Net Income per Share (Calculation Of Basic And Diluted Net Income Per Share) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Jul. 26, 2014	Jul. 27, 2013	Jul. 28, 2012
Earnings Per Share [Abstract]
Net income	$ 7,853	$ 9,983	$ 8,041
Weighted-average shares—basic	5,234	5,329	5,370
Effect of dilutive potential common shares	47	51	34
Weighted-average shares—diluted	5,281	5,380	5,404
Net income per share—basic	$ 1.50	$ 1.87	$ 1.50
Net income per share—diluted	$ 1.49	$ 1.86	$ 1.49
Antidilutive employee share-based awards, excluded	254	407	591