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Loan Servicing (Tables)
3 Months Ended
Mar. 31, 2012
Loan Servicing [Abstract]  
Summary of Residential Mortgage Loans Managed or Securitized and Related Delinquencies and Net Charge-Offs
    March 31, December 31, 
    2012 2011 
          
    (Dollars in millions) 
 Mortgage loans managed or securitized (1) $ 26,166 $ 26,559 
 Less: Loans securitized and transferred to securities available for sale  4   4 
  Loans held for sale   2,209   3,394 
  Covered mortgage loans   1,212   1,264 
  Mortgage loans sold with recourse   1,228   1,316 
 Mortgage loans held for investment $ 21,513 $ 20,581 
 Mortgage loans on nonaccrual status$ 320 $ 308 
 Mortgage loans 90 days or more past due and still accruing interest (2)   72   104 
 Mortgage loans net charge-offs (3)  41   264 
          
          
(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.
(3)Net charge-offs for March 31, 2012 reflect three months.
Schedule of Residential Mortgage Servicing Assets
     Residential Mortgage Servicing Rights 
     Three Months Ended March 31, 
      2012  2011 
           
     (Dollars in millions) 
 Carrying value, January 1, $ 563 $ 830 
  Additions   84   86 
  Increase (decrease) in fair value:      
   Due to changes in valuation inputs or assumptions  92   40 
  Other changes (1)   (43)   (28) 
 Carrying value, March 31,$ 696 $ 928 
           
           
(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 
       March 31, 2012 
            
       (Dollars in millions) 
    Fair value of residential mortgage servicing rights  $ 696  
    Composition of residential loans serviced for others:     
     Fixed-rate mortgage loans    99% 
     Adjustable-rate mortgage loans    1  
      Total    100% 
    Weighted average life    4.5yrs 
            
    Prepayment speed    16.5% 
     Effect on fair value of a 10% increase  $ (39)  
     Effect on fair value of a 20% increase    (73)  
            
    Weighted average discount rate    9.8% 
     Effect on fair value of a 10% increase  $ (25)  
     Effect on fair value of a 20% increase    (48)