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Debt (Tables)
9 Months Ended
Sep. 30, 2011
Debt [Abstract] 
Debt
Debt consists of (in millions):
                 
    September 30,     December 31,  
    2011     2010  
Senior Notes, interest at 6.5% payable semiannually, principal due on March 15, 2011
  $ —     $ 150  
 
               
Senior Notes, interest at 7.25% payable semiannually, principal due on May 1, 2011
    —       201  
 
               
Senior Notes, interest at 5.65% payable semiannually, principal due on November 15, 2012
    200       200  
 
               
Senior Notes, interest at 5.5% payable semiannually, principal due on November 19, 2012
    150       151  
 
               
Senior Notes, interest at 6.125% payable semiannually, principal due on August 15, 2015
    151       151  
 
               
Other
    11       34  
 
           
Total debt
    512       887  
Less current portion
    2       373  
 
           
Long-term debt
  $ 510     $ 514