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Variable Interest Entities (Tables)
6 Months Ended
Jun. 30, 2012
Basis of Presentation and Variable Interest Entities [Abstract]  
Variable Interest Entities Information
                                                 
        Consolidated VIEs         Unconsolidated VIEs  
in millions       Total
        Assets
    Total
            Liabilities
        Total
    Assets
    Total
              Liabilities
    Maximum
      Exposure to Loss
 

 

 

June 30, 2012

                                               

LIHTC funds

  $     91        84      $     119        —        —   

Education loan securitization trusts

        2,611      $ 2,401            N/A       N/A       N/A  

LIHTC investments

        N/A       N/A           1,012        —      $ 494