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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2013
Investment Securities Disclosure [Abstract]  
Investment Securities Summary
Note 8 Investment Securities  
                
Table 80: Investment Securities Summary 
                
    AmortizedUnrealized Fair 
In millions CostGainsLosses Value 
June 30, 2013             
                
Securities Available for Sale             
Debt securities             
 U.S. Treasury and government agencies $ 2,052 $ 158    $ 2,210 
 Residential mortgage-backed             
  Agency   23,915   514 $ (181)   24,248 
  Non-agency   5,816   292   (256)   5,852 
 Commercial mortgage-backed             
  Agency   574   22   (1)   595 
  Non-agency   3,560   135   (16)   3,679 
 Asset-backed   6,036   57   (59)   6,034 
 State and municipal   2,193   64   (40)   2,217 
 Other debt   2,733   60   (26)   2,767 
  Total debt securities   46,879   1,302   (579)   47,602 
Corporate stocks and other   297         297 
 Total securities available for sale $ 47,176 $ 1,302 $ (579) $ 47,899 
Securities Held to Maturity             
Debt securities             
 U.S. Treasury and government agencies $ 234 $ 21    $ 255 
 Residential mortgage-backed (agency)   3,773   84 $ (32)   3,825 
 Commercial mortgage-backed              
  Agency   1,262   57      1,319 
  Non-agency   2,193   42   (4)   2,231 
 Asset-backed   1,100   3   (3)   1,100 
 State and municipal   639   19      658 
 Other debt   349   12      361 
 Total securities held to maturity $ 9,550 $ 238 $ (39) $ 9,749 
                
December 31, 2012             
                
Securities Available for Sale             
Debt securities             
 U.S. 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             
 U.S. 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 
Gross Unrealized Loss and Fair Value of Securities Available for Sale
Table 81: 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, 2013                   
Debt securities                   
 Residential mortgage-backed                   
  Agency $ (176) $ 8,046 $ (5) $ 163 $ (181) $ 8,209 
  Non-agency   (53)   1,563   (203)   1,877   (256)   3,440 
 Commercial mortgage-backed                   
  Agency   (1)   32         (1)   32 
  Non-agency   (16)   1,039         (16)   1,039 
 Asset-backed   (8)   1,055   (51)   228   (59)   1,283 
 State and municipal   (22)   818   (18)   274   (40)   1,092 
 Other debt   (25)   867   (1)   16   (26)   883 
   Total $ (301) $ 13,420 $ (278) $ 2,558 $ (579) $ 15,978 
                       
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                   
  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 
Credit Impairment Assessment Assumptions - Non Agency Residential Mortgage-Backed and Asset-Backed Securities
Table 82: Credit Impairment Assessment Assumptions - Non-Agency Residential Mortgage-Backed and Asset-Backed Securities (a) 
            
   Weighted- 
June 30, 2013Range 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 1-45%  18% 
 Alt-A 7-57   33  
 Option ARM 16-69   48  
Loss severity         
 Prime 25-71%  43% 
 Alt-A 30-85   56  
 Option ARM 40-70   59  
(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.  
Other-Than-Temporary-Impairments
Table 83: Other-Than-Temporary Impairments  
                    
   Three months ended June 30  Six months ended June 30  
In millions2013 2012    2013 2012  
Credit portion of OTTI losses                 
 Available for sale securities:                 
  Non-agency residential mortgage-backed $(3) $ (31)    $(10) $ (63)  
  Asset-backed  (1)   (3)     (4)   (8)  
  Other debt               (1)  
Total credit portion of OTTI losses  (4)   (34)     (14)   (72)  
Noncredit portion of OTTI (losses) recoveries   (6)   2      3   24  
Total OTTI losses $(10) $(32)     (11)  (48)  
Rollforward of Cumulative OTTI Credit Losses Recognized in Earnings
Table 84: 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, 2013                       
March 31, 2013 $ (887)   $ (6)   $ (258)   $ (14)  $ (1,165) 
Additional loss where credit impairment was                        
 previously recognized   (3)          (1)         (4) 
Reduction due to credit impaired securities sold or matured   5                   5 
June 30, 2013 $ (885)   $ (6)   $ (259)   $ (14)  $ (1,164) 
                         
  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 six months ended June 30, 2013                       
December 31, 2012 $ (926)   $ (6)   $ (255)   $ (14)  $ (1,201) 
Additional loss where credit impairment was previously recognized   (10)          (4)         (14) 
Reduction due to credit impaired securities sold or matured   51                   51 
June 30, 2013 $ (885)   $(6)   $ (259)   $ (14)  $ (1,164) 
                         
  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 or matured   1                   1 
June 30, 2012 $ (890)   $ (6)   $ (252)   $ (14)  $ (1,162) 
   
Gains (Losses) on Sales Of Securities Available for Sale
Table 85: 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                
2013 $ 3,877 $ 98 $ (23) $ 75 $ 26 
2012   6,607   129   (10)   119   42 
Contractual Maturity of Debt Securities
Table 86: Contractual Maturity of Debt Securities
                      
June 30, 2013   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                    
U.S. Treasury and government agencies $ 1  $ 1,082  $ 804  $ 165  $ 2,052 
Residential mortgage-backed                    
 Agency   1    33    513    23,368    23,915 
 Non-agency       12    2    5,802    5,816 
Commercial mortgage-backed                    
 Agency   10    528    36        574 
 Non-agency   75    59    105    3,321    3,560 
Asset-backed   5    1,088    2,138    2,805    6,036 
State and municipal   12    116    389    1,676    2,193 
Other debt   524    1,337    529    343    2,733 
 Total debt securities available for sale $ 628  $ 4,255  $ 4,516  $ 37,480  $ 46,879 
Fair value $ 635  $ 4,356  $ 4,658  $ 37,953  $ 47,602 
Weighted-average yield, GAAP basis   2.72%   2.45%   2.38%   3.30%   3.13%
Securities Held to Maturity                    
U.S. Treasury and government agencies             $ 234  $ 234 
Residential mortgage-backed (agency)               3,773    3,773 
Commercial mortgage-backed                    
 Agency     $ 423  $ 834    5    1,262 
 Non-agency       51        2,142    2,193 
Asset-backed       60    80    960    1,100 
State and municipal       34    282    323    639 
Other debt       1    348        349 
Total debt securities held to maturity     $ 569  $ 1,544  $ 7,437  $ 9,550 
Fair value     $ 583  $ 1,607  $ 7,559  $ 9,749 
Weighted-average yield, GAAP basis       3.32%   3.42%   3.82%   3.72%
Weighted-Average Expected Maturity of Mortgage and Other Asset-Backed Debt Securities
Table 87: Weighted-Average Expected Maturity of Mortgage and Other Asset-Backed Debt Securities 
    
June 30, 2013 Years 
Agency residential mortgage-backed securities 4.6 
Non-agency residential mortgage-backed securities 5.9 
Agency commercial mortgage-backed securities 4.2 
Non-agency commercial mortgage-backed securities 2.4 
Asset-backed securities 3.8 
Fair Value of Securities Pledged and Accepted as Collateral
Table 88: Fair Value of Securities Pledged and Accepted as Collateral     
           
   June 30 December 31 
In millions 2013 2012 
Pledged to others  $ 23,058  $ 25,648 
Accepted from others:         
 Permitted by contract or custom to sell or repledge    1,122    1,015 
 Permitted amount repledged to others    888    685