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FAIR VALUE MEASUREMENTS, Fair value of assets and liabilities measured on a recurring basis (Details) - USD ($)
$ in Millions
Oct. 31, 2020
Oct. 31, 2019
Assets, Long-term [Abstract]    
Trading securities $ 30 $ 30
Fair Value, Recurring    
Assets, Short-term [Abstract]    
Cash equivalents (money market funds) 740 784
Derivative instruments (foreign exchange contracts) 2 12
Assets, Long-term [Abstract]    
Trading securities 30 30
Other investments 25 25
Total assets measured at fair value 797 851
Liabilities, Short-term [Abstract]    
Derivative instruments (foreign exchange contracts) 17 6
Liabilities, Long-term [Abstract]    
Deferred compensation liability 30 30
Total liabilities measured at fair value 47 36
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets, Short-term [Abstract]    
Cash equivalents (money market funds) 740 784
Derivative instruments (foreign exchange contracts) 0 0
Assets, Long-term [Abstract]    
Trading securities 30 30
Other investments 0 0
Total assets measured at fair value 770 814
Liabilities, Short-term [Abstract]    
Derivative instruments (foreign exchange contracts) 0 0
Liabilities, Long-term [Abstract]    
Deferred compensation liability 0 0
Total liabilities measured at fair value 0 0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2)    
Assets, Short-term [Abstract]    
Cash equivalents (money market funds) 0 0
Derivative instruments (foreign exchange contracts) 2 12
Assets, Long-term [Abstract]    
Trading securities 0 0
Other investments 25 25
Total assets measured at fair value 27 37
Liabilities, Short-term [Abstract]    
Derivative instruments (foreign exchange contracts) 17 6
Liabilities, Long-term [Abstract]    
Deferred compensation liability 30 30
Total liabilities measured at fair value 47 36
Fair Value, Recurring | Significant Unobservable Inputs (Level 3)    
Assets, Short-term [Abstract]    
Cash equivalents (money market funds) 0 0
Derivative instruments (foreign exchange contracts) 0 0
Assets, Long-term [Abstract]    
Trading securities 0 0
Other investments 0 0
Total assets measured at fair value 0 0
Liabilities, Short-term [Abstract]    
Derivative instruments (foreign exchange contracts) 0 0
Liabilities, Long-term [Abstract]    
Deferred compensation liability 0 0
Total liabilities measured at fair value $ 0 $ 0