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Stock-based Compensation Summary of Stock-based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 28, 2019
Apr. 29, 2018
Apr. 28, 2019
Apr. 29, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Total pre-tax stock-based compensation expense $ 13 $ 16 $ 43 $ 46
Tax-related benefits $ 2 $ 3 $ 8 $ 10