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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2014
Income Taxes [Abstract]  
Net Operating Loss Carryforwards and Tax Credit Carryforwards
Table 121: Net Operating Loss Carryforwards and Tax Credit Carryforwards 
  June 30 December 31 
In millions2014 2013 
Net Operating Loss Carryforwards:       
 Federal $1,066 $1,116 
 State  2,779  2,958 
Tax Credit Carryforwards:       
 Federal $154 $221 
 State  7  7