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Goodwill and Purchased Intangible Assets (Schedule Of Estimated Future Amortization Expense Of Purchased Intangible Assets) (Details) - USD ($)
$ in Millions
Jul. 25, 2015
Jul. 26, 2014
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]    
2016 $ 770  
2017 596  
2018 453  
2019 357  
2020 140  
Thereafter 43  
Total $ 2,359 $ 3,148