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Debt (Details 2) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 9 Months Ended
Nov. 26, 2011
Feb. 26, 2011
Nov. 27, 2010
Mar. 31, 2011
2016 and 2021 Notes
Nov. 26, 2011
2016 and 2021 Notes
Nov. 26, 2011
2021 Notes
Mar. 31, 2011
2021 Notes
Feb. 26, 2011
2021 Notes
Nov. 27, 2010
2021 Notes
Nov. 26, 2011
2016 Notes
Mar. 31, 2011
2016 Notes
Feb. 26, 2011
2016 Notes
Nov. 27, 2010
2016 Notes
Nov. 26, 2011
2013 Notes
Feb. 26, 2011
2013 Notes
Nov. 27, 2010
2013 Notes
Nov. 26, 2011
Convertible debentures
Feb. 26, 2011
Convertible debentures
Nov. 27, 2010
Convertible debentures
Jan. 31, 2002
Convertible debentures
Nov. 26, 2011
Financing Lease Obligations
Feb. 26, 2011
Financing Lease Obligations
Nov. 27, 2010
Financing Lease Obligations
Nov. 26, 2011
Capital Lease Obligations
Feb. 26, 2011
Capital Lease Obligations
Nov. 27, 2010
Capital Lease Obligations
Nov. 26, 2011
Other debt
Feb. 26, 2011
Other debt
Nov. 27, 2010
Other debt
Long-term Debt.                                                          
Total long-term debt $ 2,114 $ 1,152 $ 1,134     $ 648   $ 0 $ 0 $ 349   $ 0 $ 0 $ 500 $ 500 $ 500 $ 387 $ 402 $ 402 $ 402 $ 160 $ 170 $ 173 $ 68 $ 79 $ 57 $ 2 $ 1 $ 2
Less: current portion (427) [1] (441) [1] (33) [1]                                                    
Total long-term debt, less current portion 1,687 711 1,101                                                    
Long-term debt, fair value 2,121 1,210 1,235                                                    
Debt instrument issued, principal amount             650       350                                    
Interest rate (as a percent)           5.50%       3.75%             2.25%                        
Underwriting discounts       6                                                  
Net proceeds from the sale of the Notes       $ 990                                                  
Redemption price, as percentage of principal amount of debt instrument (as a percent)         100.00%                       100.00%                        
Redemption price upon control triggering event, percentage of principal amount (as a percent)         101.00%                                                
[1] Since holders of our convertible debentures may require us to purchase all or a portion of the debentures on January 15, 2012, we classified the $387 for such debentures in the current portion of long-term debt at November 26, 2011, and February 26, 2011.