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Goodwill and Other Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Jul. 27, 2012
Jul. 29, 2011
Apr. 27, 2012
The changes in the carrying amount of goodwill      
Beginning balance $ 9,934    
Goodwill as a result of acquisitions 12    
Purchase accounting adjustments, net 1    
Currency adjustments, net (14)    
Ending balance 9,933    
Balance of intangible assets, excluding goodwill      
Original cost 4,457   4,495
Accumulated amortization (1,898)   (1,848)
Carrying value 2,559   2,647
Amortization expense 80 86  
Estimated aggregate amortization expense      
Remaining 2013 236    
2014 306    
2015 289    
2016 276    
2017 255    
2018 239    
Thereafter 597    
Total estimated amortization expense 2,198    
Purchased Technology and Patents
     
Balance of intangible assets, excluding goodwill      
Original cost 3,574   3,604
Accumulated amortization (1,482)   (1,440)
Carrying value 2,092   2,164
Trademarks and Tradenames
     
Balance of intangible assets, excluding goodwill      
Original cost 374   373
Accumulated amortization (309)   (307)
Carrying value 65   66
Acquired IPR&D
     
Balance of intangible assets, excluding goodwill      
Original cost 361   370
Accumulated amortization 0   0
Carrying value 361   370
Other
     
Balance of intangible assets, excluding goodwill      
Original cost 148   148
Accumulated amortization (107)   (101)
Carrying value 41   47
Cardiac and Vascular Group
     
The changes in the carrying amount of goodwill      
Beginning balance 2,636    
Goodwill as a result of acquisitions 0    
Purchase accounting adjustments, net 0    
Currency adjustments, net (7)    
Ending balance 2,629    
Restorative Therapies Group
     
The changes in the carrying amount of goodwill      
Beginning balance 7,298    
Goodwill as a result of acquisitions 12    
Purchase accounting adjustments, net 1    
Currency adjustments, net (7)    
Ending balance $ 7,304