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Goodwill and Purchased Intangible Assets (Schedule of Amortization of Purchased Intangible Assets) (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 28, 2018
Jul. 29, 2017
Jul. 30, 2016
Acquired Intangible Asset Amortization by Statement of Operations Class [Line Items]      
Amortization of purchased intangible assets $ 221 $ 259 $ 303
Cost of sales      
Acquired Intangible Asset Amortization by Statement of Operations Class [Line Items]      
Amortization of purchased intangible assets 640 556 577
Amortization of purchased intangible assets      
Acquired Intangible Asset Amortization by Statement of Operations Class [Line Items]      
Amortization of purchased intangible assets 221 259 303
Restructuring and other charges      
Acquired Intangible Asset Amortization by Statement of Operations Class [Line Items]      
Amortization of purchased intangible assets 0 38 0
Total      
Acquired Intangible Asset Amortization by Statement of Operations Class [Line Items]      
Amortization of purchased intangible assets $ 861 $ 853 $ 880