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Goodwill and Purchased Intangible Assets (Schedule Of Estimated Future Amortization Expense Of Purchased Intangible Assets) (Details) (USD $)
In Millions, unless otherwise specified
Oct. 25, 2014
Jul. 26, 2014
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]    
2015 (remaining nine months) $ 728  
2016 754  
2017 580  
2018 421  
2019 315  
Thereafter 146  
Total $ 2,944 $ 3,148