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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2011
Income Taxes [Abstract] 
Net Operating Loss Carryforwards
Net Operating Loss Carryforwards  
  September 30, December 31, 
In millions2011  2010 
Federal $30  $54  
State  1,443   1,600  
Valuation allowance – State  21   21