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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2015
Commitments and Contingencies  
Schedule of Commitments and Contingencies
     December 31, 2015 December 31, 2014
          
     (Dollars in millions)
Letters of credit$ 3,033 $ 3,462
Carrying amount of the liability for letters of credit  27   22
          
Investments in affordable housing and historic building rehabilitation projects:     
 Carrying amount  1,629   1,436
 Amount of future funding commitments included in carrying amount  654   459
 Lending exposure  292   169
 Tax credits subject to recapture  355   300
          
Investments in private equity and similar investments  289   329
Future funding commitments to consolidated private equity funds  231   202
Schedule of Impact of Adoption of Affordable Housing Guidance
       Year Ended December 31, 
       2014 2013 
             
       (Dollars in millions) 
 Increase in other income$ 141 $ 159 
 Increase in provision for income taxes  (161)   (158) 
 Change in net income and net income available to common shareholders$ (20) $ 1 
             
 Decrease in diluted EPS$ (0.03) $ 
             
       January 1, 
       2015 2014 
             
       (Dollars in millions) 
 Decrease to retained earnings$ (49) $ (29) 
Pledged Assets
    December 31, 
    2015 2014 
          
    (Dollars in millions) 
 Pledged securities$ 14,063 $ 14,636 
 Pledged loans  69,070   67,248