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Debt (Details 2) (USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Mar. 03, 2012
Feb. 26, 2011
Jun. 30, 2008
2013 Notes [Member]
Mar. 03, 2012
2013 Notes [Member]
Feb. 26, 2011
2013 Notes [Member]
Mar. 31, 2011
2016 and 2021 Notes [Member]
Mar. 03, 2012
2016 and 2021 Notes [Member]
Mar. 03, 2012
2016 Notes [Member]
Mar. 31, 2011
2016 Notes [Member]
Feb. 26, 2011
2016 Notes [Member]
Mar. 03, 2012
2021 Notes [Member]
Mar. 31, 2011
2021 Notes [Member]
Feb. 26, 2011
2021 Notes [Member]
Mar. 03, 2012
Convertible debentures [Member]
Nov. 26, 2011
Convertible debentures [Member]
Feb. 26, 2011
Convertible debentures [Member]
Jan. 31, 2002
Convertible debentures [Member]
Mar. 03, 2012
Financing Lease Obligations [Member]
Feb. 26, 2011
Financing Lease Obligations [Member]
Mar. 03, 2012
Capital Lease Obligations [Member]
Feb. 26, 2011
Capital Lease Obligations [Member]
Mar. 03, 2012
Other debt [Member]
Feb. 26, 2011
Other debt [Member]
Long-term Debt.                                              
Total long-term debt $ 1,728 $ 1,152   $ 500 $ 500     $ 349   $ 0 $ 648   $ 0 $ 0   $ 402 $ 402 $ 149 $ 170 $ 81 $ 79 $ 1 $ 1
Less: current portion (43) (441)                                          
Total long-term debt, less current portion 1,685 711                                          
Long-term debt, fair value 1,756 1,210                                          
Debt instrument issued, principal amount     500           350     650                      
Initial issuance discount and offering expenses     1                                        
Interest rate (as a percent)       6.75%       3.75%     5.50%       2.25%                
Underwriting discounts           6                                  
Net proceeds from the sale of the Notes     496     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%     101.00%                                
Future maturities of long-term debt, including capitalized leases                                              
2012 40                                            
2013 542                                            
2014 40                                            
2015 32                                            
2016 369                                            
Thereafter $ 705