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Loan Servicing (Tables)
9 Months Ended
Sep. 30, 2012
Loan Servicing [Abstract]  
Summary of Residential Mortgage Loans Managed or Securitized, Servicing Portfolio Information and Related Data
    September 30, December 31, 
    2012 2011 
          
    (Dollars in millions) 
 Mortgage loans managed or securitized (1) $ 29,809 $ 26,559 
 Less: Loans securitized and transferred to securities available for sale  4   4 
  Loans held for sale   3,321   3,394 
  Covered mortgage loans   1,106   1,264 
  Mortgage loans sold with recourse   1,085   1,316 
 Mortgage loans held for investment $ 24,293 $ 20,581 
 Mortgage loans on nonaccrual status$ 266 $ 308 
 Mortgage loans 90 days or more past due and still accruing interest (2)   80   104 
 Mortgage loans net charge-offs - year to date  105   264 
 Unpaid principal balance of residential mortgage loans servicing portfolio  99,537   91,640 
 Unpaid principal balance of residential mortgage loans serviced for others  72,343   67,066 
 Maximum recourse exposure from mortgage loans sold with recourse liability  466   522 
 Recorded reserves related to recourse exposure  13   6 
 Repurchase reserves for mortgage loan sales to GSEs  58   29 
          
          
(1)Balances exclude loans serviced for others with no other continuing involvement.
(2)Includes amounts related to residential mortgage loans held for sale and excludes amounts related to government guaranteed loans and covered mortgage loans. Refer to Loans and Leases Note for additional disclosures related to past due government guaranteed loans.

    As of / For the  
    Nine Months Ended September 30, 
    2012 2011 
            
    (Dollars in millions)  
 Unpaid principal balance of residential mortgage loans sold from the held for         
  sale portfolio$ 18,680  $ 11,961  
 Pre-tax gains recognized on mortgage loans sold and held for sale  380    109  
 Servicing fees recognized from mortgage loans serviced for others  182    179  
 Approximate weighted average servicing fee of the outstanding balance of         
  residential mortgage loans serviced for others  0.32%   0.34% 
 Weighted average coupon interest rate on mortgage loans serviced for others  4.71    5.10  
Schedule of Residential Mortgage Servicing Assets
     Residential Mortgage Servicing Rights 
     Nine Months Ended September 30, 
      2012  2011 
           
     (Dollars in millions) 
 Carrying value, January 1, $ 563 $ 830 
  Additions   195   165 
  Increase (decrease) in fair value:       
    Due to changes in valuation inputs or assumptions  (67)   (319) 
   Other changes (1)  (128)   (103) 
 Carrying value, September 30,$ 563 $ 573 
           
           
(1)Represents the realization of expected net servicing cash flows, expected borrower payments and the passage of time. 
Residential Mortgage Servicing Rights Sensitivity
       Residential 
       Mortgage Servicing Rights 
       September 30, 2012 
            
       (Dollars in millions) 
    Fair value of residential mortgage servicing rights  $ 563  
    Composition of residential loans serviced for others:     
     Fixed-rate mortgage loans    99% 
     Adjustable-rate mortgage loans    1  
      Total    100% 
    Weighted average life    3.9yrs 
            
    Prepayment speed    19.6% 
     Effect on fair value of a 10% increase  $ (35)  
     Effect on fair value of a 20% increase    (66)  
            
    Weighted average discount rate    10.6% 
     Effect on fair value of a 10% increase  $ (19)  
     Effect on fair value of a 20% increase    (37)  
Summary of Commercial Mortgage Banking Activities
     September 30, December 31, 
     2012 2011 
           
     (Dollars in millions) 
 Unpaid principal balance of commercial real estate mortgages serviced for others$ 25,982 $ 25,367 
 Commercial real estate mortgages serviced for others covered by recourse provisions  4,847   4,520 
 Maximum recourse exposure from commercial real estate mortgages       
  sold with recourse liability  1,327   1,226 
 Recorded reserves related to recourse exposure  14   15 
 Originated commercial real estate mortgages during the period - year to date  3,342   4,803