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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2014
Income Taxes  
Schedule of Components of Income Tax Expense (Benefit)
       Year Ended December 31, 
       2014 2013 2012 
                
       (Dollars in millions) 
 Current expense:         
  Federal$ 551 $ 1,007 $ 275 
  State  82   100   70 
 Total current expense  633   1,107   345 
 Deferred expense:         
  Federal  115   256   396 
  State  12   32   23 
 Total deferred expense  127   288   419 
 Provision for income taxes$ 760 $ 1,395 $ 764 
Schedule of Effective Income Tax Rate Reconciliation
       Year Ended December 31, 
       2014 2013 2012 
                   
       (Dollars in millions)  
 Federal income taxes at statutory rate of 35%$ 1,045  $ 1,093  $ 977  
 Increase (decrease) in provision for income taxes as a result of:            
  State income taxes, net of Federal tax benefit  61    86    61  
  Federal tax credits  (171)    (152)    (126)  
  Tax exempt income  (125)    (128)    (133)  
  Adjustments for uncertain tax positions  (39)    516     
  Other, net  (11)    (20)    (15)  
 Provision for income taxes$ 760  $ 1,395  $ 764  
 Effective income tax rate  25.5%   44.7%   27.4% 
Schedule of Deferred Tax Assets and Liabilities
       December 31, 
       2014 2013 
             
       (Dollars in millions) 
 Deferred tax assets:      
  ALLL$ 556 $ 655 
  Postretirement plans  372   180 
  Net unrealized loss on AFS securities  36   172 
  Equity-based compensation  137   152 
  Reserves and expense accruals  247   181 
  Other  242   189 
 Total deferred tax assets  1,590   1,529 
             
 Deferred tax liabilities:      
  Prepaid pension plan expense  477   431 
  MSRs  312   380 
  Lease financing  375   315 
  Loan fees and expenses  265   263 
  Identifiable intangible assets  139   128 
  Derivatives and hedging  122   45 
  Other  93   120 
 Total deferred tax liabilities  1,783   1,682 
   Net deferred tax liability$ (193) $ (153) 
Changes in Unrecognized Tax Benefits
       As of/ For the Year Ended December 31, 
       2014 2013 2012 
                
       (Dollars in millions) 
 Beginning balance of unrecognized tax benefits$ 644 $ 297 $ 301 
  Additions based on tax positions related to current year  1   18   14 
  Additions (reductions) for tax positions of prior years  (34)   343   
  Settlements  (17)     (5) 
  Unrecognized deferred tax benefits from business acquisitions  (91)   (14)   (13) 
 Ending balance of unrecognized tax benefits$ 503 $ 644 $ 297 
                
 Unrecognized tax benefits that would have impacted effective rate if recognized          
  Federal$ 497 $ 631 $ 288 
  State  4   11   9