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Goodwill and Purchased Intangible Assets (Details 2) (USD $)
In Millions
Apr. 30, 2011
Oct. 31, 2010
Purchased intangible assets    
Amortizable purchased intangible assets, gross $ 13,806 $ 13,612
Amortizable purchased intangible assets, accumulated amortization (8,325) (7,487)
Amortizable purchased intangible assets, net 5,481 6,125
Purchased intangible assets, gross 15,405 15,335
Purchased intangible assets, net 7,080 7,848
Customer contracts, customer lists and distribution agreements
   
Purchased intangible assets    
Amortizable purchased intangible assets, gross 7,521 7,503
Amortizable purchased intangible assets, accumulated amortization (4,317) (3,864)
Amortizable purchased intangible assets, net 3,204 3,639
Developed and core technology and patents
   
Purchased intangible assets    
Amortizable purchased intangible assets, gross 5,938 5,763
Amortizable purchased intangible assets, accumulated amortization (3,751) (3,384)
Amortizable purchased intangible assets, net 2,187 2,379
Product trademarks
   
Purchased intangible assets    
Amortizable purchased intangible assets, gross 347 346
Amortizable purchased intangible assets, accumulated amortization (257) (239)
Amortizable purchased intangible assets, net 90 107
In-process research and development
   
Purchased intangible assets    
Indefinite-lived purchased intangible assets 177 301
Compaq trade name
   
Purchased intangible assets    
Indefinite-lived purchased intangible assets, trade names 1,422 1,422
Vertica Systems, Inc.
   
Purchased intangible assets    
Amortizable purchased intangible assets, gross $ 53