Restructuring Charges (Schedule Of Restructuring Activity And Related Reserves) (Details) (USD $) In Millions	12 Months Ended
	Jul. 31, 2011	Aug. 01, 2010		Aug. 02, 2009		Aug. 03, 2008
Listowel, Canada And Miranda, Australia [Member]
Severance, asset impairment, and accelerated depreciation						$ 45
2011 Initiatives [Member]
Accrued beginning balance
Charges	63
Cash payments	(2)
Accrued ending balance	39
2011 Initiatives [Member] | Severance Pay And Benefits [Member]
Accrued beginning balance
Charges	37
Cash payments	(2)
Accrued ending balance	35
2011 Initiatives [Member] | Asset Impairment/Accelerated Depreciation [Member]
Accrued beginning balance
Charges	22
2011 Initiatives [Member] | Other Exit Costs [Member]
Accrued beginning balance
Charges	4
Accrued ending balance	4
2008 Initiatives [Member]
Charges		12		22		182	[1]
Employee severance and benefit costs				1
2008 Initiatives [Member] | Severance Pay And Benefits [Member]
Accrued beginning balance	1	4		37
Charges		12		1		45	[1]
Cash payments	(1)	(3)		(26)		(4)
Pension termination benefits		(12)	[2]	(2)	[2]	(4)	[2]
Foreign currency translation adjustment				(6)
Accrued ending balance		1		4		37
2008 Initiatives [Member] | Asset Impairment/Accelerated Depreciation [Member]
Charges				17		137	[1]
2008 Initiatives [Member] | Other Exit Costs [Member]
Charges				4
Sale Of Certain Australian Salty Snack Food Brands And Assets [Member]
Pre-tax loss on sale						120
Employee severance and benefit costs						$ 17

[1] In 2008, as part of the initiatives, the company sold certain Australian salty snack food brands and assets, which were part of Global Baking and Snacking, and recorded a pre-tax net loss of $120 on the sale. The company streamlined its management structure and eliminated certain overhead costs. These actions began in the fourth quarter of 2008 and were substantially completed in 2009. In connection with this action, the company recorded $17 in employee severance and benefit costs in 2008. The company also recognized $45 in costs associated with the closures of the Listowel, Canada, and Miranda, Australia, facilities.

[2] (2) Pension termination benefits are recognized in Other Liabilities and Accumulated Other Compensation Income/(Loss). See Note 11.