Net Income Per Share (Calculation Of Basic And Diluted Net Income Per Share) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 26, 2014	Apr. 27, 2013	Apr. 26, 2014	Apr. 27, 2013
Earnings Per Share [Abstract]
Net income	$ 2,181	$ 2,478	$ 5,606	$ 7,713
Weighted Average Shares, Basic (in shares)	5,143	5,329	5,271	5,316
Weighted Average Number Diluted Shares Outstanding Adjustment	37	58	40	45
Weighted-average shares-diluted (in shares)	5,180	5,387	5,311	5,361
Net income per share-basic	$ 0.42	$ 0.47	$ 1.06	$ 1.45
Earnings Per Share, Diluted	$ 0.42	$ 0.46	$ 1.06	$ 1.44
Antidilutive employee share-based awards, excluded	240	245	331	417