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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
Jul. 26, 2014
Jul. 27, 2013
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]    
2015 $ 979  
2016 743  
2017 567  
2018 407  
2019 307  
Thereafter 145  
Net $ 3,148 $ 3,317