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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 $ 35 $ 149  
Available-for-sale securities, Gross Unrealized Gain 14 33  
Available-for-sale securities, Gross Unrealized Loss   (14)  
Available-for-sale securities, Estimated Fair Value 49 168  
Interest income 75 72 $ 76
Debt securities:      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Gross Unrealized Gain 10 29  
Available-for-sale securities, Gross Unrealized Loss   (14)  
Gross unrealized loss of debt security in a continuous loss position for more than 12 months 0 14  
Foreign bonds      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Gross Unrealized Gain 10 29  
Other debt securities      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Gross Unrealized Loss   (14)  
Marketable equity securities      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Gross Unrealized Gain 4 4  
Equity securities in public companies      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Gross Unrealized Gain 4 4  
Cost      
Cash equivalents and available-for-sale investments      
Cash equivalents 5,414 10,901  
Total cash equivalents and available-for-sale investments 5,449 11,050  
Cost | Debt securities:      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost 34 146  
Cost | Foreign bonds      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost 32 95  
Cost | Other debt securities      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost 2 51  
Cost | Marketable equity securities      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost 1 3  
Cost | Equity securities in public companies      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost 1 3  
Cost | Time deposits      
Cash equivalents and available-for-sale investments      
Cash equivalents 1,111 1,735  
Cost | Money market funds      
Cash equivalents and available-for-sale investments      
Cash equivalents 4,303 9,166  
Fair Value      
Cash equivalents and available-for-sale investments      
Cash equivalents 5,414 10,901  
Total cash equivalents and available-for-sale investments 5,463 11,069  
Fair Value | Debt securities:      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Estimated Fair Value 44 161  
Fair Value | Foreign bonds      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Estimated Fair Value 42 124  
Fair Value | Other debt securities      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Estimated Fair Value 2 37  
Fair Value | Marketable equity securities      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Estimated Fair Value 5 7  
Fair Value | Equity securities in public companies      
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Estimated Fair Value 5 7  
Fair Value | Time deposits      
Cash equivalents and available-for-sale investments      
Cash equivalents 1,111 1,735  
Fair Value | Money market funds      
Cash equivalents and available-for-sale investments      
Cash equivalents $ 4,303 $ 9,166