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Variable Interest Entities (Tables)
12 Months Ended
Dec. 31, 2011
Variable Interest Entities (Tables) [Abstract]  
Variable Interest Entities Information
                                         
    Consolidated VIEs     Unconsolidated VIEs  
in millions  

Total

Assets

   

Total

Liabilities

   

Total

Assets

    Total
Liabilities
    Maximum
Exposure to Loss
 

December 31, 2011

                                       

LIHTC funds

  $             82       N/A     $             125              

Education loan securitization trusts

    2,761     $             2,549       N/A       N/A       N/A  

LIHTC investments

    N/A       N/A       993           $ 482