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Goodwill and Purchased Intangible Assets (Details 3) (USD $)
In Millions, unless otherwise specified
Jul. 31, 2013
Estimated future amortization expense related to finite-lived purchased intangible assets  
2013 (remaining three months) $ 315
2014 1,028
2015 838
2016 682
2017 256
2018 145
Thereafter 218
Amortizable purchased intangible assets, net $ 3,482