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Long-Term Debt (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Five year revolving credit facility [Member]
Dec. 31, 2011
7.25% interest payable semiannually on Senior Notes due on May 1, 2011 [Member]
May 01, 2011
7.25% interest payable semiannually on Senior Notes due on May 1, 2011 [Member]
Dec. 31, 2010
7.25% interest payable semiannually on Senior Notes due on May 1, 2011 [Member]
Dec. 31, 2011
5.65% interest payable semiannually on Senior Notes due on November 15, 2012 [Member]
Dec. 31, 2010
5.65% interest payable semiannually on Senior Notes due on November 15, 2012 [Member]
Dec. 31, 2011
5.5% interest payable semiannually on Senior Notes due on November 19, 2012 [Member]
Dec. 31, 2010
5.5% interest payable semiannually on Senior Notes due on November 19, 2012 [Member]
Dec. 31, 2011
6.5% interest payable semiannually on Senior Notes due on March 15, 2011 [Member]
Mar. 15, 2011
6.5% interest payable semiannually on Senior Notes due on March 15, 2011 [Member]
Dec. 31, 2010
6.5% interest payable semiannually on Senior Notes due on March 15, 2011 [Member]
Dec. 31, 2011
6.125% interest payable semiannually on Senior Notes due on August 15, 2015 [Member]
Dec. 31, 2010
6.125% interest payable semiannually on Senior Notes due on August 15, 2015 [Member]
Debt (Textual) [Abstract]                            
Senior notes interest rate     7.25%     5.65%   5.50%   6.50%     6.125%  
Cash prepaid, unsecured senior notes     $ 0 $ 200,000,000 $ 201,000,000 $ 200,000,000 $ 200,000,000 $ 150,000,000 $ 151,000,000 $ 0 $ 150,000,000 $ 150,000,000 $ 151,000,000 $ 151,000,000
Line of Credit Facility [Line Items]                            
Unsecured revolving credit facility   2,000,000,000                        
Outstanding letters of credit 862,000,000 0                        
Long-Term Debt (Textual) [Abstract]                            
Funds available under revolving credit facility 1,138,000,000                          
Outstanding letters of credit under various bilateral committed letter of credit facilities $ 1,863,000,000                          
Interest rate under multicurrency facility LIBOR, NIBOR or EURIBOR plus 0.26%                          
Variable rate basis LIBOR, NIBOR or EURIBOR                          
Variable rate 0.26%