FAIR VALUE MEASUREMENTS -Contingent Consideration (Details) - USD ($) $ in Millions	Apr. 30, 2021	Oct. 31, 2020
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%