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Investment Securities (Tables)
9 Months Ended
Sep. 30, 2011
Investment Securities Disclosure [Abstract] 
Investment Securities Summary
Note 7 Investment Securities  
                
Investment Securities Summary  
                
    AmortizedUnrealized Fair 
In millions CostGainsLosses Value 
September 30, 2011             
                
Securities Available for Sale             
Debt securities             
 US Treasury and government agencies $ 3,397 $ 354    $ 3,751 
 Residential mortgage-backed             
  Agency   26,963   799 $ (79)   27,683 
  Non-agency   6,949   187   (1,148)   5,988 
 Commercial mortgage-backed             
  Agency   956   35      991 
  Non-agency   2,646   53   (53)   2,646 
 Asset-backed   3,914   32   (195)   3,751 
 State and municipal   1,714   65   (51)   1,728 
 Other debt   2,741   96   (12)   2,825 
  Total debt securities   49,280   1,621   (1,538)   49,363 
Corporate stocks and other   352         352 
 Total securities available for sale $ 49,632 $ 1,621 $ (1,538) $ 49,715 
Securities Held to Maturity             
Debt securities             
 US Treasury and government agencies $ 219 $ 37    $ 256 
 Residential mortgage-backed (agency)   4,588   104      4,692 
 Commercial mortgage-backed              
  Agency   1,290   41      1,331 
  Non-agency   3,770   106 $ (5)   3,871 
 Asset-backed   1,489   22   (3)   1,508 
 State and municipal   670   19      689 
 Other debt   364   13      377 
 Total securities held to maturity $ 12,390 $ 342 $ (8) $ 12,724 
                
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 
September 30, 2011                   
Debt securities                   
 US Treasury and government agencies                   
 Residential mortgage-backed                   
  Agency $ (45) $ 3,223 $ (34) $ 828 $ (79) $ 4,051 
  Non-agency   (21)   372   (1,127)   4,645   (1,148)   5,017 
 Commercial mortgage-backed                   
  Agency                   
  Non-agency   (53)   1,134         (53)   1,134 
 Asset-backed   (7)   1,372   (188)   757   (195)   2,129 
 State and municipal   (5)   347   (46)   257   (51)   604 
 Other debt   (9)   560   (3)   37   (12)   597 
   Total $ (140) $ 7,008 $ (1,398) $ 6,524 $ (1,538) $ 13,532 
                       
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-
September 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 0-56%  20%
 Alt-A 0-83   43 
Loss severity        
 Prime 20-65%  47%
 Alt-A 30-85   61 
(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 September 30 Nine months ended September 30 
In millions2011 2010   2011 2010  
Available for sale securities:                
 Non-agency residential mortgage-backed $(30) $ (57)   $ (93) $ (211)  
 Non-agency commercial mortgage-backed             (3)  
 Asset-backed  (5)   (14)     (14)   (67)  
 Other debt           (1)     
Total $(35) $ (71)   $ (108) $ (281)  
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 September 30Nine months ended September 30
In millions2011 2010  2011 2010 
Total $(87) $ (46)  $ (117) $ (194) 
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 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 three months ended September 30, 2010                       
June 30, 2010 $ (621)   $ (9)   $ (198)   $ (12)  $ (840) 
Loss where impairment was not previously recognized   (15)                   (15) 
Additional loss where credit impairment was                        
 previously recognized   (42)          (14)         (56) 
September 30, 2010 $ (678)   $ (9)   $ (212)   $ (12)  $ (911) 

  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) 
                         
  Non-agency Non-agency             
  residential commercial             
In millionsmortgage-backed mortgage-backed Asset-backed Other debt Total 
For the nine months ended September 30, 2010                       
December 31, 2009 $ (479)   $ (6)   $ (145)   $ (12)  $ (642) 
Loss where impairment was not previously recognized   (41)     (3)     (11)         (55) 
Additional loss where credit impairment was previously recognized   (170)          (56)         (226) 
Reduction due to credit impaired securities sold   12                   12 
September 30, 2010 $ (678)   $ (9)   $ (212)   $ (12)  $ (911) 
   
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 nine months ended September 30                
2011 $ 17,564 $ 336 $ (149) $ 187 $ 66 
2010   18,285   421   (63)   358   125 
Contractual Maturity of Debt Securities
Contractual Maturity of Debt Securities
                      
September 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     $ 2,054  $ 910  $ 433  $ 3,397 
Residential mortgage-backed                    
 Agency       6    947    26,010    26,963 
 Non-agency           28    6,921    6,949 
Commercial mortgage-backed                    
 Agency       764    192        956 
 Non-agency $ 28    185    49    2,384    2,646 
Asset-backed   68    887    451    2,508    3,914 
State and municipal   20    72    278    1,344    1,714 
Other debt   134    1,507    606    494    2,741 
 Total debt securities available for sale $ 250  $ 5,475  $ 3,461  $ 40,094  $ 49,280 
Fair value $ 252  $ 5,634  $ 3,683  $ 39,794  $ 49,363 
Weighted-average yield, GAAP basis   2.99%   2.77%   3.48%   3.71%   3.58%
Securities Held to Maturity                    
US Treasury and government agencies             $219  $ 219 
Residential mortgage-backed (agency)               4,588    4,588 
Commercial mortgage-backed                    
 Agency     $16  $ 1,269    5    1,290 
 Non-agency $129   39   58    3,544    3,770 
Asset-backed   8    1,011    105    365    1,489 
State and municipal       54    71    545    670 
Other debt       1    363        364 
Total debt securities held to maturity $ 137  $ 1,121  $ 1,866  $ 9,266  $ 12,390 
Fair value $ 137  $ 1,142  $ 1,923  $ 9,522  $ 12,724 
Weighted-average yield, GAAP basis   5.25%   2.05%   3.35%   4.45%   4.08%
Weighted-Average Expected Maturity of Mortgage and Other Asset-Backed Debt Securities
Weighted-Average Expected Maturity of Mortgage and Other Asset-Backed Debt Securities
    
 September 30,
 2011
Agency residential mortgage-backed securities  3.5years
Non-agency residential mortgage-backed securities  4.5years
Agency commercial mortgage-backed securities  5.4years
Non-agency commercial mortgage-backed securities  2.7years
Asset-backed securities  3.4years
Fair Value of Securities Pledged and Accepted as Collateral
Fair Value of Securities Pledged and Accepted as Collateral      
           
   September 30, December 31, 
In millions 2011 2010 
Pledged to others  $ 22,574  $ 27,985 
Accepted from others:         
 Permitted by contract or custom to sell or repledge    1,674    3,529 
 Permitted amount repledged to others    761    1,971