Comprehensive Income (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 29, 2012		Jul. 31, 2011		Aug. 01, 2010
Comprehensive Income [Abstract]
Total comprehensive income	$ 415		$ 1,111		$ 826
Foreign currency translation adjustments, net of tax	261	[1]	396	[1]
Cash-flow hedges, net of tax	(10)	[2]	(20)	[2]
Net actuarial loss, net of tax	(1,034)	[3]	(809)	[3]
Prior service credit, net of tax	7	[3]	6	[3]
Total Accumulated other comprehensive loss	(776)		(427)
Foreign currency translation tax expense	12		4
Cash flow hedges tax benefit	6		11
Unamortized pension and postretirement, tax benefit	$ 581		$ 459

[1] Included a tax expense of $12 as of 2012, and $4 as of 2011. The amount related to noncontrolling interests was not material.

[2] Included a tax benefit of $6 as of 2012, and $11 as of 2011.

[3] Included a tax benefit of $581 as of 2012, and $459 as of 2011.