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Goodwill and Other Intangible Assets, Net (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Oct. 25, 2013
Oct. 26, 2012
Oct. 25, 2013
Oct. 26, 2012
Apr. 26, 2013
The changes in the carrying amount of goodwill          
Beginning balance     $ 10,329    
Goodwill as a result of acquisitions     123    
Currency adjustments, net     12    
Ending balance 10,464   10,464    
Balance of intangible assets, excluding goodwill          
Finite-Lived And Indefinite-Lived Intangible Assets, Gross 4,844   4,844   4,771
Accumulated amortization (2,236)   (2,236)   (2,098)
Carrying value 2,283   2,283    
Intangible Assets, Net (Excluding Goodwill) 2,608   2,608   2,673
Amortization expense 88 79 174 159  
Estimated aggregate amortization expense          
Remaining 2014 174   174    
2015 336   336    
2016 324   324    
2017 302   302    
2018 286   286    
2019 240   240    
Thereafter 621   621    
Purchased Technology and Patents
         
Balance of intangible assets, excluding goodwill          
Original cost 3,921   3,921   3,896
Accumulated amortization (1,825)   (1,825)   (1,702)
Carrying value 2,096   2,096   2,194
Trademarks and Tradenames
         
Balance of intangible assets, excluding goodwill          
Original cost 408   408   408
Accumulated amortization (327)   (327)   (320)
Carrying value 81   81   88
Other
         
Balance of intangible assets, excluding goodwill          
Original cost 190   190   104
Accumulated amortization (84)   (84)   (76)
Carrying value 106   106   28
Cardiac and Vascular Group
         
The changes in the carrying amount of goodwill          
Beginning balance     2,624    
Goodwill as a result of acquisitions     123    
Currency adjustments, net     1    
Ending balance 2,748   2,748    
Restorative Therapies Group
         
The changes in the carrying amount of goodwill          
Beginning balance     6,361    
Goodwill as a result of acquisitions     0    
Currency adjustments, net     11    
Ending balance 6,372   6,372    
Diabetes Group [Member]
         
The changes in the carrying amount of goodwill          
Beginning balance     1,344    
Goodwill as a result of acquisitions     0    
Currency adjustments, net     0    
Ending balance 1,344   1,344    
Acquired in Process Research and Development [Member]
         
Balance of intangible assets, excluding goodwill          
Indefinite-Lived Intangible Assets (Excluding Goodwill) $ 325   $ 325   $ 363