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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2012
Investment Securities Disclosure [Abstract]  
Investment Securities Summary
Note 8 Investment Securities  
                
Table 83: Investment Securities Summary 
                
    AmortizedUnrealized Fair 
In millions CostGainsLosses Value 
June 30, 2012             
                
Securities Available for Sale             
Debt securities             
 US Treasury and government agencies $ 2,642 $ 256    $ 2,898 
 Residential mortgage-backed             
  Agency   26,894   931 $ (11)   27,814 
  Non-agency   6,573   210   (896)   5,887 
 Commercial mortgage-backed             
  Agency   841   35      876 
  Non-agency   2,677   128   (3)   2,802 
 Asset-backed   5,539   30   (146)   5,423 
 State and municipal   1,982   94   (41)   2,035 
 Other debt   3,082   83   (4)   3,161 
  Total debt securities   50,230   1,767   (1,101)   50,896 
Corporate stocks and other   355         355 
 Total securities available for sale $ 50,585 $ 1,767 $ (1,101) $ 51,251 
Securities Held to Maturity             
Debt securities             
 US Treasury and government agencies $ 226 $ 50    $ 276 
 Residential mortgage-backed (agency)   4,154   170      4,324 
 Commercial mortgage-backed              
  Agency   1,296   71      1,367 
  Non-agency   3,005   98 $ (1)   3,102 
 Asset-backed   975   10   (1)   984 
 State and municipal   671   46      717 
 Other debt   359   17      376 
 Total securities held to maturity $ 10,686 $ 462 $ (2) $ 11,146 
                
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 
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 
June 30, 2012                   
Debt securities                   
 Residential mortgage-backed                   
  Agency $ (8) $ 934 $ (3) $ 158 $ (11) $ 1,092 
  Non-agency   (32)   276   (864)   4,344   (896)   4,620 
 Commercial mortgage-backed                   
  Non-agency   (1)   182   (2)   60   (3)   242 
 Asset-backed   (4)   1,044   (142)   698   (146)   1,742 
 State and municipal   (6)   423   (35)   362   (41)   785 
 Other debt   (2)   108   (2)   13   (4)   121 
   Total $ (53) $ 2,967 $ (1,048) $ 5,635 $ (1,101) $ 8,602 
                       
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- 
June 30, 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 1-49%  20% 
 Alt-A 3-62   34  
 Option ARM 15-74   55  
Loss severity         
 Prime 25-70%  48% 
 Alt-A 30-83   62  
 Option ARM 40-75   61  
(a) Collateralized by first-lien 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   
                  
  Three months ended June 30 Six months ended June 30  
In millions2012 2011   2012 2011  
Available for sale securities:                
 Non-agency residential mortgage-backed $(31) $ (35)   $(63) $ (63)  
 Asset-backed  (3)   (4)    (8)   (9)  
 Other debt          (1)   (1)  
Total $(34) $ (39)   $(72) $ (73)  
Summary of OTTI Noncredit Losses Recognized in Accumulated Other Comprehensive Loss
Table 87: Summary of OTTI Noncredit (Losses) Recoveries Included in Accumulated Other Comprehensive Loss  
                 
  Three months ended June 30 Six months ended June 30 
In millions2012 2011  2012 2011  
Total $2 $ (34)  $ 24 $ (30)  
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 
For the three months ended June 30, 2012                       
March 31, 2012 $ (859)   $ (6)   $ (249)   $ (14)  $ (1,128) 
Loss where impairment was not previously recognized   (1)                   (1) 
Additional loss where credit impairment was                        
 previously recognized   (30)          (3)         (33) 
June 30, 2012 $ (890)   $ (6)   $ (252)   $ (14)  $ (1,162) 
                         
  Non-agency Non-agency             
  residential commercial             
In millionsmortgage-backed mortgage-backed Asset-backed Other debt Total 
For the three months ended June 30, 2011                       
March 31, 2011 $ (737)   $ (6)   $ (228)   $ (13)  $ (984) 
Loss where impairment was not previously recognized             (3)         (3) 
Additional loss where credit impairment was                        
 previously recognized   (35)          (1)         (36) 
Reduction due to credit impaired securities sold   11                   11 
June 30, 2011 $ (761)   $ (6)   $ (232)   $ (13)  $ (1,012) 

  Non-agency Non-agency             
  residential commercial             
In millionsmortgage-backed mortgage-backed Asset-backed Other debt Total 
For the six months ended June 30, 2012                       
December 31, 2011 $ (828)   $ (6)   $ (244)   $ (13)  $ (1,091) 
Loss where impairment was not previously recognized   (2)               (1)    (3) 
Additional loss where credit impairment was previously recognized   (61)          (8)         (69) 
Reduction due to credit impaired securities sold   1                   1 
June 30, 2012 $ (890)   $(6)   $ (252)   $ (14)  $ (1,162) 
                         
  Non-agency Non-agency             
  residential commercial             
In millionsmortgage-backed mortgage-backed Asset-backed Other debt Total 
For the six months ended June 30, 2011                       
December 31, 2010 $ (709)   $ (11)   $ (223)   $ (12)  $ (955) 
Loss where impairment was not previously recognized   (3)          (3)     (1)    (7) 
Additional loss where credit impairment was previously recognized   (60)          (6)         (66) 
Reduction due to credit impaired securities sold   11     5              16 
June 30, 2011 $ (761)   $ (6)   $ (232)   $ (13)  $ (1,012) 
   
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 six months ended June 30                
2012 $ 6,607 $ 129 $ 10 $ 119 $ 42 
2011   15,436   267   148   119   42 
Contractual Maturity of Debt Securities
Table 90: Contractual Maturity of Debt Securities
                      
June 30, 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  $ 951  $ 1,241  $ 448  $ 2,642 
Residential mortgage-backed                    
 Agency       29    757    26,108    26,894 
 Non-agency           23    6,550    6,573 
Commercial mortgage-backed                    
 Agency   2    684    144    11    841 
 Non-agency   4    174    49    2,450    2,677 
Asset-backed       1,256    1,512    2,771    5,539 
State and municipal   24    55    323    1,580    1,982 
Other debt   447    1,577    627    431    3,082 
 Total debt securities available for sale $ 479  $ 4,726  $ 4,676  $ 40,349  $ 50,230 
Fair value $ 485  $ 4,856  $ 4,888  $ 40,667  $ 50,896 
Weighted-average yield, GAAP basis   2.86%   2.44%   2.75%   3.51%   3.33%
Securities Held to Maturity                    
US Treasury and government agencies             $ 226  $ 226 
Residential mortgage-backed (agency)               4,154    4,154 
Commercial mortgage-backed                    
 Agency     $ 205  $ 1,086    5    1,296 
 Non-agency $ 16    57        2,932    3,005 
Asset-backed   6    424    82    463    975 
State and municipal   32    25    153    461    671 
Other debt       2    357        359 
Total debt securities held to maturity $ 54  $ 713  $ 1,678  $ 8,241  $ 10,686 
Fair value $ 55  $ 729  $ 1,770  $ 8,592  $ 11,146 
Weighted-average yield, GAAP basis   2.43%   3.21%   3.33%   4.22%   4.00%
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 
     
 June 30, 
 2012 
Agency residential mortgage-backed securities  3.4years 
Non-agency residential mortgage-backed securities  4.8years 
Agency commercial mortgage-backed securities  4.9years 
Non-agency commercial mortgage-backed securities  2.6years 
Asset-backed securities  3.5years 
Fair Value of Securities Pledged and Accepted as Collateral
Table 92: Fair Value of Securities Pledged and Accepted as Collateral     
           
   June 30 December 31 
In millions 2012 2011 
Pledged to others  $ 22,282  $ 20,109 
Accepted from others:         
 Permitted by contract or custom to sell or repledge    1,372    1,796 
 Permitted amount repledged to others    618    892