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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
Apr. 30, 2018
Oct. 31, 2017
Assets Short - term    
Cash equivalents (money market funds) $ 2,171 $ 1,659
Derivative instruments (foreign exchange contracts) 6 4
Assets, Long-term    
Trading securities 30 32
Total assets measured at fair value 2,207 1,695
Liabilities, Short-term    
Derivative instruments (foreign exchange contracts) 8 6
Liabilities Long-term    
Deferred compensation liability 30 32
Total liabilities measured at fair value 38 38
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets Short - term    
Cash equivalents (money market funds) 2,171 1,659
Derivative instruments (foreign exchange contracts) 0 0
Assets, Long-term    
Trading securities 30 32
Total assets measured at fair value 2,201 1,691
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) 6 4
Assets, Long-term    
Trading securities 0 0
Total assets measured at fair value 6 4
Liabilities, Short-term    
Derivative instruments (foreign exchange contracts) 8 6
Liabilities Long-term    
Deferred compensation liability 30 32
Total liabilities measured at fair value 38 38
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