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FAIR VALUE MEASUREMENTS, Fair value measures and impairments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2021 | Jul. 31, 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 |
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 (loss) on equity securities |  |  | 19 | 26 |
Non-marketable equity securities carrying amount | $ 130 |  | $ 130 |  | $ 103
Measurement Input, Asset Volatility |  |  |  |  |
Contingent Consideration Liability |  |  |  |  |
Business Combination Contingent Consideration Liability Measurement Input | 54.90% |  | 54.90% |  |
Measurement Input, Revenue Volatility | Minimum |  |  |  |  |
Contingent Consideration Liability |  |  |  |  |
Business Combination Contingent Consideration Liability Measurement Input | 10.40% |  | 10.40% |  |
Measurement Input, Revenue Volatility | Maximum |  |  |  |  |
Contingent Consideration Liability |  |  |  |  |
Business Combination Contingent Consideration Liability Measurement Input | 12.80% |  | 12.80% |  |
Fair Value, Nonrecurring |  |  |  |  |
Equity Securities |  |  |  |  |
Unrealized gain (loss) on equity securities | $ 11 | (1) | $ 11 | $ 26 |
Fair Value, Measurements, Recurring |  |  |  |  |
Equity Securities |  |  |  |  |
Unrealized gain (loss) on equity securities | $ (3) | $ 0 | $ 8 |  |

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