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Commitments and Contingencies (Schedule of Other Commitments) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 26, 2019
Jan. 27, 2018
Jan. 26, 2019
Jan. 27, 2018
Acquisition        
Contingency [Line Items]        
Compensation expense related to acquisitions $ 66 $ 46 $ 175 $ 88