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Financing Arrangements (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Oct. 26, 2012
Oct. 26, 2012
Apr. 27, 2012
General Disclosures      
Long-term debt $ 7,355 $ 7,355 $ 7,359
Warrants exercise price (per unit) 76.56 76.56  
Common stock settled for warrants (in shares) 41 41  
Common stock settled for warrants in future (in shares) 41 41  
Warrants expired (in shares) 41 41  
Line of Credit Facility      
Short-term borrowings 4,097 4,097 3,274
2011 Senior Convertible Notes
     
General Disclosures      
Principal amount 2,200 2,200  
Stated interest rate 1.50% 1.50%  
2013 Senior Convertible Notes
     
General Disclosures      
Long-term debt 2,156 2,156 2,110
Principal amount 2,200 2,200 2,200
Stated interest rate 1.625% 1.625%  
Senior Notes 2005 Due 2015
     
General Disclosures      
Principal amount 600 600  
Stated interest rate 4.75% 4.75%  
Senior Notes 2009 Due 2014
     
General Disclosures      
Principal amount 550 550  
Stated interest rate 4.50% 4.50%  
Senior Notes 2009 Due 2019
     
General Disclosures      
Principal amount 400 400  
Stated interest rate 5.60% 5.60%  
Senior Notes 2009 Due 2039
     
General Disclosures      
Principal amount 300 300  
Stated interest rate 6.50% 6.50%  
Senior Notes 2010 Due 2015
     
General Disclosures      
Principal amount 1,250 1,250  
Stated interest rate 3.00% 3.00%  
Senior Notes 2010 Due 2020
     
General Disclosures      
Principal amount 1,250 1,250  
Stated interest rate 4.45% 4.45%  
Senior Notes 2010 Due 2040
     
General Disclosures      
Principal amount 500 500  
Stated interest rate 5.55% 5.55%  
Senior Notes 2011 Due 2016
     
General Disclosures      
Principal amount 500 500  
Stated interest rate 2.625% 2.625%  
Senior Notes 2011 Due 2021
     
General Disclosures      
Principal amount 500 500  
Stated interest rate 4.125% 4.125%  
Senior Notes 2012 Due 2022
     
General Disclosures      
Principal amount 675 675  
Stated interest rate 3.125% 3.125%  
Senior Notes 2012 Due 2042
     
General Disclosures      
Principal amount 400 400  
Stated interest rate 4.50% 4.50%  
Commercial Paper
     
Line of Credit Facility      
Short-term borrowings 1,650 1,650 950
Maximum credit available 2,250 2,250  
Maximum maturities   364 days  
Weighted average original maturity 87 days 74 days  
Weighted average interest rate 0.18% 0.16%  
Credit Facility
     
Line of Credit Facility      
Maximum credit available 2,250 2,250  
Additional borrowing capacity $ 500 $ 500