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FAIR VALUE MEASUREMENTS, Fair value measures and impairments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2021 | Apr. 30, 2020 | Oct. 31, 2020
Investments |  |  |  |  |
Impairment of Investments | $ 0 | $ 0 | $ 0 | $ 0 |
Long-Lived Assets |  |  |  |  |
Carrying value of impaired long-lived assets held for use | 2 | 98 | 2 | 98 |
Fair value of impaired long-lived assets held for use | 0 | 0 | 0 | 0 |
Impairment of Long-Lived Assets Held-for-use | 2 | 98 | 2 | 98 |
Impairment of Long-Lived assets Held for sale | 0 | 0 | 0 | 0 |
Equity Securities |  |  |  |  |
Impairment of non-marketable securities | 0 | 0 | 0 | 0 |
Unrealized gain on equity securities |  |  | 11 | 27 |
Non-marketable equity securities carrying amount | 111 |  | 111 |  | $ 103
Fair Value, Nonrecurring |  |  |  |  |
Equity Securities |  |  |  |  |
Unrealized gain on equity securities | 0 | 11 | 0 | 27 |
Fair Value, Measurements, Recurring |  |  |  |  |
Equity Securities |  |  |  |  |
Unrealized gain on equity securities | $ 11 | $ 0 | $ 11 | $ 0 |

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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117546-209714 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=121553693&loc=SL6284422-111562 + Details
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