Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended	1 Months Ended	3 Months Ended	0 Months Ended
	Oct. 24, 2014	Oct. 25, 2013	Oct. 24, 2014	Oct. 25, 2013	Apr. 25, 2014 INFUSE Product Liability Litigation	May 31, 2012 Shareholder Related Matters Lawsuits	Oct. 24, 2014 Other Matters [Member]	Nov. 24, 2014 Subsequent Event [Member] INFUSE Product Liability Litigation PersonalInjuryCases Lawsuits claim	Nov. 24, 2014 Subsequent Event [Member] INFUSE Product Liability Litigation Lawsuits claim
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number									800
Loss Contingency, Number of Plaintiffs								1,300
Loss Contingency, Estimate Of Unfiled Claims, Number									3,500
Settlement
Certain litigation charges, net	$ 0	$ 24	$ 0	$ 24	$ 140		$ 3
New claims filed, number						2
Payments for Legal Settlements			$ 800	$ 3