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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2012
Investment Securities Disclosure [Abstract]  
Investment Securities Summary
Note 8 Investment Securities  
                
Table 83: Investment Securities Summary 
                
    AmortizedUnrealized Fair 
In millions CostGainsLosses Value 
September 30, 2012             
                
Securities Available for Sale             
Debt securities             
 US Treasury and government agencies $ 2,773 $ 251    $ 3,024 
 Residential mortgage-backed             
  Agency   26,850   1,087 $ (7)   27,930 
  Non-agency   6,313   308   (401)   6,220 
 Commercial mortgage-backed             
  Agency   616   35      651 
  Non-agency   3,088   195   (2)   3,281 
 Asset-backed   5,588   49   (98)   5,539 
 State and municipal   1,970   114   (35)   2,049 
 Other debt   3,015   108   (5)   3,118 
  Total debt securities   50,213   2,147   (548)   51,812 
Corporate stocks and other   321         321 
 Total securities available for sale $ 50,534 $ 2,147 $ (548) $ 52,133 
Securities Held to Maturity             
Debt securities             
 US Treasury and government agencies $ 228 $ 50    $ 278 
 Residential mortgage-backed (agency)   4,578   222      4,800 
 Commercial mortgage-backed              
  Agency   1,292   88      1,380 
  Non-agency   2,784   109      2,893 
 Asset-backed   772   5 $ (2)   775 
 State and municipal   671   58      729 
 Other debt   356   21      377 
 Total securities held to maturity $ 10,681 $ 553 $ (2) $ 11,232 
                
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 
September 30, 2012                   
Debt securities                   
 Residential mortgage-backed                   
  Agency $ (4) $ 652 $ (3) $ 134 $ (7) $ 786 
  Non-agency   (3)   58   (398)   3,878   (401)   3,936 
 Commercial mortgage-backed                   
  Non-agency   (1)   88   (1)   28   (2)   116 
 Asset-backed   (3)   676   (95)   757   (98)   1,433 
 State and municipal   (1)   142   (34)   564   (35)   706 
 Other debt   (3)   79   (2)   13   (5)   92 
   Total $ (15) $ 1,695 $ (533) $ 5,374 $ (548) $ 7,069 
                       
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- 
September 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 0-51%  20% 
 Alt-A 3-60   33  
 Option ARM 15-77   53  
Loss severity         
 Prime 25-80%  48% 
 Alt-A 30-90   60  
 Option ARM 40-70   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 September 30 Nine months ended September 30  
In millions2012 2011   2012 2011  
Available for sale securities:                
 Non-agency residential mortgage-backed $(23) $ (30)   $(86) $ (93)  
 Asset-backed  (1)   (5)    (9)   (14)  
 Other debt          (1)   (1)  
Total $(24) $ (35)   $(96) $ (108)  
Summary of OTTI Noncredit Losses Recognized in Accumulated Other Comprehensive Loss
Table 87: Summary of OTTI Noncredit (Losses) Recoveries Included in Accumulated Other Comprehensive Income (Loss)  
                 
  Three months ended September 30 Nine months ended September 30 
In millions2012 2011  2012 2011  
Total $(2) $ (87)  $ 22 $ (117)  
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 September 30, 2012                       
June 30, 2012 $ (890)   $ (6)   $ (252)   $ (14)  $ (1,162) 
Loss where impairment was not previously recognized   (6)                   (6) 
Additional loss where credit impairment was                        
 previously recognized   (17)          (1)         (18) 
September 30, 2012 $ (913)   $ (6)   $ (253)   $ (14)  $ (1,186) 
                         
  Non-agency Non-agency             
  residential commercial             
In millionsmortgage-backed mortgage-backed Asset-backed Other debt Total 
For the three months ended September 30, 2011                       
June 30, 2011 $ (761)   $ (6)   $ (232)   $ (13)  $ (1,012) 
Loss where impairment was not previously recognized   (2)                   (2) 
Additional loss where credit impairment was                        
 previously recognized   (28)          (5)         (33) 
September 30, 2011 $ (791)   $ (6)   $ (237)   $ (13)  $ (1,047) 

  Non-agency Non-agency             
  residential commercial             
In millionsmortgage-backed mortgage-backed Asset-backed Other debt Total 
For the nine months ended September 30, 2012                       
December 31, 2011 $ (828)   $ (6)   $ (244)   $ (13)  $ (1,091) 
Loss where impairment was not previously recognized   (8)               (1)    (9) 
Additional loss where credit impairment was previously recognized   (78)          (9)         (87) 
Reduction due to credit impaired securities sold   1                   1 
September 30, 2012 $ (913)   $(6)   $ (253)   $ (14)  $ (1,186) 
                         
  Non-agency Non-agency             
  residential commercial             
In millionsmortgage-backed mortgage-backed Asset-backed Other debt Total 
For the nine months ended September 30, 2011                       
December 31, 2010 $ (709)   $ (11)   $ (223)   $ (12)  $ (955) 
Loss where impairment was not previously recognized   (5)          (3)     (1)    (9) 
Additional loss where credit impairment was previously recognized   (88)          (11)         (99) 
Reduction due to credit impaired securities sold   11     5              16 
September 30, 2011 $ (791)   $ (6)   $ (237)   $ (13)  $ (1,047) 
   
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 nine months ended September 30                
2012 $ 8,553 $ 169 $ (10) $ 159 $ 56 
2011   17,564   336   (149)   187   66 
Contractual Maturity of Debt Securities
Table 90: Contractual Maturity of Debt Securities
                      
September 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  $ 957  $ 1,362  $ 452  $ 2,773 
Residential mortgage-backed                    
 Agency       13    705    26,132    26,850 
 Non-agency       2    19    6,292    6,313 
Commercial mortgage-backed                    
 Agency   1    563    52        616 
 Non-agency   2    174    58    2,854    3,088 
Asset-backed       1,228    1,452    2,908    5,588 
State and municipal   22    50    318    1,580    1,970 
Other debt   539    1,426    637    413    3,015 
 Total debt securities available for sale $ 566  $ 4,413  $ 4,603  $ 40,631  $ 50,213 
Fair value $ 571  $ 4,557  $ 4,833  $ 41,851  $ 51,812 
Weighted-average yield, GAAP basis   2.60%   2.47%   2.73%   3.47%   3.30%
Securities Held to Maturity                    
US Treasury and government agencies             $ 228  $ 228 
Residential mortgage-backed (agency)               4,578    4,578 
Commercial mortgage-backed                    
 Agency     $ 316  $ 971    5    1,292 
 Non-agency $ 8    53        2,723    2,784 
Asset-backed       251    73    448    772 
State and municipal   32    25    210    404    671 
Other debt       1    355        356 
Total debt securities held to maturity $ 40  $ 646  $ 1,609  $ 8,386  $ 10,681 
Fair value $ 41  $ 665  $ 1,722  $ 8,804  $ 11,232 
Weighted-average yield, GAAP basis   1.79%   3.07%   3.30%   4.10%   3.91%
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 
     
 September 30, 
 2012 
Agency residential mortgage-backed securities  3.2years 
Non-agency residential mortgage-backed securities  4.9years 
Agency commercial mortgage-backed securities  4.9years 
Non-agency commercial mortgage-backed securities  2.7years 
Asset-backed securities  3.6years 
Fair Value of Securities Pledged and Accepted as Collateral
Table 92: Fair Value of Securities Pledged and Accepted as Collateral     
           
   September 30 December 31 
In millions 2012 2011 
Pledged to others  $ 23,087  $ 20,109 
Accepted from others:         
 Permitted by contract or custom to sell or repledge    1,204    1,796 
 Permitted amount repledged to others    619    892