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Business And Geographic Segment Information (Additional Product Information For Net Sales) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Oct. 28, 2012
Oct. 30, 2011
Segment Reporting Information [Line Items]    
Net sales $ 2,336 $ 2,161
Simple Meals [Member]
   
Segment Reporting Information [Line Items]    
Net sales 1,422 1,310
Baked Snacks [Member]
   
Segment Reporting Information [Line Items]    
Net sales 612 602
Beverages [Member]
   
Segment Reporting Information [Line Items]    
Net sales $ 302 $ 249