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Supplemental Financial Statement Data (Schedule Of Balance Sheets - Plant Assets) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jul. 29, 2012
Jul. 31, 2011
Aug. 01, 2010
Land $ 62 $ 64  
Buildings 1,260 1,224  
Machinery and equipment 3,963 3,896  
Projects in progress 198 179  
Total cost 5,483 5,363  
Accumulated depreciation (3,356) [1] (3,260) [1]  
Plant assets 2,127 2,103 2,051
Depreciation expense $ 258 $ 265 $ 251
Buildings [Member]
     
Property, plant and equipment minimum useful life 7    
Property, plant and equipment maximum useful life 45    
Machinery And Equipment [Member]
     
Property, plant and equipment minimum useful life 2    
Property, plant and equipment maximum useful life 20    
[1] Depreciation expense was $258 in 2012, $265 in 2011, and $251 in 2010. Buildings are depreciated over periods ranging from 7 to 45 years. Machinery and equipment are depreciated over periods generally ranging from 2 to 20 years.