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Debt (Details 3) (USD $)
12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Fixed rate senior notes
Dec. 31, 2010
Fixed rate senior notes
Dec. 31, 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
Feb. 07, 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
Dec. 31, 2011
5.00% senior notes due February 2021
Jul. 31, 2010
3.95% senior notes due September 2015
Dec. 31, 2011
3.95% senior notes due September 2015
Dec. 31, 2010
3.95% senior notes due September 2015
Sep. 30, 2010
6.25% senior notes due September 2015
Debt                            
Senior Notes, Current       $ 500,000,000                    
Amount used to fund hedged inventory         466,000,000                  
Debt instrument, interest rate (as a percent)       4.25% 4.25%   7.75% 7.75%   5.00%   3.95% 3.95% 6.25%
LIBOR       three-month LIBOR                    
Debt instrument face value   4,800,000,000 4,400,000,000       200,000,000   600,000,000   400,000,000     175,000,000
Debt instrument fair value   5,400,000,000 4,700,000,000                      
Percentage of face value at which senior notes are sold (as a percent)                 99.521%   99.889%      
Noncontrolling Interest, Ownership interest of reporting entity (as a percent) 100.00%                          
Loss on early redemption of senior notes           $ (23,000,000)               $ (6,000,000)