Net Income per Share (Calculation Of Basic And Diluted Net Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jul. 30, 2016	Jul. 25, 2015	Jul. 26, 2014
Earnings Per Share [Abstract]
Net income	$ 10,739	$ 8,981	$ 7,853
Weighted-average shares—basic (In shares)	5,053	5,104	5,234
Effect of dilutive potential common shares (in shares)	35	42	47
Weighted-average shares—diluted (in shares)	5,088	5,146	5,281
Net income per share—basic	$ 2.13	$ 1.76	$ 1.50
Net income per share—diluted	$ 2.11	$ 1.75	$ 1.49
Antidilutive employee share-based awards, excluded (in shares)	148	183	254