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Investment Securities (Tables)
12 Months Ended
Dec. 31, 2012
Investment Securities Disclosure [Abstract]  
Investment Securities Summary
Note 8 Investment Securities  
                
Table 83: Investment Securities Summary 
                
    AmortizedUnrealized Fair 
In millions CostGainsLosses Value 
December 31, 2012             
                
Securities Available for Sale             
Debt securities             
 US Treasury and government agencies $ 2,868 $ 245    $ 3,113 
 Residential mortgage-backed             
  Agency   25,844   952 $ (12)   26,784 
  Non-agency   6,102   314   (309)   6,107 
 Commercial mortgage-backed             
  Agency   602   31      633 
  Non-agency   3,055   210   (1)   3,264 
 Asset-backed   5,667   65   (79)   5,653 
 State and municipal   2,197   111   (21)   2,287 
 Other debt   2,745   103   (4)   2,844 
  Total debt securities   49,080   2,031   (426)   50,685 
Corporate stocks and other   367         367 
 Total securities available for sale $ 49,447 $ 2,031 $ (426) $ 51,052 
Securities Held to Maturity             
Debt securities             
 US Treasury and government agencies $ 230 $ 47    $ 277 
 Residential mortgage-backed (agency)   4,380   202      4,582 
 Commercial mortgage-backed              
  Agency   1,287   87      1,374 
  Non-agency   2,582   85      2,667 
 Asset-backed   858   5      863 
 State and municipal   664   61      725 
 Other debt   353   19      372 
 Total securities held to maturity $ 10,354 $ 506    $ 10,860 
                
December 31, 2011             
                
Securities Available for Sale             
Debt securities             
 US Treasury and government agencies $ 3,369 $ 348    $ 3,717 
 Residential mortgage-backed             
  Agency   26,081   772 $ (61)   26,792 
  Non-agency   6,673   152   (1,268)   5,557 
 Commercial mortgage-backed             
  Agency   1,101   39      1,140 
  Non-agency   2,693   80   (17)   2,756 
 Asset-backed   3,854   31   (216)   3,669 
 State and municipal   1,779   75   (47)   1,807 
 Other debt   2,691   83   (12)   2,762 
  Total debt securities   48,241   1,580   (1,621)   48,200 
Corporate stocks and other   368         368 
 Total securities available for sale $ 48,609 $ 1,580 $ (1,621) $ 48,568 
Securities Held to Maturity             
Debt securities             
 US Treasury and government agencies $ 221 $ 40    $ 261 
 Residential mortgage-backed (agency)   4,761   131 $ (1)   4,891 
 Commercial mortgage-backed             
  Agency   1,332   50      1,382 
  Non-agency   3,467   108   (2)   3,573 
 Asset-backed   1,251   14   (3)   1,262 
 State and municipal   671   31      702 
 Other debt   363   16      379 
 Total securities held to maturity $ 12,066 $ 390 $ (6) $ 12,450 
                
                
December 31, 2010             
                
Securities Available for Sale             
Debt securities             
 US Treasury and government agencies $ 5,575 $ 157 $ (22) $ 5,710 
 Residential mortgage-backed             
  Agency   31,697   443   (420)   31,720 
  Non-agency   8,193   230   (1,190)   7,233 
 Commercial mortgage-backed             
  Agency   1,763   40   (6)   1,797 
  Non-agency   1,794   73   (11)   1,856 
 Asset-backed   2,780   40   (238)   2,582 
 State and municipal   1,999   30   (72)   1,957 
 Other debt   3,992   102   (17)   4,077 
  Total debt securities   57,793   1,115   (1,976)   56,932 
Corporate stocks and other   378         378 
 Total securities available for sale $ 58,171 $ 1,115 $ (1,976) $ 57,310 
Securities Held to Maturity             
Debt securities             
 Commercial mortgage-backed (non-agency) $ 4,316 $ 178 $ (4) $ 4,490 
 Asset-backed   2,626   51   (1)   2,676 
 Other debt   10   1      11 
 Total securities held to maturity $ 6,952 $ 230 $ (5) $ 7,177 
Gross Unrealized Loss and Fair Value of Securities Available for Sale
Table 84: Gross Unrealized Loss and Fair Value of Securities Available for Sale 
                       
    Unrealized loss position lessUnrealized loss position 12      
In millionsthan 12 monthsmonths or moreTotal 
    Unrealized Fair Unrealized Fair Unrealized Fair 
    Loss Value Loss Value Loss Value 
December 31, 2012                   
Debt securities                   
 Residential mortgage-backed                   
  Agency $ (9) $ 1,128 $ (3) $ 121 $ (12) $ 1,249 
  Non-agency   (3)   219   (306)   3,185   (309)   3,404 
 Commercial mortgage-backed                   
  Agency                   
  Non-agency   (1)   60         (1)   60 
 Asset-backed   (1)   370   (78)   625   (79)   995 
 State and municipal   (2)   240   (19)   518   (21)   758 
 Other debt   (2)   61   (2)   15   (4)   76 
   Total $ (18) $ 2,078 $ (408) $ 4,464 $ (426) $ 6,542 
                       
December 31, 2011                   
Debt securities                   
 Residential mortgage-backed                   
  Agency $ (24) $ 2,165 $ (37) $ 408 $ (61) $ 2,573 
  Non-agency   (26)   273   (1,242)   4,378   (1,268)   4,651 
 Commercial mortgage-backed                   
  Non-agency   (17)   483         (17)   483 
 Asset-backed   (13)   1,355   (203)   764   (216)   2,119 
 State and municipal   (6)   512   (41)   318   (47)   830 
 Other debt   (5)   240   (7)   289   (12)   529 
   Total $ (91) $ 5,028 $ (1,530) $ 6,157 $ (1,621) $ 11,185 
Credit Impairment Assessment Assumptions - Non Agency Residential Mortgage-Backed and Asset-Backed Securities
Table 85: Credit Impairment Assessment Assumptions - Non-Agency Residential Mortgage-Backed and Asset-Backed Securities (a)
           
   Weighted- 
December 31, 2012Range average (b) 
Long-term prepayment rate (annual CPR)        
 Prime 7-20%  14%
 Alt-A 5-12   6 
 Option ARM 3-6   3 
Remaining collateral expected to default        
 Prime 0-51%  19%
 Alt-A 2-61   33 
 Option ARM 19-73   52 
Loss severity        
 Prime 25-72%  46%
 Alt-A 30-85   60 
 Option ARM 40-70   60 
(a) Collateralized by first and second-lien non-agency residential mortgage loans.
(b) Calculated by weighting the relevant assumption for each individual security by the current outstanding cost basis of the security.
Summary of OTTI Credit Losses Recognized in Earnings
Table 86: Summary of OTTI Credit Losses Recognized in Earnings
   
Year ended December 31       
In millions20122011 
Available for sale securities:       
 Non-agency residential mortgage-backed $ (99) $ (130) 
 Asset-backed   (11)   (21) 
 Other debt   (1)   (1) 
Total $ (111) $ (152) 
Summary of OTTI Noncredit (Losses) Recoveries Recognized in Accumulated Other Comprehensive Income (Loss)
Table 87: Summary of OTTI Noncredit (Losses) Recoveries Included in Accumulated Other Comprehensive Income (Loss) 
          
    
In millions 2012 2011  
Total $ 32 $ (268)  
Rollforward of Cumulative OTTI Credit Losses Recognized in Earnings
Table 88: Rollforward of Cumulative OTTI Credit Losses Recognized in Earnings
                         
  Non-agency Non-agency             
  residential commercial             
In millionsmortgage-backed mortgage-backed Asset-backed Other debt Total 
December 31, 2010 $ (709)   $ (11)   $ (223)   $ (12)  $ (955) 
Loss where impairment was not previously recognized   (18)          (3)     (1)    (22) 
Additional loss where credit impairment was previously recognized   (112)          (18)         (130) 
Reduction due to credit impaired securities sold   11    5              16 
December 31, 2011   (828)    (6)     (244)     (13)    (1,091) 
Loss where impairment was not previously recognized   (9)               (1)    (10) 
Additional loss where credit impairment was previously recognized   (90)          (11)         (101) 
Reduction due to credit impaired securities sold   1                   1 
December 31, 2012 $ (926)   $ (6)   $ (255)   $ (14)  $ (1,201) 
Gains (Losses) on Sales Of Securities Available for Sale
Table 89: Gains (Losses) on Sales of Securities Available for Sale                
                 
     Gross Gross Net Tax 
In millions Proceeds Gains Losses Gains Expense 
For the year ended December 31                
2012 $ 9,441 $ 214 $ (10) $ 204 $ 71 
2011   21,039   406   (157)   249   87 
2010   23,783   490   (64)   426   149 
Contractual Maturity of Debt Securities
Table 90: Contractual Maturity of Debt Securities
                      
December 31, 2012   After 1 Year After 5 Years After 10    
Dollars in millions 1 Year or Less through 5 Years through 10 Years Years Total 
Securities Available for Sale                    
US Treasury and government agencies $ 2  $ 1,096  $ 1,321  $ 449  $ 2,868 
Residential mortgage-backed                    
 Agency       22    488    25,334    25,844 
 Non-agency       2    17    6,083    6,102 
Commercial mortgage-backed                    
 Agency   1    550    51        602 
 Non-agency       174    106    2,775    3,055 
Asset-backed       1,063    1,511    3,093    5,667 
State and municipal   24    51    447    1,675    2,197 
Other debt   390    1,389    575    391    2,745 
 Total debt securities available for sale $ 417  $ 4,347  $ 4,516  $ 39,800  $ 49,080 
Fair value $ 420  $ 4,490  $ 4,729  $ 41,046  $ 50,685 
Weighted-average yield, GAAP basis   2.83%   2.57%   2.44%   3.37%   3.21%
Securities Held to Maturity                    
US Treasury and government agencies             $230  $ 230 
Residential mortgage-backed (agency)               4,380    4,380 
Commercial mortgage-backed                    
 Agency     $318  $ 964    5    1,287 
 Non-agency $1   53        2,528    2,582 
Asset-backed       124    64    670    858 
State and municipal   25    25    279    335    664 
Other debt       1    352        353 
Total debt securities held to maturity $ 26  $ 521  $ 1,659  $ 8,148  $ 10,354 
Fair value $ 26  $ 538  $ 1,777  $ 8,519  $ 10,860 
Weighted-average yield, GAAP basis   1.73%   3.39%   3.44%   4.03%   3.90%
Weighted-Average Expected Maturity of Mortgage and Other Asset-Backed Debt Securities
Table 91: Weighted-Average Expected Maturity of Mortgage and Other Asset-Backed Debt Securities
    
 December 31
 2012
Agency residential mortgage-backed securities  3.3years
Non-agency residential mortgage-backed securities  5.4years
Agency commercial mortgage-backed securities  4.7years
Non-agency commercial mortgage-backed securities  2.6years
Asset-backed securities  4.1years
Fair Value of Securities Pledged and Accepted as Collateral
Table 92: Fair Value of Securities Pledged and Accepted as Collateral     
           
   December 31 December 31 
In millions 2012 2011 
Pledged to others  $ 25,648  $ 20,109 
Accepted from others:         
 Permitted by contract or custom to sell or repledge    1,015    1,796 
 Permitted amount repledged to others    685    892