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Debt (Details 3) (USD $)
6 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2011
Fixed rate senior notes
Dec. 31, 2010
Fixed rate senior notes
Jun. 30, 2011
4.25% senior notes due September 2012
Dec. 31, 2010
4.25% senior notes due September 2012
Feb. 28, 2011
7.75% senior notes due October 2012
Jun. 30, 2011
7.75% senior notes due October 2012
Dec. 31, 2010
7.75% senior notes due October 2012
Jan. 31, 2011
5.00% senior notes due February 2021
Jun. 30, 2011
5.00% senior notes due February 2021
Debt                      
Amount used to fund hedged inventory         $ 500,000,000 $ 466,000,000          
Issuance of senior notes 597,000,000                    
Debt instrument, interest rate (as a percent)         4.25% 4.25%     7.75%   5.00%
Percentage of face value at which senior notes are sold (as a percent)                   99.521%  
Early redemption of senior notes             200,000,000        
Loss on early redemption of senior notes               23,000,000      
Debt instrument face value     4,800,000,000 4,400,000,000           600,000,000  
Debt instrument fair value     5,200,000,000 4,700,000,000              
Outstanding letters of credit $ 95,000,000 $ 75,000,000