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Loan Servicing (Tables)
6 Months Ended
Jun. 30, 2013
Loan Servicing [Abstract]  
Summary of Residential Mortgage Loans Managed or Securitized, Servicing Portfolio Information and Related Data
    June 30, December 31, 
    2013 2012 
          
    (Dollars in millions) 
 Mortgage loans managed or securitized (1) $ 28,014 $ 29,882 
 Less: Loans securitized and transferred to AFS securities  4   4 
  LHFS  2,419   3,547 
  Covered mortgage loans   910   1,040 
  Mortgage loans sold with recourse   886   1,019 
 Mortgage loans held for investment $ 23,795 $ 24,272 
          
 Mortgage loans on nonaccrual status$ 254 $ 269 
 Mortgage loans 90 days or more past due and still accruing interest (2)   68   92 
 Mortgage loans net charge-offs - year to date  47   133 
 UPB of residential mortgage loan servicing portfolio  107,057   101,270 
 UPB of residential mortgage loans serviced for others (primarily agency conforming      
  fixed rate)  80,846   73,769 
 Maximum recourse exposure from mortgage loans sold with recourse liability  403   446 
 Recorded reserves related to recourse exposure  12   12 
 Repurchase reserves for mortgage loan sales to GSEs  59   59 
          
          
(1)Balances exclude loans serviced for others with no other continuing involvement.
(2)Includes amounts related to residential mortgage LHFS and excludes amounts related to government guaranteed loans and covered mortgage loans.

    As Of / For The  
    Six Months Ended June 30, 
    2013 2012 
            
    (Dollars in millions)  
 UPB of residential mortgage loans sold from the held for sale portfolio$ 16,541  $ 12,675  
 Pre-tax gains recognized on mortgage loans sold and held for sale  219    236  
 Servicing fees recognized from mortgage loans serviced for others  127    121  
 Approximate weighted average servicing fee on the outstanding balance of         
  residential mortgage loans serviced for others  0.31%   0.33% 
 Weighted average coupon interest rate on mortgage loans serviced for others  4.32    4.81  
Analysis of Activity in Residential Mortgage Servicing Assets
     Six Months Ended June 30, 
      2013  2012 
           
     (Dollars in millions) 
 Carrying value, January 1, $ 627 $ 563 
  Additions   192   134 
  Change in fair value due to changes in valuation inputs or assumptions:      
   Prepayment speeds  218   12 
   Weighted average OAS  (44)   (36) 
   Servicing costs  (21)   (22) 
  Realization of expected net servicing cash flows, passage of time and other  (80)   (73) 
 Carrying value, June 30,$ 892 $ 578 
           
 Gains (losses) on derivative financial instruments used to mitigate the      
  income statement effect of changes in fair value$ (133) $ 99 
Residential Mortgage Servicing Rights Sensitivity
    June 30, 2013 
    Range Weighted 
    Minimum Maximum Average 
              
          (Dollars in millions) 
              
 Prepayment speed 6.9%  11.9%   8.7% 
  Effect on fair value of a 10% increase       $ (32)  
  Effect on fair value of a 20% increase         (63)  
              
 OAS 9.5%  10.2%   9.7% 
  Effect on fair value of a 10% increase       $ (33)  
  Effect on fair value of a 20% increase         (63)  
              
 Composition of residential loans serviced for others:          
  Fixed-rate mortgage loans         99.6% 
  Adjustable-rate mortgage loans         0.4  
   Total         100.0% 
              
 Weighted average life         7.1yrs 
Summary of Commercial Mortgage Banking Activities
     June 30, December 31, 
     2013 2012 
           
     (Dollars in millions) 
 UPB of CRE mortgages serviced for others$ 28,461 $ 29,520 
 CRE mortgages serviced for others covered by recourse provisions  5,012   4,970 
 Maximum recourse exposure from CRE mortgages      
  sold with recourse liability  1,384   1,368 
 Recorded reserves related to recourse exposure  12   13 
 Originated CRE mortgages during the period - year to date  1,990   4,934