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Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2011
Pension Plans [Member]
 
Schedule Of Defined Benefit Plans Disclosures
Postretirement Benefit Plans [Member]
 
Schedule Of Defined Benefit Plans Disclosures
                         
  For the Three Months Ended   For the Six Months Ended  
    June 30,       June 30,    
  2011       2010     2011     2010  
          (in millions)          
Service cost $ 8   $ 10   $ 18   $ 20  
Interest cost   41     44     83     86  
Amortization:                        
Net loss from experience differences   15     14     31     27  
Prior service credit   (8 )   (8 )   (16 )   (16 )
Net postretirement health care costs $ 56   $ 60   $ 116   $ 117  
Postemployment Benefit Plans [Member]
 
Schedule Of Defined Benefit Plans Disclosures
                       
    For the Three Months Ended   For the Six Months Ended  
      June 30,         June 30,      
    2011       2010   2011   2010  
            (in millions)        
Service cost $   3   $ 1 $ 5   $ 4
Interest cost     2     2   5     4
Amortization of net gains     (1 )     (1 )  
Net postemployment costs $   4   $ 3 $ 9   $ 8