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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2011
Income Taxes [Abstract]  
Net Operating Loss Carryforwards
Net Operating Loss Carryforwards  
  June 30, December 31, 
In millions2011  2010 
Federal $30  $54  
State  1,485   1,600  
Valuation allowance – State  21   21