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Financial Instruments (Details) - USD ($)
$ in Millions
Jul. 31, 2016
Oct. 31, 2015
Cash equivalents and available-for-sale investments    
Gross Unrealized Gain $ 80 $ 76
Gross Unrealized Loss (12) (22)
Debt securities:    
Cash equivalents and available-for-sale investments    
Gross Unrealized Gain 76 69
Gross Unrealized Loss (12) (13)
Foreign bonds    
Cash equivalents and available-for-sale investments    
Gross Unrealized Gain 76 69
Other debt securities    
Cash equivalents and available-for-sale investments    
Gross Unrealized Loss (12) (13)
Equity securities in public companies    
Cash equivalents and available-for-sale investments    
Gross Unrealized Gain 4 7
Gross Unrealized Loss 0 (9)
Equity securities in public companies    
Cash equivalents and available-for-sale investments    
Gross Unrealized Gain 4 7
Gross Unrealized Loss 0 (9)
Cost    
Cash equivalents and available-for-sale investments    
Cash Equivalents: 8,623 7,132
Available-for-sale securities, Cost 303 531
Total cash equivalents and available-for-sale investments 8,926 7,663
Cost | Debt securities:    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Cost 282 403
Cost | Time deposits    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Cost 13 106
Cost | Foreign bonds    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Cost 221 244
Cost | Other debt securities    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Cost 48 53
Cost | Equity securities in public companies    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Cost 21 128
Cost | Mutual funds    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Cost 0 73
Cost | Equity securities in public companies    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Cost 21 55
Cost | Time deposits    
Cash equivalents and available-for-sale investments    
Cash Equivalents: 3,640 2,367
Cost | Money market funds    
Cash equivalents and available-for-sale investments    
Cash Equivalents: 4,983 4,592
Cost | Mutual funds    
Cash equivalents and available-for-sale investments    
Cash Equivalents: 0 173
Fair Value    
Cash equivalents and available-for-sale investments    
Cash Equivalents: 8,623 7,132
Available-for-sale securities, Estimated Fair Value 371 585
Total cash equivalents and available-for-sale investments 8,994 7,717
Fair Value | Debt securities:    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Estimated Fair Value 346 459
Fair Value | Time deposits    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Estimated Fair Value 13 106
Fair Value | Foreign bonds    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Estimated Fair Value 297 313
Fair Value | Other debt securities    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Estimated Fair Value 36 40
Fair Value | Equity securities in public companies    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Estimated Fair Value 25 126
Fair Value | Mutual funds    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Estimated Fair Value 0 73
Fair Value | Equity securities in public companies    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Estimated Fair Value 25 53
Fair Value | Time deposits    
Cash equivalents and available-for-sale investments    
Cash Equivalents: 3,640 2,367
Fair Value | Money market funds    
Cash equivalents and available-for-sale investments    
Cash Equivalents: 4,983 4,592
Fair Value | Mutual funds    
Cash equivalents and available-for-sale investments    
Cash Equivalents: 0 $ 173
MphasiS | Cost | Time deposits    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Cost 40  
MphasiS | Cost | Foreign bonds    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Cost 38  
MphasiS | Cost | Mutual funds    
Cash equivalents and available-for-sale investments    
Available-for-sale securities, Cost 91  
MphasiS | Cost | Time deposits    
Cash equivalents and available-for-sale investments    
Cash Equivalents: 33  
MphasiS | Cost | Mutual funds    
Cash equivalents and available-for-sale investments    
Cash Equivalents: $ 223