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Business Combinations Purchase Price Allocation (Details) - USD ($)
$ in Millions
Jul. 29, 2018
Oct. 29, 2017
Jul. 30, 2017
Business Acquisition [Line Items]      
Goodwill $ 3,368 $ 3,368  
2017 Acquisitions      
Business Acquisition [Line Items]      
Fair value of net assets acquired     $ 17
Goodwill     44
Purchased technology     31
Purchase price allocated     $ 92