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Goodwill and Purchased Intangible Assets (Details 3) (USD $)
In Millions, unless otherwise specified
Jan. 31, 2013
Estimated future amortization expense related to finite-lived purchased intangible assets  
2013 (remaining 9 months) $ 1,014
2014 1,029
2015 840
2016 684
2017 257
2018 145
Thereafter 209
Amortizable purchased intangible assets, net $ 4,178