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Financing Arrangements (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Jul. 27, 2012
Apr. 27, 2012
General Disclosures    
Long-term debt $ 7,386 $ 7,359
Warrants exercise price (per unit) 76.56  
Common stock settled for warrants (in shares) 41  
Common stock settled for warrants in future (in shares) 41  
Warrants expired (in shares) 41  
Line of Credit Facility    
Short-term borrowings 3,391 3,274
2011 Senior Convertible Notes
   
General Disclosures    
Principal amount 2,200  
Stated interest rate 1.50%  
2013 Senior Convertible Notes
   
General Disclosures    
Long-term debt 2,133 2,110
Principal amount 2,200 2,200
Stated interest rate 1.625%  
Senior Notes 2005 Due 2015
   
General Disclosures    
Principal amount 600  
Stated interest rate 4.75%  
Senior Notes 2009 Due 2014
   
General Disclosures    
Principal amount 550  
Stated interest rate 4.50%  
Senior Notes 2009 Due 2019
   
General Disclosures    
Principal amount 400  
Stated interest rate 5.60%  
Senior Notes 2009 Due 2039
   
General Disclosures    
Principal amount 300  
Stated interest rate 6.50%  
Senior Notes 2010 Due 2015
   
General Disclosures    
Principal amount 1,250  
Stated interest rate 3.00%  
Senior Notes 2010 Due 2020
   
General Disclosures    
Principal amount 1,250  
Stated interest rate 4.45%  
Senior Notes 2010 Due 2040
   
General Disclosures    
Principal amount 500  
Stated interest rate 5.55%  
Senior Notes 2011 Due 2016
   
General Disclosures    
Principal amount 500  
Stated interest rate 2.625%  
Senior Notes 2011 Due 2021
   
General Disclosures    
Principal amount 500  
Stated interest rate 4.125%  
Senior Notes 2012 Due 2022
   
General Disclosures    
Principal amount 675  
Stated interest rate 3.125%  
Senior Notes 2012 Due 2042
   
General Disclosures    
Principal amount 400  
Stated interest rate 4.50%  
Commercial Paper
   
Line of Credit Facility    
Short-term borrowings 1,000 950
Maximum credit available 2,250  
Maximum maturities (in days) 364 days  
Weighted average original maturity (in days) 61 days  
Short-term debt, weighted average interest rate 0.15%  
Credit Facility
   
Line of Credit Facility    
Maximum credit available 2,250  
Additional borrowing capacity $ 500