

+ References

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Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- Definition

Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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