Income Taxes (Aggregate Changes In Gross Unrecognized Tax Benefits) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 27, 2013	Jul. 28, 2012	Jul. 30, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 2,819	$ 2,948	$ 2,677
Additions based on tax positions related to the current year	138	155	374
Additions for tax positions of prior years	187	54	93
Reductions for tax positions of prior years	(1,027)	(226)	(60)
Settlements	(199)	(41)	(56)
Lapse of statute of limitations	(143)	(71)	(80)
Ending balance	$ 1,775	$ 2,819	$ 2,948