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Variable Interest Entities (Tables)
3 Months Ended
Mar. 31, 2012
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
 

March 31, 2012

                                       

LIHTC funds

  $ 87        N/A     $ 124        —        —   

Education loan securitization trusts

    2,747      $ 2,542        N/A       N/A       N/A  

LIHTC investments

    N/A       N/A       1,035        —      $ 490