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Dispositions (Tables)
6 Months Ended
Jun. 30, 2011
Dispositions  
Schedule Of Selected Information Regarding Results Of Operations
     Three Months Ended
June 30,
2010
     Six Months Ended
June 30,
2010
 
(millions)              

Operating revenue

   $ —         $ 67   

Income (loss) before income taxes

     3         (134 )