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Financial Instruments (Details) - USD ($)
$ in Millions
6 Months Ended
Apr. 30, 2016
Oct. 31, 2015
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Cost $ 40 $ 35
Available-for-sale securities, Gross Unrealized Gain 14 14
Available-for-sale securities, Estimated Fair Value 54 49
Cost    
Cash equivalents and available-for-sale investments    
Cash equivalents 3,037 5,414
Total cash equivalents and available-for-sale investments 3,077 5,449
Fair Value    
Cash equivalents and available-for-sale investments    
Cash equivalents 3,037 5,414
Total cash equivalents and available-for-sale investments 3,091 5,463
Equity securities in public companies    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Gross Unrealized Gain 4 4
Equity securities in public companies | Cost    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Cost 1 1
Equity securities in public companies | Fair Value    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Estimated Fair Value 5 5
Foreign bonds    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Gross Unrealized Gain 10 10
Foreign bonds | Cost    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Cost 37 32
Foreign bonds | Fair Value    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Estimated Fair Value 47 42
Other debt securities | Cost    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Cost 2 2
Other debt securities | Fair Value    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Estimated Fair Value $ 2 2
Minimum | Cash flow hedges    
Cash equivalents and available-for-sale investments    
Term of hedged lease or loan 2 years  
Maximum | Cash flow hedges    
Cash equivalents and available-for-sale investments    
Term of hedged lease or loan 5 years  
Time deposits | Cost    
Cash equivalents and available-for-sale investments    
Cash equivalents $ 1,383 1,111
Time deposits | Fair Value    
Cash equivalents and available-for-sale investments    
Cash equivalents 1,383 1,111
Money market funds | Cost    
Cash equivalents and available-for-sale investments    
Cash equivalents 1,654 4,303
Money market funds | Fair Value    
Cash equivalents and available-for-sale investments    
Cash equivalents $ 1,654 $ 4,303