Goodwill and Purchased Intangible Assets (Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 24, 2015	Oct. 25, 2014
Finite-Lived Intangible Assets [Line Items]
Impairment	$ 0	$ 0
Cost of Goods Sold	$ 3,853	3,919
Rockstar Consortium
Finite-Lived Intangible Assets [Line Items]
Settlement of Patent Infringement Claims (Include capitalized and expensed portion)		300
Cost of Goods Sold		$ 188