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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2014
Commitments and Contingencies  
Schedule of Commitments and Contingencies
       September 30, December 31, 
       2014 2013 
             
       (Dollars in millions) 
 Letters of credit and financial guarantees$ 3,608 $ 4,355 
 Carrying amount of the liability for letter of credit guarantees  21   39 
             
 Investments related to affordable housing and historic building rehabilitation projects  1,371   1,302 
 Amount of future funding commitments included in investments related to affordable      
  housing and historic rehabilitation projects  429   464 
 Lending exposure to these affordable housing projects  84   151 
 Tax credits subject to recapture related to affordable housing projects  284   250 
             
 Investments in private equity and similar investments  305   291 
 Future funding commitments to consolidated private equity funds  208   245 
Pledged Assets
    September 30, December 31, 
    2014 2013 
          
    (Dollars in millions) 
 Pledged securities$ 13,710 $ 11,911 
 Pledged loans  66,691   66,391