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Financing Arrangements (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended
Apr. 30, 2006
Apr. 27, 2012
Apr. 29, 2011
Apr. 27, 2012
Short-term Debt
Apr. 29, 2011
Short-term Debt
Apr. 27, 2012
Long-term Debt
Apr. 29, 2011
Long-term Debt
Apr. 27, 2012
Commercial Paper
Apr. 29, 2011
Commercial Paper
Apr. 27, 2012
Commercial Paper
Short-term Debt
Apr. 29, 2011
Commercial Paper
Short-term Debt
Apr. 27, 2012
Capital Lease Obligations
Apr. 29, 2011
Capital Lease Obligations
Apr. 27, 2012
Capital Lease Obligations
Short-term Debt
Apr. 29, 2011
Capital Lease Obligations
Short-term Debt
Apr. 27, 2012
Capital Lease Obligations
Long-term Debt
Apr. 29, 2011
Capital Lease Obligations
Long-term Debt
Apr. 27, 2012
Bank Borrowings
Apr. 29, 2011
Bank Borrowings
Apr. 27, 2012
Bank Borrowings
Short-term Debt
Apr. 29, 2011
Bank Borrowings
Short-term Debt
Apr. 29, 2011
Bank Borrowings
Long-term Debt
Sep. 15, 2011
Contingent Convertible Debentures
Apr. 27, 2012
Contingent Convertible Debentures
Apr. 29, 2011
Contingent Convertible Debentures
Apr. 29, 2011
Contingent Convertible Debentures
Long-term Debt
Apr. 27, 2012
Senior Convertible Notes
Apr. 30, 2006
Senior Convertible Notes
Apr. 27, 2012
Senior Convertible Notes
Senior Convertible Notes Due 2011
Apr. 29, 2011
Senior Convertible Notes
Senior Convertible Notes Due 2011
Apr. 27, 2012
Senior Convertible Notes
Senior Convertible Notes Due 2013
Apr. 29, 2011
Senior Convertible Notes
Senior Convertible Notes Due 2013
Apr. 27, 2012
Senior Convertible Notes
Senior Convertible Notes Due 2013
Short-term Debt
Apr. 29, 2011
Senior Convertible Notes
Senior Convertible Notes Due 2013
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2005 Due 2015
Apr. 29, 2011
Senior Notes
Senior Notes 2005 Due 2015
Apr. 27, 2012
Senior Notes
Senior Notes 2005 Due 2015
Long-term Debt
Apr. 29, 2011
Senior Notes
Senior Notes 2005 Due 2015
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2009 Due 2014
Apr. 29, 2011
Senior Notes
Senior Notes 2009 Due 2014
Apr. 27, 2012
Senior Notes
Senior Notes 2009 Due 2014
Long-term Debt
Apr. 29, 2011
Senior Notes
Senior Notes 2009 Due 2014
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2009 Due 2019
Apr. 29, 2011
Senior Notes
Senior Notes 2009 Due 2019
Apr. 27, 2012
Senior Notes
Senior Notes 2009 Due 2019
Long-term Debt
Apr. 29, 2011
Senior Notes
Senior Notes 2009 Due 2019
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2009 Due 2039
Apr. 29, 2011
Senior Notes
Senior Notes 2009 Due 2039
Apr. 27, 2012
Senior Notes
Senior Notes 2009 Due 2039
Long-term Debt
Apr. 29, 2011
Senior Notes
Senior Notes 2009 Due 2039
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2010 Due 2015
Apr. 29, 2011
Senior Notes
Senior Notes 2010 Due 2015
Apr. 27, 2012
Senior Notes
Senior Notes 2010 Due 2015
Long-term Debt
Apr. 29, 2011
Senior Notes
Senior Notes 2010 Due 2015
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2010 Due 2020
Apr. 29, 2011
Senior Notes
Senior Notes 2010 Due 2020
Apr. 27, 2012
Senior Notes
Senior Notes 2010 Due 2020
Long-term Debt
Apr. 29, 2011
Senior Notes
Senior Notes 2010 Due 2020
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2010 Due 2040
Apr. 29, 2011
Senior Notes
Senior Notes 2010 Due 2040
Apr. 27, 2012
Senior Notes
Senior Notes 2010 Due 2040
Long-term Debt
Apr. 29, 2011
Senior Notes
Senior Notes 2010 Due 2040
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2011 Due 2016
Apr. 29, 2011
Senior Notes
Senior Notes 2011 Due 2016
Apr. 27, 2012
Senior Notes
Senior Notes 2011 Due 2016
Long-term Debt
Apr. 29, 2011
Senior Notes
Senior Notes 2011 Due 2016
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2011 Due 2021
Apr. 29, 2011
Senior Notes
Senior Notes 2011 Due 2021
Apr. 27, 2012
Senior Notes
Senior Notes 2011 Due 2021
Long-term Debt
Apr. 29, 2011
Senior Notes
Senior Notes 2011 Due 2021
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2012
Apr. 27, 2012
Senior Notes
Senior Notes 2012 Due 2022
Apr. 29, 2011
Senior Notes
Senior Notes 2012 Due 2022
Apr. 27, 2012
Senior Notes
Senior Notes 2012 Due 2022
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2012 Due 2042
Apr. 29, 2011
Senior Notes
Senior Notes 2012 Due 2042
Apr. 27, 2012
Senior Notes
Senior Notes 2012 Due 2042
Long-term Debt
Apr. 27, 2012
Interest Rate Swap
Apr. 29, 2011
Interest Rate Swap
Apr. 27, 2012
Credit Facility
General Disclosures                                                                                                                                                                
Short-term borrowings   $ 3,274 $ 1,723         $ 950 $ 1,500     $ 14 $ 2         $ 200 $ 222                                                                                                                          
Long-term debt   7,359 8,112                 165 32         0 14           15           2,110 2,023     600 600     550 550     400 400     300 300     1,250 1,250     1,250 1,250     500 500     500 500     500 500       675 0   400 0   167 110  
Gains from interest rate swap terminations   102 68                                                                                                                                                          
Debt discount       (90) (1) 0 (177)                                               (90) (177)                                                                                                
Maturity (in fiscal year)                                               2012             2013       2016       2014       2019       2039       2015       2020       2040       2016       2021         2022     2042          
Earliest maturity (in fiscal year)               2012           2012   2013   2012                                                                                                                       2013    
Last maturity (in fiscal year)               2013           2013   2025   2013                                                                                                                       2022    
Average interest rate                   0.14%       3.38% 7.47% 3.57% 6.28%     0.93% 1.25% 5.60%       1.25%             1.63% 1.63%     4.75% 4.75%     4.50% 4.50%     5.60% 5.60%     6.50% 6.50%     3.00% 3.00%     4.45% 4.45%     5.55% 5.55%     2.63% 2.63%     4.13% 4.13%       3.13%     4.50%      
Effective interest rate                     0.22%                                           6.03% 6.03%     4.76% 4.76%     4.50% 4.50%     5.61% 5.61%     6.52% 6.52%     3.00% 3.00%     4.47% 4.47%     5.56% 5.56%     2.72% 2.72%     4.19% 4.19%       3.16%     4.51%      
Principal amount                                                         2,200   2,200 2,200     600       550                       1,250                       500       500       1,075 675     400          
Stated interest rate                                               1.25%         1.50%   1.625%       4.75%       4.50%                       3.00%                       2.625%       4.125%         3.125%     4.50%          
Conversion price (per share)                                             $ 61.81       $ 53.13 $ 56.14                                                                                                        
Conversion rate                                             100.0000       18.8218                                                                                                          
Cost of call options 1,075                                                                                                                                                              
Cost of call options, net of tax 699                                                                                                                                                              
Warrants exercise price (per share)   76.56                                                                                                                                                            
Common stock settled for warrants (in shares)   41                                                                                                                                                            
Common stock settled for warrants in future (in shares)   41                                                                                                                                                            
Proceeds from issuance of warrants   517                                                                                                                                                            
Warrants expired (in shares)   41                                                                                                                                                            
Carrying amount of the equity component                                                             547 547                                                                                                
Unamortized discount       (90) (1) 0 (177)                                               (90) (177)                                                                                                
Interest cost related to contractual interest coupon                                                         0 32 36 36                                                                                                
Interest cost related to amortization of the discount                                                         0 90 87 82                                                                                                
Line of Credit Facility                                                                                                                                                                
Maximum credit available               2,250                                                                                                                                               2,250
Short-term debt, weighted average interest rate               0.15% 0.25%                                                                                                                                              
Short-term advances to certain subsidiaries under credit agreements with various banks   184                                                                                                                                                            
Additional borrowing capacity                                                                                                                                                               $ 500