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Investment Securities (Tables)
9 Months Ended
Sep. 30, 2011
Investment Securities [Abstract] 
Investment Securities held to maturity and Available for sale
 
 
                                                                               
    September 30, 2011       December 31, 2010  
                Unrealized Losses                         Unrealized Losses        
    Amortized
    Unrealized
    Other-than-
        Fair
      Amortized
    Unrealized
    Other-than-
        Fair
 
(Dollars in Millions)   Cost     Gains     Temporary (d)   Other (e)     Value       Cost     Gains     Temporary (d)   Other (e)     Value  
Held-to-maturity (a)
                                                                             
U.S. Treasury and agencies
  $ 2,623     $ 36     $   $     $ 2,659       $ 165     $     $   $ (1 )   $ 164  
Mortgage-backed securities
                                                                             
Residential
                                                                             
Agency
    13,400       339           (4 )     13,735         847                 (4 )     843  
Non-agency non-prime
    2                 (1 )     1         3                       3  
Commercial non-agency
    5                 (2 )     3         10                 (5 )     5  
Asset-backed securities
                                                                             
Collateralized debt obligations/Collaterized loan obligations
    60       13           (3 )     70         157       13           (18 )     152  
Other
    24       1           (7 )     18         127             (1)     (7 )     119  
Obligations of state and political subdivisions
    24       1           (1 )     24         27       1           (1 )     27  
Obligations of foreign governments
    7                       7         7                       7  
Other debt securities
    124                 (28 )     96         126                 (27 )     99  
                                                                               
Total held-to-maturity
  $ 16,269     $ 390     $   $ (46 )   $ 16,613       $ 1,469     $ 14     $ (1)   $ (63 )   $ 1,419  
                                                                               
Available-for-sale (b)
                                                                             
U.S. Treasury and agencies
  $ 1,477     $ 12     $   $     $ 1,489       $ 2,559     $ 6     $   $ (28 )   $ 2,537  
Mortgage-backed securities
                                                                             
Residential
                                                                             
Agency
    38,767       992           (21 )     39,738         37,144       718           (159 )     37,703  
Non-agency
                                                                             
Prime (c)
    950       6       (48)     (49 )     859         1,216       12       (86)     (39 )     1,103  
Non-prime
    1,076       17       (224)     (12 )     857         1,193       15       (243)     (18 )     947  
Commercial
                                                                             
Agency
    140       7                 147         194       5           (2 )     197  
Non-agency
    43       2                 45         47       3                 50  
Asset-backed securities
                                                                             
Collateralized debt obligations/Collaterized loan obligations
    189       34       (2)     (3 )     218         204       23       (2)     (1 )     224  
Other
    693       19       (3)     (23 )     686         709       23       (3)     (9 )     720  
Obligations of state and political subdivisions
    6,409       130           (40 )     6,499         6,835       3           (421 )     6,417  
Obligations of foreign governments
    6                       6         6                       6  
Corporate debt securities
    1,109                 (140 )     969         1,109                 (151 )     958  
Perpetual preferred securities
    455       31           (80 )     406         456       41           (49 )     448  
Other investments
    178       13           (1 )     190         183       17           (1 )     199  
                                                                               
Total available-for-sale
  $ 51,492     $ 1,263     $ (277)   $ (369 )   $ 52,109       $ 51,855     $ 866     $ (334)   $ (878 )   $ 51,509  
                                                                               
 
(a) Held-to-maturity securities are carried at historical cost adjusted for amortization of premiums and accretion of discounts and credit-related other-than-temporary impairment.
(b) Available-for-sale securities are carried at fair value with unrealized net gains or losses reported within accumulated other comprehensive income (loss) in shareholders’ equity.
(c) Prime securities are those designated as such by the issuer or those with underlying asset characteristics and/or credit enhancements consistent with securities designated as prime.
(d) Represents impairment not related to credit for those securities that have been determined to be other-than-temporarily impaired.
(e) Represents unrealized losses on securities that have not been determined to be other-than-temporarily impaired.
Amount of interest income from taxable and nontaxable investment securities
                                   
    Three Months Ended
      Nine Months Ended
 
    September 30,       September 30,  
(Dollars in Millions)   2011     2010       2011     2010  
Taxable
  $ 394     $ 323       $ 1,127     $ 973  
Non-taxable
    76       77         230       231  
                                   
Total interest income from investment securities
  $ 470     $ 400       $ 1,357     $ 1,204  
                                   
Amount of gross gains and losses realized through sales of available for sale investment securities
                                   
    Three Months Ended
      Nine Months Ended
 
    September 30,       September 30,  
(Dollars in Millions)   2011     2010       2011     2010  
Realized gains
  $ 4     $ 9       $ 6     $ 21  
Realized losses
    (4 )             (4 )      
                                   
Net realized gains (losses)
  $     $ 9       $ 2     $ 21  
                                   
Income tax (benefit) on realized gains (losses)
  $     $ 4       $ 1     $ 8  
                                   
Accretable balance of structured investment securities and other investment securities
                                   
    Three Months Ended
      Nine Months Ended
 
    September 30,       September 30,  
(Dollars in Millions)   2011     2010       2011     2010  
Balance at beginning of period
  $ 117     $ 302       $ 139     $ 292  
Additions (a)
          66               66  
Disposals (a)
          (50 )             (50 )
Accretion
    (4 )     (8 )       (13 )     (23 )
Other (b)
    (6 )     (1 )       (19 )     24  
                                   
Balance at end of period
  $ 107     $ 309       $ 107     $ 309  
                                   
(a) Additions and disposals resulted from the exchange of certain SIV’s for the underlying investment securities.
(b) Primarily represents changes in projected future cash flows related to variable rates on certain investment securities.
Summary of other than temporary impairment by investment category
                                                   
    2011       2010  
    Losses
                  Losses
             
Three Months Ended September 30
  Recorded in
    Other Gains
            Recorded in
    Other Gains
       
(Dollars in Millions)   Earnings     (Losses) (b)     Total       Earnings     (Losses) (b)     Total  
Held-to-maturity
                                                 
Asset-backed securities
                                                 
Other
  $     $     $       $     $     $  
                                                   
Total held-to-maturity
  $     $     $       $     $     $  
                                                   
Available-for-sale
                                                 
Mortgage-backed securities
                                                 
Non-agency residential
                                                 
Prime (a)
  $     $     $       $ (1 )   $ (1 )   $ (2 )
Non-prime
    (6 )     (4 )     (10 )       (13 )     (11 )     (24 )
Asset-backed securities
                                                 
Collateralized debt obligations/Collaterized loan obligations
                        (1 )           (1 )
Other
    (3 )     2       (1 )       (2 )     2        
Perpetual preferred securities
                        (1 )           (1 )
                                                   
Total available-for-sale
  $ (9 )   $ (2 )   $ (11 )     $ (18 )   $ (10 )   $ (28 )
                                                   
(a) Prime securities are those designated as such by the issuer or those with underlying asset characteristics and/or credit enhancements consistent with securities designated as prime.
(b) Represents the non-credit portion of other-than-temporary impairment recorded in other comprehensive income for securities determined to be other-than-temporarily impaired during the period.
 
                                                   
    2011       2010  
    Losses
                  Losses
             
Nine Months Ended September 30
  Recorded in
    Other Gains
            Recorded in
    Other Gains
       
(Dollars in Millions)   Earnings     (Losses) (b)     Total       Earnings     (Losses) (b)     Total  
Held-to-maturity
                                                 
Asset-backed securities
                                                 
Other
  $     $     $       $ (2 )   $     $ (2 )
                                                   
Total held-to-maturity
  $     $     $       $ (2 )   $     $ (2 )
                                                   
Available-for-sale
                                                 
Mortgage-backed securities
                                                 
Non-agency residential
                                                 
Prime (a)
  $ (2 )   $ (3 )   $ (5 )     $ (4 )   $ (11 )   $ (15 )
Non-prime
    (18 )     (16 )     (34 )       (59 )     (54 )     (113 )
Asset-backed securities
                                                 
Collateralized debt obligations/Collaterized loan obligations
                        (6 )           (6 )
Other
    (4 )     2       (2 )       (12 )     4       (8 )
Perpetual preferred securities
                        (1 )           (1 )
Other debt securities
                        (1 )     1        
                                                   
Total available-for-sale
  $ (24 )   $ (17 )   $ (41 )     $ (83 )   $ (60 )   $ (143 )
                                                   
(a) Prime securities are those designated as such by the issuer or those with underlying asset characteristics and/or credit enhancements consistent with securities designated as prime.
(b) Represents the non-credit portion of other-than-temporary impairment recorded in other comprehensive income for securities determined to be other-than-temporarily impaired during the period.
 
Summary of ranges used in valuation of non-agency mortgage-backed securities other than temporarily impaired
 
                                                   
    Prime       Non-Prime  
    Minimum     Maximum     Average       Minimum     Maximum     Average  
September 30, 2011
                                                 
Estimated lifetime prepayment rates
    7 %     15 %     13 %       1 %     11 %     6 %
Lifetime probability of default rates
    2       7       3         1       19       6  
Lifetime loss severity rates
    40       55       46         8       70       53  
December 31, 2010
                                                 
Estimated lifetime prepayment rates
    4 %     14 %     13 %       1 %     12 %     6 %
Lifetime probability of default rates
    3       9       3         1       20       8  
Lifetime loss severity rates
    40       55       41         37       71       55  
                                                   
Credit losses on non-agency mortgage backed and other debt securities
                                   
    Three Months Ended
      Nine Months Ended
 
    September 30,       September 30,  
(Dollars in Millions)   2011     2010       2011     2010  
Balance at beginning of period
  $ 319     $ 382       $ 358     $ 335  
Additions to credit losses due to other-than-temporary impairments
                                 
Credit losses on securities not previously considered other-than-temporarily impaired
    1       3         3       18  
Decreases in expected cash flows on securities for which other-than-temporary impairment was previously recognized
    8       15         21       67  
                                   
Total other-than-temporary impairment on debt securities
    9       18         24       85  
Other changes in credit losses
                                 
Increases in expected cash flows
    (3 )     (4 )       (20 )     (17 )
Realized losses (a)
    (19 )     (19 )       (55 )     (44 )
Credit losses on security sales and securities expected to be sold
                  (1 )      
Other
                        18  
                                   
Balance at end of period
  $ 306     $ 377       $ 306     $ 377  
                                   
(a) Primarily represents principal losses allocated to mortgage and asset-backed securities in the Company’s portfolio under the terms of the securitization transaction documents.
Gross unrealized losses and fair value of the Company's investments with unrealized losses
                                                     
    Less Than 12 Months       12 Months or Greater       Total  
    Fair
    Unrealized
      Fair
    Unrealized
      Fair
    Unrealized
 
(Dollars in Millions)   Value     Losses       Value     Losses       Value     Losses  
Held-to-maturity
                                                   
Mortgage-backed securities
                                                   
Residential
                                                   
Agency
  $ 1,769     $ (4 )     $     $       $ 1,769     $ (4 )
Non-agency non-prime (a)
                  1       (1 )       1       (1 )
Commercial non-agency
                  3       (2 )       3       (2 )
Asset-backed securities
                                                   
Collateralized debt obligations/Collaterized loan obligations
                  31       (3 )       31       (3 )
Other
                  15       (7 )       15       (7 )
Obligations of state and political subdivisions
                  9       (1 )       9       (1 )
Other debt securities
                  96       (28 )       96       (28 )
                                                     
Total held-to-maturity
  $ 1,769     $ (4 )     $ 155     $ (42 )     $ 1,924     $ (46 )
                                                     
Available-for-sale
                                                   
U.S. Treasury and agencies
  $ 208     $       $     $       $ 208     $  
Mortgage-backed securities
                                                   
Residential
                                                   
Agency
    10,936       (21 )       141               11,077       (21 )
Non-agency (a)
                                                   
Prime (b)
    103       (4 )       689       (93 )       792       (97 )
Non-prime
    59       (6 )       699       (230 )       758       (236 )
Commercial non-agency
    22                             22        
Asset-backed securities
                                                   
Collateralized debt obligations/Collaterized loan obligations
    16       (3 )       7       (2 )       23       (5 )
Other
    460       (12 )       117       (14 )       577       (26 )
Obligations of state and political subdivisions
    457       (3 )       1,087       (37 )       1,544       (40 )
Corporate debt securities
    186       (4 )       641       (136 )       827       (140 )
Perpetual preferred securities
    61       (14 )       231       (66 )       292       (80 )
Other investments
    1               3       (1 )       4       (1 )
                                                     
Total available-for-sale
  $ 12,509     $ (67 )     $ 3,615     $ (579 )     $ 16,124     $ (646 )
                                                     
(a) The Company has $334 million of unrealized losses on residential non-agency mortgage-backed securities. Credit-related other-than-temporary impairment on these securities may occur if there is further deterioration in underlying collateral pool performance. Borrower defaults may increase if current economic conditions persist or worsen. Additionally, further deterioration in home prices may increase the severity of projected losses.
(b) Prime securities are those designated as such by the issuer or those with underlying asset characteristics and/or credit enhanacements consistent with securities designated as prime.
Investment Securities
                                                                   
    Available-for-Sale       Held-to-Maturity  
                Weighted-
                        Weighted-
       
                Average
    Weighted-
                  Average
    Weighted-
 
    Amortized
    Fair
    Maturity in
    Average
      Amortized
    Fair
    Maturity in
    Average
 
September 30, 2011 (Dollars in Millions)   Cost     Value     Years     Yield (e)       Cost     Value     Years     Yield (e)  
U.S. Treasury and Agencies
                                                                 
Maturing in one year or less
  $ 852     $ 853       .3       1.73 %     $     $             %
Maturing after one year through five years
    556       562       2.2       .92         2,501       2,537       2.4       .99  
Maturing after five years through ten years
    49       53       8.5       4.24                            
Maturing after ten years
    20       21       11.8       3.42         122       122       12.0       1.74  
                                                                   
Total
  $ 1,477     $ 1,489       1.4       1.53 %     $ 2,623     $ 2,659       2.9       1.02 %
                                                                   
Mortgage-Backed Securities (a)
                                                                 
Maturing in one year or less
  $ 679     $ 680       .6       2.53 %     $ 200     $ 198       .7       1.48 %
Maturing after one year through five years
    30,646       31,508       3.4       2.92         10,884       11,168       3.6       2.57  
Maturing after five years through ten years
    7,863       7,730       6.6       2.02         1,801       1,843       5.5       2.07  
Maturing after ten years
    1,788       1,728       12.3       1.69         522       530       11.9       1.42  
                                                                   
Total
  $ 40,976     $ 41,646       4.4       2.69 %     $ 13,407     $ 13,739       4.2       2.44 %
                                                                   
Asset-Backed Securities (a)
                                                                 
Maturing in one year or less
  $ 6     $ 15       .5       13.56 %     $ 2     $ 2       .3       1.01 %
Maturing after one year through five years
    179       185       3.5       13.01         44       44       2.9       .95  
Maturing after five years through ten years
    689       695       8.0       2.81         14       17       6.3       .87  
Maturing after ten years
    8       9       15.9       7.80         24       25       23.0       .82  
                                                                   
Total
  $ 882     $ 904       7.1       5.01 %     $ 84     $ 88       9.1       .90 %
                                                                   
Obligations of State and Political Subdivisions (b)(c)
                                                                 
Maturing in one year or less
  $ 16     $ 16       .4       6.08 %     $     $       .5       7.62 %
Maturing after one year through five years
    3,083       3,145       4.1       6.59         5       6       3.3       8.38  
Maturing after five years through ten years
    2,888       2,946       5.7       6.79         4       4       6.0       5.38  
Maturing after ten years
    422       392       20.4       7.19         15       14       15.4       5.53  
                                                                   
Total
  $ 6,409     $ 6,499       5.9       6.72 %     $ 24     $ 24       11.2       6.17 %
                                                                   
Other Debt Securities
                                                                 
Maturing in one year or less
  $ 122     $ 112       .4       6.24 %     $ 1     $ 1       .5       .84 %
Maturing after one year through five years
                              12       10       2.0       1.29  
Maturing after five years through ten years
    31       28       6.0       6.33         118       92       7.0       1.17  
Maturing after ten years
    1,282       1,091       30.3       4.07                            
                                                                   
Total
  $ 1,435     $ 1,231       27.2       4.30 %     $ 131     $ 103       6.5       1.18 %
                                                                   
Other Investments
  $ 313     $ 340       17.3       3.99 %     $     $             %
                                                                   
Total investment securities (d)
  $ 51,492     $ 52,109       5.3       3.25 %     $ 16,269     $ 16,613       4.0       2.20 %
                                                                   
(a) Information related to asset and mortgage-backed securities included above is presented based upon weighted-average maturities anticipating future prepayments.
(b) Information related to obligations of state and political subdivisions is presented based upon yield to first optional call date if the security is purchased at a premium, yield to maturity if purchased at par or a discount.
(c) Maturity calculations for obligations of state and politicial subdivisions are based on the first optional call date for securities with a fair value above par and contractual maturity for securities with a fair value equal to or below par.
(d) The weighted-average maturity of the available-for-sale investment securities was 7.4 years at December 31, 2010, with a corresponding weighted-average yield of 3.41 percent. The weighted-average maturity of the held-to-maturity investment securities was 6.3 years at December 31, 2010, with a corresponding weighted-average yield of 2.07 percent.
(e) Average yields are presented on a fully-taxable equivalent basis under a tax rate of 35 percent. Yields on available-for-sale and held-to-maturity securities are computed based on historical cost balances. Average yield and maturity calculations exclude equity securities that have no stated yield or maturity.
 
                                   
    September 30, 2011       December 31, 2010  
    Amortized
    Percent
      Amortized
    Percent
 
(Dollars in Millions)   Cost     of Total       Cost     of Total  
U.S. Treasury and agencies
  $ 4,100       6.1 %     $ 2,724       5.1 %
Mortgage-backed securities
    54,383       80.2         40,654       76.2  
Asset-backed securities
    966       1.4         1,197       2.3  
Obligations of state and political subdivisions
    6,433       9.5         6,862       12.9  
Other debt securities and investments
    1,879       2.8         1,887       3.5  
                                   
Total investment securities
  $ 67,761       100.0 %     $ 53,324       100.0 %