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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	Jul. 31, 2020	Oct. 31, 2019
Assets Short - term [Abstract]
Money market funds	$ 1,054	$ 932
Derivative instruments (foreign exchange contracts)	7	2
Assets, Long-term [Abstract]
Equity investments	52	37
Equity investments - other	9	9
Total assets measured at fair value	1,122	980
Liabilities, Short-term [Abstract]
Derivative instruments (foreign exchange contracts)	9	6
Liabilities Long-term [Abstract]
Deferred compensation liability	17	14
Interest Rate Derivative Liabilities, at Fair Value	7	0
Total liabilities measured at fair value	33	20
Level 1
Assets Short - term [Abstract]
Money market funds	1,054	932
Derivative instruments (foreign exchange contracts)	0	0
Assets, Long-term [Abstract]
Equity investments	52	37
Equity investments - other	0	0
Total assets measured at fair value	1,106	969
Liabilities, Short-term [Abstract]
Derivative instruments (foreign exchange contracts)	0	0
Liabilities Long-term [Abstract]
Deferred compensation liability	0	0
Interest Rate Derivative Liabilities, at Fair Value	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)	7	2
Assets, Long-term [Abstract]
Equity investments	0	0
Equity investments - other	0	0
Total assets measured at fair value	7	2
Liabilities, Short-term [Abstract]
Derivative instruments (foreign exchange contracts)	9	6
Liabilities Long-term [Abstract]
Deferred compensation liability	17	14
Interest Rate Derivative Liabilities, at Fair Value	7	0
Total liabilities measured at fair value	33	20
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
Interest Rate Derivative Liabilities, at Fair Value	0	0
Total liabilities measured at fair value	$ 0	$ 0

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- 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=117815213&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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Amount of investment in equity security without readily determinable fair value.

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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=120269885&loc=SL75117539-209714

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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.

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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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Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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- Definition

Fair value of financial and nonfinancial obligations.

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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=117815213&loc=d3e19207-110258

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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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