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Goodwill and Purchased Intangible Assets (Schedule Of Estimated Future Amortization Expense Of Purchased Intangible Assets) (Details) - USD ($)
$ in Millions
Apr. 29, 2017
Jul. 30, 2016
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]    
2017 (remaining three months) $ 211  
2018 770  
2019 681  
2020 462  
2021 266  
Thereafter 160  
Total purchased intangible assets with finite lives, net $ 2,550 $ 2,279