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