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Earnings Per Share (Narrative) (Details) - Employee Stock Option [Member] - shares
shares in Millions
12 Months Ended
Jul. 28, 2019
Jul. 29, 2018
Jul. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Stock options not included in the diluted earnings per share calculation as they were antidilutive 2 1  
Maximum [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Stock options not included in the diluted earnings per share calculation as they were antidilutive     1