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Acquisitions and Divestitures (Summary of Allocation of Total Purchase Consideration) (Details)
$ in Millions
6 Months Ended
Jan. 26, 2019
USD ($)
Business Acquisition [Line Items]  
Purchase Consideration $ 2,085
Net Tangible Assets Acquired (Liabilities Assumed) (54)
Purchased Intangible Assets 350
Goodwill 1,789
Duo  
Business Acquisition [Line Items]  
Purchase Consideration 2,025
Net Tangible Assets Acquired (Liabilities Assumed) (57)
Purchased Intangible Assets 342
Goodwill 1,740
Others (two in total)  
Business Acquisition [Line Items]  
Purchase Consideration 60
Net Tangible Assets Acquired (Liabilities Assumed) 3
Purchased Intangible Assets 8
Goodwill $ 49