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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
Jul. 31, 2017
Oct. 31, 2016
Assets Short - term    
Cash equivalents (money market funds) $ 1,549 $ 1,482
Derivative instruments (foreign exchange contracts) 7 9
Assets, Long-term    
Trading securities 31 31
Total assets measured at fair value 1,587 1,522
Liabilities, Short-term    
Derivative instruments (foreign exchange contracts) 8 8
Liabilities Long-term    
Deferred compensation liability 31 31
Total liabilities measured at fair value 39 39
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets Short - term    
Cash equivalents (money market funds) 1,549 1,482
Derivative instruments (foreign exchange contracts) 0 0
Assets, Long-term    
Trading securities 31 31
Total assets measured at fair value 1,580 1,513
Liabilities, Short-term    
Derivative instruments (foreign exchange contracts) 0 0
Liabilities Long-term    
Deferred compensation liability 0 0
Total liabilities measured at fair value 0 0
Significant Other Observable Inputs (Level 2)    
Assets Short - term    
Cash equivalents (money market funds) 0 0
Derivative instruments (foreign exchange contracts) 7 9
Assets, Long-term    
Trading securities 0 0
Total assets measured at fair value 7 9
Liabilities, Short-term    
Derivative instruments (foreign exchange contracts) 8 8
Liabilities Long-term    
Deferred compensation liability 31 31
Total liabilities measured at fair value 39 39
Significant Unobservable Inputs (Level 3)    
Assets Short - term    
Cash equivalents (money market funds) 0 0
Derivative instruments (foreign exchange contracts) 0 0
Assets, Long-term    
Trading securities 0 0
Total assets measured at fair value 0 0
Liabilities, Short-term    
Derivative instruments (foreign exchange contracts) 0 0
Liabilities Long-term    
Deferred compensation liability 0 0
Total liabilities measured at fair value $ 0 $ 0