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Acquisitions and Dispositions (Tables)
 6 Months Ended
Jun. 30, 2011
Acquisitions And Dispositions Tables [Abstract]  
Restructuring Costs and Other Charges
 
                 
    Three Months
 		    Six Months
 		 
    Ended
 		    Ended
 		 
    June 30,     June 30,  
    2011     2011  
    (In millions)  
 
Balance, beginning of period
  $ 13     $ 10  
Restructuring charges
    7       24  
Cash payments
    (11 )     (25 )
                 
Balance, end of period
  $ 9     $ 9  
                 
Restructuring charges incurred in current period
  $ 7     $ 24  
                 
Total restructuring charges incurred since inception of program
  $ 34     $ 34