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Goodwill and Purchased Intangible Assets (Schedule Of Estimated Future Amortization Expense Of Purchased Intangible Assets) (Details) - USD ($)
$ in Millions
Oct. 28, 2017
Jul. 29, 2017
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]    
2018 (remaining nine months) $ 647  
2019 776  
2020 559  
2021 362  
2022 145  
Thereafter 73  
Total purchased intangible assets with finite lives, net $ 2,562 $ 2,428