Restructuring Charges (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended			9 Months Ended		10 Months Ended
	Apr. 29, 2012	Jul. 31, 2011	May 01, 2011	Apr. 29, 2012	May 01, 2011	Apr. 29, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 4	$ 63	$ 0	$ 9	$ 0
Restructuring charges, after tax	3	41		6
Restructuring charges per diluted share	$ 0.01	$ 0.12		$ 0.02
Aggregate pre-tax costs expected						75
Expected cash expenditures	50
Expected investment in capital expenditures	40
Aggregate pre-tax costs expected to be incurred						3
U.S. Simple Meals [Member]
Restructuring Cost and Reserve [Line Items]
Aggregate pre-tax costs expected	1
Global Baking And Snacking [Member]
Restructuring Cost and Reserve [Line Items]
Aggregate pre-tax costs expected	$ 2
Australia
Restructuring Cost and Reserve [Line Items]
Positions expected to be eliminated	190
Salaried Workforce [Member]
Restructuring Cost and Reserve [Line Items]
Positions expected to be eliminated	510
Salaried Workforce [Member] | Camden New Jersey [Member]
Restructuring Cost and Reserve [Line Items]
Positions expected to be eliminated	130
Salaried Workforce [Member] | Outsource Of U.S. Retail Merchandising [Member]
Restructuring Cost and Reserve [Line Items]
Positions expected to be eliminated	190
Moscow [Member]
Restructuring Cost and Reserve [Line Items]
Positions eliminated	50