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Goodwill and Purchased Intangible Assets (Schedule of Estimated Future Amortization Expense of Purchased Intangible Assets) (Details) - USD ($)
$ in Millions
Apr. 28, 2018
Jul. 29, 2017
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]    
2018 (remaining three months) $ 235  
2019 883  
2020 665  
2021 463  
2022 212  
Thereafter 119  
Total purchased intangible assets with finite lives, net $ 2,577 $ 2,428