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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2014
Commitments and Contingencies  
Schedule of Commitments and Contingencies
       June 30, December 31, 
       2014 2013 
             
       (Dollars in millions) 
 Letters of credit and financial guarantees$ 3,935 $ 4,355 
 Carrying amount of the liability for letter of credit guarantees  38   39 
             
 Investments related to affordable housing and historic building rehabilitation projects  1,326   1,302 
 Amount of future funding commitments included in investments related to affordable      
  housing and historic rehabilitation projects  404   464 
 Lending exposure to these affordable housing projects  89   151 
 Tax credits subject to recapture related to affordable housing projects  269   250 
             
 Investments in private equity and similar investments  322   291 
 Future funding commitments to consolidated private equity funds  207   245 
Pledged Assets
    June 30, December 31, 
    2014 2013 
          
    (Dollars in millions) 
 Pledged securities$ 9,377 $ 11,911 
 Pledged loans  66,901   66,391