Income Taxes (Aggregate Changes In Gross Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 26, 2014	Jul. 27, 2013	Jul. 28, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 1,775	$ 2,819	$ 2,948
Additions based on tax positions related to the current year	262	138	155
Additions for tax positions of prior years	64	187	54
Reductions for tax positions of prior years	(13)	(1,027)	(226)
Settlements	(17)	(199)	(41)
Lapse of statute of limitations	(133)	(143)	(71)
Ending balance	$ 1,938	$ 1,775	$ 2,819