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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, 2018 | Oct. 31, 2017
--- | --- | ---
Assets Short - term |  |
Cash equivalents (money market funds) | $ 2,171 | $ 1,659
Derivative instruments (foreign exchange contracts) | 6 | 4
Assets, Long-term |  |
Trading securities | 30 | 32
Total assets measured at fair value | 2,207 | 1,695
Liabilities, Short-term |  |
Derivative instruments (foreign exchange contracts) | 8 | 6
Liabilities Long-term |  |
Deferred compensation liability | 30 | 32
Total liabilities measured at fair value | 38 | 38
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets Short - term |  |
Cash equivalents (money market funds) | 2,171 | 1,659
Derivative instruments (foreign exchange contracts) | 0 | 0
Assets, Long-term |  |
Trading securities | 30 | 32
Total assets measured at fair value | 2,201 | 1,691
Liabilities, Short-term |  |
Derivative instruments (foreign exchange contracts) | 0 | 0
Liabilities Long-term |  |
Deferred compensation liability | 0 | 0
Total liabilities measured at fair value | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets Short - term |  |
Cash equivalents (money market funds) | 0 | 0
Derivative instruments (foreign exchange contracts) | 6 | 4
Assets, Long-term |  |
Trading securities | 0 | 0
Total assets measured at fair value | 6 | 4
Liabilities, Short-term |  |
Derivative instruments (foreign exchange contracts) | 8 | 6
Liabilities Long-term |  |
Deferred compensation liability | 30 | 32
Total liabilities measured at fair value | 38 | 38
Significant Unobservable Inputs (Level 3) |  |
Assets Short - term |  |
Cash equivalents (money market funds) | 0 | 0
Derivative instruments (foreign exchange contracts) | 0 | 0
Assets, Long-term |  |
Trading securities | 0 | 0
Total assets measured at fair value | 0 | 0
Liabilities, Short-term |  |
Derivative instruments (foreign exchange contracts) | 0 | 0
Liabilities Long-term |  |
Deferred compensation liability | 0 | 0
Total liabilities measured at fair value | $ 0 | $ 0

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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