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Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
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
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
6.125% 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                            
Senior Notes     $ 0 $ 150 $ 150 $ 0 $ 200 $ 201 $ 200 $ 200 $ 150 $ 151 $ 151 $ 151
Other 9 34                        
Total debt 510 887                        
Less current portion 351 373                        
Long-term debt $ 159 $ 514