Income Taxes (Provision For Income Taxes) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 26, 2014	Jul. 27, 2013	Jul. 28, 2012
Federal:
Current	$ 1,672	$ 601	$ 1,836
Deferred	(383)	152	(270)
Total	1,289	753	1,566
State:
Current	176	81	119
Deferred	(64)	48	(53)
Total	112	129	66
Foreign:
Current	692	599	477
Deferred	(231)	(237)	9
Total	461	362	486
Total	$ 1,862	$ 1,244	$ 2,118