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Financing Arrangements (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Apr. 26, 2013
Apr. 27, 2012
Apr. 26, 2013
Short-term Debt
Apr. 27, 2012
Short-term Debt
Apr. 26, 2013
Long-term Debt
Apr. 27, 2012
Long-term Debt
Apr. 26, 2013
Debt Instrument, Unamortized Debt Discount
Apr. 26, 2013
Commercial Paper
Apr. 27, 2012
Commercial Paper
Apr. 26, 2013
Commercial Paper
Short-term Debt
Apr. 27, 2012
Commercial Paper
Short-term Debt
Apr. 26, 2013
Capital Lease Obligations
Apr. 27, 2012
Capital Lease Obligations
Apr. 26, 2013
Capital Lease Obligations
Short-term Debt
Apr. 27, 2012
Capital Lease Obligations
Short-term Debt
Apr. 26, 2013
Capital Lease Obligations
Long-term Debt
Apr. 27, 2012
Capital Lease Obligations
Long-term Debt
Apr. 26, 2013
Bank Borrowings
Apr. 27, 2012
Bank Borrowings
Apr. 26, 2013
Bank Borrowings
Short-term Debt
Apr. 27, 2012
Bank Borrowings
Short-term Debt
Apr. 26, 2013
Bank Borrowings
Long-term Debt
Apr. 26, 2013
Senior Notes
2013 Senior Notes
Apr. 26, 2013
Senior Notes
Senior Notes 2013 Due 2018
Apr. 27, 2012
Senior Notes
Senior Notes 2013 Due 2018
Apr. 26, 2013
Senior Notes
Senior Notes 2013 Due 2018
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2013 Due 2018
Long-term Debt
Apr. 26, 2013
Senior Notes
Senior Notes 2013 Due 2023
Apr. 27, 2012
Senior Notes
Senior Notes 2013 Due 2023
Apr. 26, 2013
Senior Notes
Senior Notes 2013 Due 2023
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2013 Due 2023
Long-term Debt
Apr. 26, 2013
Senior Notes
Senior Notes 2013 Due 2043
Apr. 27, 2012
Senior Notes
Senior Notes 2013 Due 2043
Apr. 26, 2013
Senior Notes
Senior Notes 2013 Due 2043
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2013 Due 2043
Long-term Debt
Apr. 26, 2013
Senior Notes
Senior Notes 2005 Due 2016
Apr. 27, 2012
Senior Notes
Senior Notes 2005 Due 2016
Apr. 26, 2013
Senior Notes
Senior Notes 2005 Due 2016
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2005 Due 2016
Long-term Debt
Apr. 26, 2013
Senior Notes
Senior Notes 2009 Due 2014
Apr. 27, 2012
Senior Notes
Senior Notes 2009 Due 2014
Apr. 26, 2013
Senior Notes
Senior Notes 2009 Due 2014
Short-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2009 Due 2014
Short-term Debt
Apr. 26, 2013
Senior Notes
Senior Notes 2009 Due 2014
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2009 Due 2014
Long-term Debt
Apr. 26, 2013
Senior Notes
Senior Notes 2009 Due 2019
Apr. 27, 2012
Senior Notes
Senior Notes 2009 Due 2019
Apr. 26, 2013
Senior Notes
Senior Notes 2009 Due 2019
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2009 Due 2019
Long-term Debt
Apr. 26, 2013
Senior Notes
Senior Notes 2009 Due 2039
Apr. 27, 2012
Senior Notes
Senior Notes 2009 Due 2039
Apr. 26, 2013
Senior Notes
Senior Notes 2009 Due 2039
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2009 Due 2039
Long-term Debt
Apr. 26, 2013
Senior Notes
Senior Notes 2010 Due 2015
Apr. 27, 2012
Senior Notes
Senior Notes 2010 Due 2015
Apr. 26, 2013
Senior Notes
Senior Notes 2010 Due 2015
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2010 Due 2015
Long-term Debt
Apr. 26, 2013
Senior Notes
Senior Notes 2010 Due 2020
Apr. 27, 2012
Senior Notes
Senior Notes 2010 Due 2020
Apr. 26, 2013
Senior Notes
Senior Notes 2010 Due 2020
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2010 Due 2020
Long-term Debt
Apr. 26, 2013
Senior Notes
Senior Notes 2010 Due 2040
Apr. 27, 2012
Senior Notes
Senior Notes 2010 Due 2040
Apr. 26, 2013
Senior Notes
Senior Notes 2010 Due 2040
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2010 Due 2040
Long-term Debt
Apr. 26, 2013
Senior Notes
Senior Notes 2011 Due 2016
Apr. 27, 2012
Senior Notes
Senior Notes 2011 Due 2016
Apr. 26, 2013
Senior Notes
Senior Notes 2011 Due 2016
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2011 Due 2016
Long-term Debt
Apr. 26, 2013
Senior Notes
Senior Notes 2011 Due 2021
Apr. 27, 2012
Senior Notes
Senior Notes 2011 Due 2021
Apr. 26, 2013
Senior Notes
Senior Notes 2011 Due 2021
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2011 Due 2021
Long-term Debt
Apr. 26, 2013
Senior Notes
Senior Notes 2012 Due 2022
Apr. 27, 2012
Senior Notes
Senior Notes 2012 Due 2022
Apr. 26, 2013
Senior Notes
Senior Notes 2012 Due 2022
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2012 Due 2022
Long-term Debt
Apr. 26, 2013
Senior Notes
Senior Notes 2012 Due 2042
Apr. 27, 2012
Senior Notes
Senior Notes 2012 Due 2042
Apr. 26, 2013
Senior Notes
Senior Notes 2012 Due 2042
Long-term Debt
Apr. 27, 2012
Senior Notes
Senior Notes 2012 Due 2042
Long-term Debt
Apr. 26, 2013
Senior Convertible Notes
Apr. 27, 2012
Senior Convertible Notes
Apr. 29, 2011
Senior Convertible Notes
Apr. 26, 2013
Senior Convertible Notes
Senior Convertible Notes Due 2011
Apr. 26, 2013
Senior Convertible Notes
Senior Convertible Notes Due 2013
Apr. 27, 2012
Senior Convertible Notes
Senior Convertible Notes Due 2013
Apr. 26, 2013
Senior Convertible Notes
Senior Convertible Notes Due 2013
Short-term Debt
Apr. 27, 2012
Senior Convertible Notes
Senior Convertible Notes Due 2013
Short-term Debt
Apr. 29, 2011
Senior Convertible Notes
Apr. 26, 2013
Interest Rate Swap
Apr. 27, 2012
Interest Rate Swap
Apr. 26, 2013
Credit Facility
Apr. 26, 2013
Credit Facility
Line of Credit Facility 2017
Apr. 26, 2013
Credit Facility
Line of Credit Facility 2014
Apr. 26, 2013
Contingent Convertible Debenture
General Disclosures                                                                                                                                                                                                
Short-term borrowings $ 910 $ 3,274           $ 125 $ 950     $ 14 $ 14         $ 221 $ 200                                         $ 550 $ 0                                                                                 $ 2,200 $ 2,200 $ 2,200     $ 2,200                  
Long-term debt 9,741 7,359                   152 165         3 0         1,000 0     1,250 0     750 0     600 600     0 550         400 400     300 300     1,250 1,250     1,250 1,250     500 500     500 500     500 500     675 675     400 400                       181 167        
Gains from interest rate swap terminations 50 102                                                                                                                                                                                            
Debt Instrument, Unamortized Discount     0 (90) (20) 0                                                                                                                                                                                    
Maturity (in fiscal year)                                   2015           2018       2023       2043       2016       2014           2019       2039       2015       2020       2040       2016       2021       2022       2042               2013                   2013
Earliest maturity (in fiscal year)             2018 2013           2013   2013   2013                                                                                                                                                 2015          
Last maturity (in fiscal year)             2043 2014           2014   2025   2014                                                                                                                                                 2022          
Average interest rate                   0.21% 0.14%     3.30% 3.38% 3.59% 3.57%     0.57% 0.93% 5.00%       1.38% 0.00%     2.75% 0.00%     4.00% 0.00%     4.75% 4.75%     4.50% 0.00% 0.00% 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% 3.13%     4.50% 4.50%             0.00% 1.63%              
Effective interest rate                                               1.41% 0.00%         2.78% 0.00%     4.12% 0.00%     4.76% 4.76%     4.50% 0.00% 0.00% 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% 3.16%     4.51% 4.51%             0.00% 6.03%              
Principal amount                                             3,000 1,000       1,250       750       600 600                                 1,250 1,250                     500 500     500 500     675 675                   2,200 0 2,200                  
Debt Instrument, Interest Rate, Stated Percentage                                               1.375%       2.75%       4.00%       4.75% 4.75%                                 3.00% 3.00%                     2.625% 2.625%     4.125% 4.125%     3.125% 3.125%                   1.50% 1.625%                    
Debt Instrument, Convertible, Interest Expense, Contractual Interest Coupon                                                                                                                                                                           35 36     68            
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                                                                                                                                                                                              
Warrants expired (in shares) 41 41                                                                                                                                                                                            
Carrying amount of the equity component                                                                                                                                                                             547                  
Interest cost related to amortization of the discount                                                                                                                                                                           90 87     172            
Line of Credit Facility                                                                                                                                                                                                
Maximum credit available               2,250                                                                                                                                                                           2,250 2,250  
Debt, Weighted Average Interest Rate During Period               0.18% 0.15%                                                                                                                                                                              
Short-term advances to certain subsidiaries under credit agreements with various banks 218                                                                                                                                                                                              
Long-term Debt, Gross 10,094                                 224                                                                                                                                                            
Short-term debt, Weighted Average Original Maturity               89 days 102 days                                                                                                                                                                              
Additional borrowing capacity                                                                                                                                                                                         $ 750      
Length of extension from maturity date                                                                                                                                                                                           1 year    
Term of credit facility                                                                                                                                                                                             4 years