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Financing Arrangements (Tables)
 6 Months Ended
Oct. 28, 2011
Debt Disclosure [Abstract]  
Equity and debt information for Senior Convertible Notes under the convertible debt guidance
 2013 Senior Convertible Notes       
(in millions)October 28,  April 29,       
2011 2011       
Carrying amount of the equity component$547 $547       
             
Principal amount of the 2013 Senior Convertible Notes$ 2,200 $ 2,200       
Unamortized discount  (134)   (177)       
Net carrying amount$ 2,066 $ 2,023       
             
Interest rate and interest expense amounts related to Senior Convertible Notes
 2011 Senior Convertible Notes 2013 Senior Convertible Notes 
 Three months ended Three months ended 
(in millions, except interest rate)October 28,  October 29,  October 28,  October 29,  
2011 20102011 2010 
Effective interest rate  -%  5.97%  6.03%  6.03%
Interest cost related to contractual interest coupon$ - $8 $9 $9 
Interest cost related to amortization of the discount$ - $23 $21 $20 
             
 2011 Senior Convertible Notes 2013 Senior Convertible Notes 
 Six months ended Six months ended 
(in millions, except interest rate)October 28,  October 29,  October 28,  October 29,  
2011 20102011 2010 
Effective interest rate  -%  5.97%  6.03%  6.03%
Interest cost related to contractual interest coupon$ - $16 $18 $18 
Interest cost related to amortization of the discount$ - $46 $43 $40