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Financial Instruments (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2013
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost $ 568 $ 634  
Available-for-sale securities, Gross Unrealized Gain 88 97  
Available-for-sale securities, Gross Unrealized Loss (22) (14)  
Available-for-sale securities, Estimated Fair Value   717  
Interest income 129 136 $ 148
Cost      
Cash equivalents and available-for-sale investments      
Cash equivalents 12,546 12,687  
Total cash equivalents and available-for-sale investments 13,114 13,321  
Fair Value      
Cash equivalents and available-for-sale investments      
Cash equivalents   12,687  
Available-for-sale securities, Estimated Fair Value 634    
Total cash equivalents and available-for-sale investments 13,180 13,404  
Debt securities:      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Gross Unrealized Gain 79 90  
Available-for-sale securities, Gross Unrealized Loss (13) (14)  
Gross unrealized loss of debt security in a continuous loss position for more than 12 months 13 14  
Debt securities: | Cost      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost 437 492  
Debt securities: | Fair Value      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Estimated Fair Value 503 568  
Time deposits | Cost      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost 106 145  
Time deposits | Fair Value      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Estimated Fair Value 106 145  
Foreign bonds      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Gross Unrealized Gain 79 90  
Foreign bonds | Cost      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost 276 286  
Foreign bonds | Fair Value      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Estimated Fair Value 355 376  
Other debt securities      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Gross Unrealized Loss (13) (14)  
Other debt securities | Cost      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost 55 61  
Other debt securities | Fair Value      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Estimated Fair Value 42 47  
Marketable equity securities      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Gross Unrealized Gain 9 7  
Available-for-sale securities, Gross Unrealized Loss (9)    
Marketable equity securities | Cost      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost 131 142  
Marketable equity securities | Fair Value      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Estimated Fair Value 131 149  
Mutual funds | Cost      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost 73 134  
Mutual funds | Fair Value      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Estimated Fair Value 73 134  
Equity securities in public companies      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Gross Unrealized Gain 9 7  
Available-for-sale securities, Gross Unrealized Loss (9)    
Equity securities in public companies | Cost      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost 58 8  
Equity securities in public companies | Fair Value      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Estimated Fair Value 58 15  
Time deposits | Cost      
Cash equivalents and available-for-sale investments      
Cash equivalents 3,478 2,720  
Time deposits | Fair Value      
Cash equivalents and available-for-sale investments      
Cash equivalents 3,478 2,720  
Money market funds | Cost      
Cash equivalents and available-for-sale investments      
Cash equivalents 8,895 9,857  
Money market funds | Fair Value      
Cash equivalents and available-for-sale investments      
Cash equivalents 8,895 9,857  
Mutual funds | Cost      
Cash equivalents and available-for-sale investments      
Cash equivalents 173 110  
Mutual funds | Fair Value      
Cash equivalents and available-for-sale investments      
Cash equivalents $ 173 $ 110