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Goodwill and Purchased Intangible Assets (Details 3) (USD $)
In Millions, unless otherwise specified
Apr. 30, 2013
Estimated future amortization expense related to finite-lived purchased intangible assets  
2013 (remaining 6 months) $ 667
2014 1,035
2015 845
2016 688
2017 262
2018 150
Thereafter 219
Amortizable purchased intangible assets, net $ 3,866