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Contingencies (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended
Jul. 25, 2014
Jul. 26, 2013
Jul. 25, 2014
INFUSE Product Liability Litigation
PersonalInjuryCases
claim
Lawsuits
Apr. 25, 2014
INFUSE Product Liability Litigation
May 31, 2012
Shareholder Related Matters
Lawsuits
Jul. 25, 2014
Other Matters [Member]
Loss Contingencies [Line Items]            
Loss Contingency, Pending Claims, Number     750      
Loss Contingency, Number of Plaintiffs     1,200      
Loss Contingency, Estimate Of Unfiled Claims, Number     3,600      
Settlement            
Certain litigation charges, net       $ 140   $ 3
New claims filed, number         2  
Payments for Legal Settlements $ 761 $ 0