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Loan Servicing (Tables)
12 Months Ended
Dec. 31, 2014
Loan Servicing  
Summary of Residential Mortgage Loans Managed or Securitized, Servicing Portfolio Information and Related Data
    December 31, 
    2014 2013 
          
    (Dollars in millions) 
 Mortgage loans managed or securitized$ 27,001 $ 27,349 
 Home equity loans managed (excludes home equity lines)  6,741   8,329 
 Total mortgage and home equity loans managed or securitized  33,742   35,678 
 Less:      
  LHFS  1,317   1,116 
  Mortgage loans acquired from FDIC   668   802 
  Mortgage loans sold with recourse   667   783 
 Mortgage loans held for investment $ 31,090 $ 32,977 
          
 UPB of mortgage loan servicing portfolio$ 115,476 $ 112,835 
 UPB of home equity loan servicing portfolio  6,781   8,386 
 UPB of residential mortgage and home equity loan servicing portfolio$ 122,257 $ 121,221 
 UPB of residential mortgage loans serviced for others (primarily agency      
  conforming fixed rate)$ 90,230 $ 87,434 
 Maximum recourse exposure from mortgage loans sold with recourse liability  344   372 
 Indemnification, recourse and repurchase reserves  94   72 
 FHA-insured mortgage loan reserve  85   

    As Of / For The  
    Year Ended December 31, 
    2014 2013 2012 
                
    (Dollars in millions) 
 UPB of residential mortgage loans sold from the LHFS portfolio$ 13,400  $ 28,900  $ 25,640  
 Pre-tax gains recognized on mortgage loans sold and held for sale  110    292    539  
 Servicing fees recognized from mortgage loans serviced for others  275    259    247  
 Approximate weighted average servicing fee on the outstanding balance            
  of residential mortgage loans serviced for others  0.29%   0.30%   0.32% 
 Weighted average interest rate on mortgage loans serviced for others  4.20    4.24    4.59  
Analysis of Activity in Residential MSRs
      Year Ended December 31, 
      2014 2013 2012 
               
      (Dollars in millions) 
 Carrying value, January 1, $ 1,047 $ 627 $ 563 
  Additions   141   336   270 
  Change in fair value due to changes in valuation inputs or assumptions:         
   Prepayment speeds  (219)   287   19 
   Weighted average OAS    (31)   (36) 
   Servicing costs  (2)   (29)   (22) 
  Realization of expected net servicing cash flows, passage of time and other  (123)   (143)   (167) 
 Carrying value, December 31,$ 844 $ 1,047 $ 627 
               
 Gains (losses) on derivative financial instruments used to mitigate the         
  income statement effect of changes in fair value$ 251 $ (197) $ 128 
Residential MSRs Sensitivity
    December 31, 2014 December 31, 2013 
    Range Weighted Range Weighted 
    Min Max Average Min Max Average 
                        
    (Dollars in millions) 
 Prepayment speed 10.8%  12.8%   12.0%  5.5%  8.0%   6.9% 
  Effect on fair value of a 10% increase       $ (30)        $ (33)  
  Effect on fair value of a 20% increase         (58)          (64)  
                        
 OAS 9.1%  9.9%   9.3%  9.1%  9.9%   9.3% 
  Effect on fair value of a 10% increase       $ (26)        $ (39)  
  Effect on fair value of a 20% increase         (50)          (75)  
                        
 Composition of loans serviced for others:                    
  Fixed-rate residential mortgage loans         99.4%         99.7% 
  Adjustable-rate residential mortgage loans         0.6          0.3  
   Total         100.0%         100.0% 
                        
 Weighted average life         5.7yrs         7.9yrs 
Summary of Commercial Mortgage Banking Activities
     December 31, 
     2014 2013 
           
     (Dollars in millions) 
 UPB of CRE mortgages serviced for others$ 27,599 $ 28,095 
 CRE mortgages serviced for others covered by recourse provisions  4,264   4,594 
 Maximum recourse exposure from CRE mortgages      
  sold with recourse liability  1,278   1,320 
 Recorded reserves related to recourse exposure  7   9 
 Originated CRE mortgages during the year  5,265   4,881