Restructuring Charges (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended					3 Months Ended	12 Months Ended																	3 Months Ended	12 Months Ended		36 Months Ended							12 Months Ended	36 Months Ended	1 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended
	Jul. 31, 2011	Aug. 01, 2010	Jul. 31, 2011 Australia [Member] 2011 Initiatives [Member]	Jul. 31, 2011 Camden, New Jersey [Member] 2011 Initiatives [Member] Salaried Workforce [Member]	Jul. 31, 2011 Moscow [Member] 2011 Initiatives [Member]	Jul. 31, 2011 2011 Initiatives [Member]	Jul. 31, 2011 2011 Initiatives [Member]	Jul. 31, 2011 2011 Initiatives [Member] U.S. Simple Meals [Member]	Jul. 31, 2011 2011 Initiatives [Member] U.S. Simple Meals [Member] Other Exit Costs [Member]	Jul. 31, 2011 2011 Initiatives [Member] U.S. Beverages [Member]	Jul. 31, 2011 2011 Initiatives [Member] U.S. Beverages [Member] Other Exit Costs [Member]	Jul. 31, 2011 2011 Initiatives [Member] Global Baking And Snacking [Member]	Jul. 31, 2011 2011 Initiatives [Member] Global Baking And Snacking [Member] Other Exit Costs [Member]	Jul. 31, 2011 2011 Initiatives [Member] International Simple Meals And Beverages [Member]	Jul. 31, 2011 2011 Initiatives [Member] International Simple Meals And Beverages [Member] Other Exit Costs [Member]	Jul. 31, 2011 2011 Initiatives [Member] North America Foodservice [Member]	Jul. 31, 2011 2011 Initiatives [Member] North America Foodservice [Member] Other Exit Costs [Member]	Jul. 31, 2011 2011 Initiatives [Member] Corporate [Member]	Jul. 31, 2011 2011 Initiatives [Member] Corporate [Member] Other Exit Costs [Member]	Jul. 31, 2011 2011 Initiatives [Member] Other Exit Costs [Member]	Jul. 31, 2011 2011 Initiatives [Member] Salaried Workforce [Member]	Jul. 31, 2011 2011 Initiatives [Member] Outsource Of U.S. Retail Merchandising [Member]	Jul. 31, 2011 2011 Initiatives [Member] Total Program [Member]	May 02, 2010 2008 Initiatives [Member]	Aug. 01, 2010 2008 Initiatives [Member]	Aug. 02, 2009 2008 Initiatives [Member]	Aug. 01, 2010 2008 Initiatives [Member]	Aug. 01, 2010 2008 Initiatives [Member] Global Baking And Snacking [Member]	Aug. 01, 2010 2008 Initiatives [Member] Global Baking And Snacking [Member] Other Exit Costs [Member]	Aug. 01, 2010 2008 Initiatives [Member] International Simple Meals And Beverages [Member]	Aug. 01, 2010 2008 Initiatives [Member] International Simple Meals And Beverages [Member] Other Exit Costs [Member]	Aug. 01, 2010 2008 Initiatives [Member] North America Foodservice [Member]	Aug. 01, 2010 2008 Initiatives [Member] North America Foodservice [Member] Other Exit Costs [Member]	Aug. 03, 2008 2008 Initiatives [Member] Other Exit Costs [Member]	Aug. 01, 2010 2008 Initiatives [Member] Other Exit Costs [Member]	Apr. 30, 2008 2008 Initiatives [Member] Canadian Initiatives [Member]	Aug. 01, 2010 2008 Initiatives [Member] Canadian Initiatives [Member]	Aug. 02, 2009 2008 Initiatives [Member] Canadian Initiatives [Member]	Feb. 01, 2009 2008 Initiatives [Member] Miranda Initiatives [Member]	Aug. 02, 2009 2008 Initiatives [Member] Miranda Initiatives [Member]	Aug. 03, 2008 2008 Initiatives [Member] Total Program [Member]	Aug. 03, 2008 Sale Of Certain Australian Salty Snack Food Brands And Assets [Member]
Positions expected to be eliminated			190	130	50		750														510	190														500			150
Restructuring charges	$ 63	$ 12					$ 63																		$ 12	$ 22											$ 12
Restructuring charges, after tax						41	41																	8	8	15											8
Restructuring Charges Per Diluted Share						$ 0.12	$ 0.12																	$ 0.02	$ 0.02	$ 0.04
Aggregate pre-tax costs expected							12	2				3		6				1		10			75											10							230
Expected cash expenditures							50
Expected cash expenditures																											40
Aggregate pre-tax costs incurred							63	31	1	3		12		12		1		4	3	4							216	147	2	9		60	2		4
Cash expenditures							2
Expected investment to capital expenditures							40
Accelerated depreciation on property, plant and equipment																										17												16		1
Accelerated depreciation on property, plant and equipment, after tax																										12												11
Other exit costs																										4												2		2
Other exit costs, after tax																										2												1		1
Employee severance and benefit costs																										$ 1												$ 1				$ 17