Net Income per Share (Calculation Of Basic And Diluted Net Income Per Share) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Jul. 27, 2013	Jul. 28, 2012	Jul. 30, 2011
Net Income Per Share [Abstract]
Net income	$ 9,983	$ 8,041	$ 6,490
Weighted-average shares-basic (in shares)	5,329	5,370	5,529
Effect of dilutive potential common shares (in shares)	51	34	34
Weighted-average shares-diluted (in shares)	5,380	5,404	5,563
Net income per share-basic (in dollars per share)	$ 1.87	$ 1.50	$ 1.17
Net income per share-diluted (in dollars per share)	$ 1.86	$ 1.49	$ 1.17
Antidilutive employee share-based awards, excluded, (in shares)	407	591	379