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FAIR VALUE MEASUREMENTS -Contingent Consideration (Details) - USD ($) $ in Millions | Apr. 30, 2021 | Oct. 31, 2020
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Fair Value, Measurements, Recurring | Other accrued liabilities |  |
Fair Value Disclosures [Abstract] |  |
Contingent consideration liability | $ 47 | $ 0
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration liability | 47 | 0
Fair Value, Measurements, Recurring | Other long-term liabilities |  |
Fair Value Disclosures [Abstract] |  |
Contingent consideration liability | 49 | 0
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration liability | 49 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |
Fair Value Disclosures [Abstract] |  |
Contingent consideration liability | 96 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration liability | 96 |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Other accrued liabilities |  |
Fair Value Disclosures [Abstract] |  |
Contingent consideration liability |  | 0
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration liability |  | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Other accrued liabilities | Resolution Bioscience, Inc. |  |
Fair Value Disclosures [Abstract] |  |
Contingent consideration liability | 47 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration liability | 47 |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Other long-term liabilities |  |
Fair Value Disclosures [Abstract] |  |
Contingent consideration liability |  | 0
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration liability |  | $ 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Other long-term liabilities | Resolution Bioscience, Inc. |  |
Fair Value Disclosures [Abstract] |  |
Contingent consideration liability | 49 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration liability | $ 49 |
Measurement Input, Asset Volatility |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Business Combination Contingent Consideration Liability Measurement Input | 54.90% |
Measurement Input, Revenue Volatility | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Business Combination Contingent Consideration Liability Measurement Input | 13.80% |
Measurement Input, Revenue Volatility | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Business Combination Contingent Consideration Liability Measurement Input | 14.00% |

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