Goodwill and Purchased Intangible Assets (Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Apr. 30, 2016	Apr. 25, 2015	Oct. 25, 2014	Apr. 30, 2016	Apr. 25, 2015	Jul. 25, 2015
Finite-Lived Intangible Assets [Line Items]
Impairment	$ 7	$ 1		$ 44	$ 57
Cost of Goods Sold	$ 3,214	$ 3,584		$ 10,547	$ 11,309
Rockstar Consortium
Finite-Lived Intangible Assets [Line Items]
Settlement of Patent Infringement Claims (Include capitalized and expensed portion)						$ 300
Cost of Goods Sold			$ 188