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Discontinued Operations (Tables)
6 Months Ended
Oct. 26, 2012
Discontinued Operations and Disposal Groups [Abstract]  
Summary of Operating Results for Discontinued Operations before Tax
 Three months ended Six months ended
 October 28, October 28,
(in millions)2011 2011
Discontinued operations:     
Net sales$ 109 $ 211
      
Earnings from operations of Physio-Control$ 17 $ 25
Physio-Control divestiture-related costs  (7)   (12)
Income tax expense  (3)   (4)
Earnings from discontinued operations$ 7 $ 9