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Securities (Tables)
9 Months Ended
Sep. 30, 2013
Securities  
Amortized Cost, Gross Unrealized Gains and Losses and Approximate Fair Values of Securities Available for Sale
     Amortized Gross Unrealized Fair 
 September 30, 2013 Cost Gains Losses Value 
                 
     (Dollars in millions) 
 AFS securities:             
  GSE securities $ 549 $ $ $ 549 
  MBS issued by GSE    18,957   128   369   18,716 
  States and political subdivisions    1,892   69   102   1,859 
  Non-agency MBS   273   10   5   278 
  Other securities    17       17 
  Covered securities    1,033   413     1,446 
   Total AFS securities $ 22,721 $ 620 $ 476 $ 22,865 

     Amortized Gross Unrealized Fair 
 December 31, 2012 Cost Gains Losses Value 
                 
     (Dollars in millions) 
 AFS securities:             
  GSE securities $ 290 $ $ $ 290 
  MBS issued by GSE    20,482   466   18   20,930 
  States and political subdivisions    1,948   153   90   2,011 
  Non-agency MBS   307   16   11   312 
  Other securities    3       3 
  Covered securities    1,147   444     1,591 
   Total AFS securities $ 24,177 $ 1,079 $ 119 $ 25,137 
Amortized Cost, Gross Unrealized Gains and Losses and Approximate Fair Values of Securities Held to Maturity
     Amortized Gross Unrealized Fair 
 September 30, 2013 Cost Gains Losses Value 
                 
     (Dollars in millions) 
 HTM securities:             
  GSE securities $ 5,382 $ 3 $ 328 $ 5,057 
  Mortgage-backed securities issued by GSE    7,668   27   61   7,634 
  States and political subdivisions    32   1   1   32 
  Other securities    447   11     458 
   Total HTM securities $ 13,529 $ 42 $ 390 $ 13,181 

     Amortized Gross Unrealized Fair 
 December 31, 2012 Cost Gains Losses Value 
                 
     (Dollars in millions) 
 HTM securities:             
  GSE securities $ 3,808 $ 17 $ 1 $ 3,824 
  Mortgage-backed securities issued by GSE    9,273   238   1   9,510 
  States and political subdivisions    34   1   1   34 
  Other securities    479   4   3   480 
   Total HTM securities $ 13,594 $ 260 $ 6 $ 13,848 
Gross Realized Gains and Losses
     Three Months Ended Nine Months Ended 
     September 30, September 30, 
      2013  2012  2013  2012 
                 
     (Dollars in millions) 
 Gross gains $ $ 1 $ 46 $ 1 
 Gross losses         (4) 
 Net realized gains (losses)$ $ 1 $ 46 $ (3) 
Schedule of the Changes in Credit Losses on Other-Than-Temporarily Impaired Non-Agency RMBSs where a Portion of Unrealized Loss was Recognized in OCI
     Three Months Ended Nine Months Ended 
     September 30, September 30, 
      2013  2012  2013  2012 
                 
     (Dollars in millions) 
 Balance at beginning of period$ 96 $ 113 $ 105 $ 130 
 Credit losses on securities with previously recognized OTTI    2     5 
 Reductions for securities sold/settled during the period  (3)   (4)   (12)   (24) 
 Balance at end of period$ 93 $ 111 $ 93 $ 111 
Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity
     AFS HTM 
     Amortized Fair Amortized Fair 
 September 30, 2013 Cost Value Cost Value 
                 
     (Dollars in millions) 
 Due in one year or less  $ 251 $ 251 $ $ 
 Due after one year through five years    432   440     
 Due after five years through ten years    572   595   5,213   4,901 
 Due after ten years    21,466   21,579   8,316   8,280 
  Total debt securities  $ 22,721 $ 22,865 $ 13,529 $ 13,181 
Gross Unrealized Losses and Fair Values of Investments by Investment Category and Length of Time in Unrealized Loss Position
      Less than 12 months 12 months or more Total 
      Fair Unrealized Fair Unrealized Fair Unrealized 
 September 30, 2013 Value Losses Value Losses Value Losses 
                        
      (Dollars in millions) 
 AFS securities:                   
  MBS issued by GSE $ 8,952 $ 343 $ 436 $ 26 $ 9,388 $ 369 
  States and political subdivisions    256   13   412   89   668   102 
  Non-agency MBS   46     81   5   127   5 
   Total $ 9,254 $ 356 $ 929 $ 120 $ 10,183 $ 476 

 HTM securities:                   
  GSE securities $ 4,822 $ 328 $ $ $ 4,822 $ 328 
  MBS issued by GSE   5,984   61   8     5,992   61 
  States and political subdivisions    20   1   2     22   1 
   Total $ 10,826 $ 390 $ 10 $ $ 10,836 $ 390 

      Less than 12 months 12 months or more Total 
      Fair Unrealized Fair Unrealized Fair Unrealized 
 December 31, 2012 Value Losses Value Losses Value Losses 
                        
      (Dollars in millions) 
 AFS securities:                   
  MBS issued by GSE $ 2,662 $ 18 $ $ $ 2,662 $ 18 
  States and political subdivisions    52   1   478   89   530   90 
  Non-agency MBS       113   11   113   11 
   Total $ 2,714 $ 19 $ 591 $ 100 $ 3,305 $ 119 

 HTM securities:                   
  GSE securities $ 805 $ 1 $ $ $ 805 $ 1 
  MBS issued by GSE   593   1       593   1 
  States and political subdivisions    22   1       22   1 
  Other securities    266   3       266   3 
   Total $ 1,686 $ 6 $ $ $ 1,686 $ 6