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Financial Instruments (Details) - USD ($)
$ in Millions
Jul. 31, 2015
Oct. 31, 2014
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Gross Unrealized Gain $ 87 $ 97
Available-for-sale securities, Gross Unrealized Loss (13) (14)
Cost    
Cash equivalents and available-for-sale investments    
Cash equivalents 13,219 12,687
Available-for-sale securities, Cost 557 634
Total cash equivalents and available-for-sale investments 13,776 13,321
Fair Value    
Cash equivalents and available-for-sale investments    
Cash equivalents 13,219 12,687
Available-for-sale securities, Estimated Fair Value 631 717
Total cash equivalents and available-for-sale investments 13,850 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)
Debt securities: | Cost    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Cost 459 492
Debt securities: | Fair Value    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Estimated Fair Value 525 568
Time deposits | Cost    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Cost 153 145
Time deposits | Fair Value    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Estimated Fair Value 153 145
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 251 286
Foreign bonds | Fair Value    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Estimated Fair Value 330 376
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 8 7
Marketable equity securities | Cost    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Cost 98 142
Marketable equity securities | Fair Value    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Estimated Fair Value 106 149
Mutual funds | Cost    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Cost 39 134
Mutual funds | Fair Value    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Estimated Fair Value 39 134
Equity securities in public companies    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Gross Unrealized Gain 8 7
Equity securities in public companies | Cost    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Cost 59 8
Equity securities in public companies | Fair Value    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Estimated Fair Value 67 15
Time deposits | Cost    
Cash equivalents and available-for-sale investments    
Cash equivalents 3,043 2,720
Time deposits | Fair Value    
Cash equivalents and available-for-sale investments    
Cash equivalents 3,043 2,720
Money market funds | Cost    
Cash equivalents and available-for-sale investments    
Cash equivalents 9,926 9,857
Money market funds | Fair Value    
Cash equivalents and available-for-sale investments    
Cash equivalents 9,926 9,857
Mutual funds | Cost    
Cash equivalents and available-for-sale investments    
Cash equivalents 250 110
Mutual funds | Fair Value    
Cash equivalents and available-for-sale investments    
Cash equivalents $ 250 $ 110