Comprehensive Income (Details) (USD $) In Millions	12 Months Ended
	Jul. 31, 2011		Aug. 01, 2010		Aug. 02, 2009
Comprehensive Income
Total comprehensive income	$ 1,111		$ 826		$ 154
Foreign currency translation adjustments, net of tax	396	[1]	132	[1]
Cash-flow hedges, net of tax	(20)	[2]	(18)	[2]
Net actuarial loss	(809)	[3]	(856)	[3]
Prior service credit	6	[3]	6	[3]
Total Accumulated other comprehensive loss	(427)		(736)
Foreign currency translation tax expense	(4)		1
Cash flow hedges tax benefit	11		10
Unamortized pension and postretirement, tax benefit	$ 459		$ 489

[1] Includes a tax expense of $4 in 2011 and a tax benefit of $1 in 2010. The amount related to noncontrolling interests was not material.

[2] Includes a tax benefit of $11 in 2011 and $10 in 2010.

[3] Includes a tax benefit of $459 in 2011 and $489 in 2010.