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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2011
Investment Securities Disclosure  
Investment Securities Summary
Note 7 Investment Securities  
                
Investment Securities Summary  
                
    AmortizedUnrealized Fair 
In millions CostGainsLosses Value 
June 30, 2011             
                
Securities Available for Sale             
Debt securities             
 US Treasury and government agencies $ 3,954 $ 188 $ (12) $ 4,130 
 Residential mortgage-backed             
  Agency   25,126   479   (105)   25,500 
  Non-agency   7,232   220   (998)   6,454 
 Commercial mortgage-backed             
  Agency   1,276   28   (1)   1,303 
  Non-agency   2,494   63   (12)   2,545 
 Asset-backed   3,839   37   (191)   3,685 
 State and municipal   2,281   73   (52)   2,302 
 Other debt   3,343   111   (12)   3,442 
  Total debt securities   49,545   1,199   (1,383)   49,361 
Corporate stocks and other   306         306 
 Total securities available for sale $ 49,851 $ 1,199 $ (1,383) $ 49,667 
Securities Held to Maturity             
Debt securities             
 Residential mortgage-backed (agency) $ 2,775 $ 1 $ (8) $ 2,768 
 Commercial mortgage-backed              
  Agency   508      (2)   506 
  Non-agency   4,027   147   (2)   4,172 
 Asset-backed   2,063   31   (2)   2,092 
 State and municipal   8   1      9 
 Other debt   366      (3)   363 
 Total securities held to maturity $ 9,747 $ 180 $ (17) $ 9,910 
                
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
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, 2011                   
Debt securities                   
 US Treasury and government agencies $ (12) $ 232       $ (12) $ 232 
 Residential mortgage-backed                   
  Agency   (76)   6,465 $ (29) $ 841   (105)   7,306 
  Non-agency   (26)   601   (972)   4,810   (998)   5,411 
 Commercial mortgage-backed                   
  Agency   (1)   1         (1)   1 
  Non-agency   (12)   1,178         (12)   1,178 
 Asset-backed   (6)   819   (185)   722   (191)   1,541 
 State and municipal   (5)   363   (47)   250   (52)   613 
 Other debt   (10)   354   (2)   13   (12)   367 
   Total $ (148) $ 10,013 $ (1,235) $ 6,636 $ (1,383) $ 16,649 
                       
December 31, 2010                   
Debt securities                   
 US Treasury and government agencies $ (22) $ 398       $ (22) $ 398 
 Residential mortgage-backed                   
  Agency   (406)   17,040 $ (14) $ 186   (420)   17,226 
  Non-agency   (17)   345   (1,173)   5,707   (1,190)   6,052 
 Commercial mortgage-backed                   
  Agency   (6)   344         (6)   344 
  Non-agency   (8)   184   (3)   84   (11)   268 
 Asset-backed   (5)   441   (233)   776   (238)   1,217 
 State and municipal   (22)   931   (50)   247   (72)   1,178 
 Other debt   (14)   701   (3)   13   (17)   714 
   Total $ (500) $ 20,384 $ (1,476) $ 7,013 $ (1,976) $ 27,397 
Credit Impairment Assessment Assumptions - Non Agency Residential Mortgage-Backed and Asset-Backed Securities
Credit Impairment Assessment Assumptions – Non-Agency Residential Mortgage-Backed and Asset-Backed Securities (a)
           
   Weighted-
June 30, 2011Range average (b)
Long-term prepayment rate (annual CPR)        
 Prime 7-20%  14%
 Alt-A 3-12   5 
Remaining collateral expected to default        
 Prime 1-53%  20%
 Alt-A 3-84   43 
Loss severity        
 Prime 20-70%  46%
 Alt-A 30-80   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
Summary of OTTI Credit Losses Recognized in Earnings   
                  
  Three months ended June 30 Six months ended June 30 
In millions2011 2010   2011 2010  
Available for sale securities:                
 Non-agency residential mortgage-backed $(35) $ (81)   $ (63) $ (154)  
 Non-agency commercial mortgage-backed     (3)       (3)  
 Asset-backed  (4)   (10)     (9)   (53)  
 Other debt           (1)     
Total $(39) $ (94)   $ (73) $ (210)  
Summary of OTTI Noncredit Losses Recognized in Accumulated Other Comprehensive Loss
Summary of OTTI Noncredit Losses Included in Accumulated Other Comprehensive Loss  
                
  Three months ended June 30Six months ended June 30
In millions2011 2010  2011 2010 
Total $(34) $ (24)  $ (30) $ (148) 
Rollforward of Cumulative OTTI Credit Losses Recognized in Earnings
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, 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 three months ended June 30, 2010                       
March 31, 2010 $ (540)   $ (6)   $ (188)   $ (12)  $ (746) 
Loss where impairment was not previously recognized   (14)     (3)     (6)         (23) 
Additional loss where credit impairment was                        
 previously recognized   (67)          (4)         (71) 
June 30, 2010 $ (621)   $ (9)   $ (198)   $ (12)  $ (840) 

  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) 
                         
  Non-agency Non-agency             
  residential commercial             
In millionsmortgage-backed mortgage-backed Asset-backed Other debt Total 
For the six months ended June 30, 2010                       
December 31, 2009 $ (479)   $ (6)   $ (145)   $ (12)  $ (642) 
Loss where impairment was not previously recognized   (26)     (3)     (11)         (40) 
Additional loss where credit impairment was previously recognized   (128)          (42)         (170) 
Reduction due to credit impaired securities sold   12                   12 
June 30, 2010 $ (621)   $ (9)   $ (198)   $ (12)  $ (840) 
   
Gains (Losses) on Sales Of Securities Available for Sale
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                
2011 $ 15,436 $ 267 $ 148 $ 119 $ 42 
2010   14,164   297   60   237   83 
Contractual Maturity of Debt Securities
Contractual Maturity of Debt Securities
                      
June 30, 2011   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     $ 1,694  $ 1,830  $ 430  $ 3,954 
Residential mortgage-backed                    
 Agency       7    1,023    24,096    25,126 
 Non-agency           30    7,202    7,232 
Commercial mortgage-backed                    
 Agency       723    479    74    1,276 
 Non-agency $ 33    146    49    2,266    2,494 
Asset-backed   68    795    451    2,525    3,839 
State and municipal   37    121    312    1,811    2,281 
Other debt   156    2,162    504    521    3,343 
 Total debt securities available for sale $ 294  $ 5,648  $ 4,678  $ 38,925  $ 49,545 
Fair value $ 298  $ 5,816  $ 4,854  $ 38,393  $ 49,361 
Weighted-average yield, GAAP basis   3.03%   2.67%   3.48%   3.95%   3.75%
Securities Held to Maturity                    
Residential mortgage-backed (agency)             $ 2,775  $ 2,775 
Commercial mortgage-backed                    
 Agency         $374    134    508 
 Non-agency $137  $47   58    3,785    4,027 
Asset-backed   30    1,517    136    380    2,063 
State and municipal           5    3    8 
Other debt       1    365        366 
Total debt securities held to maturity $ 167  $ 1,565  $ 938  $ 7,077  $ 9,747 
Fair value $ 171  $ 1,594  $ 936  $ 7,209  $ 9,910 
Weighted-average yield, GAAP basis   4.49%   2.02%   3.28%   4.68%   4.11%
Weighted-Average Expected Maturity of Mortgage and Other Asset-Backed Debt Securities
Weighted-Average Expected Maturity of Mortgage and Other Asset-Backed Debt Securities
    
 June 30,
 2011
Agency mortgage-backed securities  4.4years
Non-agency mortgage-backed securities  4.7years
Agency commercial mortgage-backed securities  4.6years
Non-agency commercial mortgage-backed securities  2.9years
Asset-backed securities  3.2years
Fair Value of Securities Pledged and Accepted as Collateral
Fair Value of Securities Pledged and Accepted as Collateral      
           
   June 30, December 31, 
In millions 2011 2010 
Pledged to others  $ 23,071  $ 27,985 
Accepted from others:         
 Permitted by contract or custom to sell or repledge    2,185    3,529 
 Permitted amount repledged to others    1,083    1,971