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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2013
Commitments and Contingencies  
Schedule of Commitments and Contingencies
       December 31, 
       2013 2012 
             
       (Dollars in millions) 
 Letters of credit and financial guarantees written$ 4,355 $ 5,164 
 Carrying amount of the liability for letter of credit guarantees  39   30 
             
 Investments related to affordable housing and historic building rehabilitation projects  1,302   1,223 
 Amount of future funding commitments included in investments related to affordable      
  housing and historic rehabilitation projects  464   461 
 Lending exposure to these affordable housing projects  151   87 
 Tax credits subject to recapture related to affordable housing projects  250   193 
             
 Investments in private equity and similar investments  291   323 
 Future funding commitments to private equity and similar investments  245   129