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Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2011
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost $ 693 $ 834  
Available-for-sale securities, Gross Unrealized Gain 92 91  
Available-for-sale securities, Gross Unrealized Loss (15) (17)  
Available-for-sale securities, Estimated Fair Value 770 908  
Interest income 148 155 167
Cost
     
Cash equivalents and available-for-sale investments      
Cash equivalents 9,039 8,332  
Total cash equivalents and available-for-sale investments 9,732 9,166  
Fair Value
     
Cash equivalents and available-for-sale investments      
Cash equivalents 9,039 8,332  
Total cash equivalents and available-for-sale investments 9,809 9,240  
Debt securities:
     
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Gross Unrealized Gain 86 82  
Available-for-sale securities, Gross Unrealized Loss (15) (17)  
Gross unrealized loss of debt security in a continuous loss position for more than 12 months 15 17  
Debt securities: | Cost
     
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost 388 384  
Debt securities: | Fair Value
     
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Estimated Fair Value 459 449  
Time deposits | Cost
     
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost 14 8  
Time deposits | Fair Value
     
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Estimated Fair Value 14 8  
Foreign bonds
     
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Gross Unrealized Gain 86 82  
Foreign bonds | Cost
     
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost 310 303  
Foreign bonds | Fair Value
     
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Estimated Fair Value 396 385  
Other Debt Securities
     
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Gross Unrealized Loss (15) (17)  
Other Debt Securities | Cost
     
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost 64 73  
Other Debt Securities | Fair Value
     
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Estimated Fair Value 49 56  
Equity securities:
     
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Gross Unrealized Gain 6 9  
Equity securities: | Cost
     
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost 305 450  
Equity securities: | Fair Value
     
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Estimated Fair Value 311 459  
Mutual funds | Cost
     
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost 300 400  
Mutual funds | Fair Value
     
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Estimated Fair Value 300 400  
Equity securities in public companies
     
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Gross Unrealized Gain 6 9  
Equity securities in public companies | Cost
     
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Cost 5 50  
Equity securities in public companies | Fair Value
     
Cash equivalents and available-for-sale investments      
Available-for-sale securities, Estimated Fair Value 11 59  
Time deposits | Cost
     
Cash equivalents and available-for-sale investments      
Cash equivalents 2,207 3,633  
Time deposits | Fair Value
     
Cash equivalents and available-for-sale investments      
Cash equivalents 2,207 3,633  
Money market funds | Cost
     
Cash equivalents and available-for-sale investments      
Cash equivalents 6,819 4,630  
Money market funds | Fair Value
     
Cash equivalents and available-for-sale investments      
Cash equivalents 6,819 4,630  
Mutual funds | Cost
     
Cash equivalents and available-for-sale investments      
Cash equivalents 13 69  
Mutual funds | Fair Value
     
Cash equivalents and available-for-sale investments      
Cash equivalents $ 13 $ 69