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Restructuring and Other Charges (Additional Information) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended
Oct. 25, 2014
Oct. 25, 2014
Fiscal 2015 plan
Oct. 25, 2014
Fiscal 2015 plan
Expected Maximum
Oct. 26, 2013
Fiscal 2014 Plan
Jul. 26, 2014
Fiscal 2014 Plan
Restructuring Cost and Reserve [Line Items]          
Restructuring Charges $ 318     $ 237  
Cumulative restructuring charges   318     418
Restructuring and Related Cost, Expected Cost     $ 600