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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, 2021 | Oct. 31, 2020
--- | --- | ---
Assets, Long-term |  |
Total assets measured at fair value | $ 612 | $ 797
Liabilities Long-term |  |
Total liabilities measured at fair value | 148 | 47
Other Current Assets |  |
Assets Short - term |  |
Cash equivalents (money market funds) | 526 | 740
Derivative instruments (foreign exchange contracts) | 10 | 2
Other assets |  |
Assets, Long-term |  |
Trading securities | 33 | 30
Other investments | 43 | 25
Other accrued liabilities |  |
Liabilities, Short-term |  |
Derivative instruments (foreign exchange contracts) | 19 | 17
Liabilities Long-term |  |
Contingent consideration liability | 47 | 0
Other long-term liabilities |  |
Liabilities Long-term |  |
Deferred compensation liability | 33 | 30
Contingent consideration liability | 49 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets, Long-term |  |
Total assets measured at fair value | 572 | 770
Liabilities Long-term |  |
Total liabilities measured at fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Current Assets |  |
Assets Short - term |  |
Cash equivalents (money market funds) | 526 | 740
Derivative instruments (foreign exchange contracts) | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other assets |  |
Assets, Long-term |  |
Trading securities | 33 | 30
Other investments | 13 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other accrued liabilities |  |
Liabilities, Short-term |  |
Derivative instruments (foreign exchange contracts) | 0 | 0
Liabilities Long-term |  |
Contingent consideration liability | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other long-term liabilities |  |
Liabilities Long-term |  |
Deferred compensation liability | 0 | 0
Contingent consideration liability | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets, Long-term |  |
Total assets measured at fair value | 40 | 27
Liabilities Long-term |  |
Total liabilities measured at fair value | 52 | 47
Significant Other Observable Inputs (Level 2) | Other Current Assets |  |
Assets Short - term |  |
Cash equivalents (money market funds) | 0 | 0
Derivative instruments (foreign exchange contracts) | 10 | 2
Significant Other Observable Inputs (Level 2) | Other assets |  |
Assets, Long-term |  |
Trading securities | 0 | 0
Other investments | 30 | 25
Significant Other Observable Inputs (Level 2) | Other accrued liabilities |  |
Liabilities, Short-term |  |
Derivative instruments (foreign exchange contracts) | 19 | 17
Liabilities Long-term |  |
Contingent consideration liability | 0 | 0
Significant Other Observable Inputs (Level 2) | Other long-term liabilities |  |
Liabilities Long-term |  |
Deferred compensation liability | 33 | 30
Contingent consideration liability | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Assets, Long-term |  |
Total assets measured at fair value | 0 | 0
Liabilities Long-term |  |
Contingent consideration liability | 96 |
Total liabilities measured at fair value | 96 | 0
Significant Unobservable Inputs (Level 3) | Other Current Assets |  |
Assets Short - term |  |
Cash equivalents (money market funds) | 0 | 0
Derivative instruments (foreign exchange contracts) | 0 | 0
Significant Unobservable Inputs (Level 3) | Other assets |  |
Assets, Long-term |  |
Trading securities | 0 | 0
Other investments | 0 | 0
Significant Unobservable Inputs (Level 3) | Other accrued liabilities |  |
Liabilities, Short-term |  |
Derivative instruments (foreign exchange contracts) | 0 | 0
Liabilities Long-term |  |
Contingent consideration liability |  | 0
Significant Unobservable Inputs (Level 3) | Other accrued liabilities | Resolution Bioscience, Inc. |  |
Liabilities Long-term |  |
Contingent consideration liability | 47 |
Significant Unobservable Inputs (Level 3) | Other long-term liabilities |  |
Liabilities Long-term |  |
Deferred compensation liability | 0 | 0
Contingent consideration liability |  | $ 0
Significant Unobservable Inputs (Level 3) | Other long-term liabilities | Resolution Bioscience, Inc. |  |
Liabilities Long-term |  |
Contingent consideration liability | $ 49 |

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