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Fair Values of Assets and Liabilities (Tables)
6 Months Ended
Jun. 30, 2011
Fair Values of Assets and Liabilities [Abstract]  
Valuation assumption ranges for Level 3 non-agency mortgage-backed securities
                                                     
    Prime (a)       Non-prime  
    Minimum     Maximum     Average       Minimum       Maximum     Average  
June 30, 2011
                                                   
Estimated lifetime prepayment rates
    4 %     20 %     12 %       1 %       13 %     6 %
Lifetime probability of default rates
          14       2                 20       7  
Lifetime loss severity rates
    20       80       40         10         88       54  
Discount margin
    3       37       6                 40       10  
December 31, 2010
                                                   
Estimated lifetime prepayment rates
    4 %     28 %     13 %       1 %       13 %     6 %
Lifetime probability of default rates
          14       1                 20       8  
Lifetime loss severity rates
    16       100       41         10         88       56  
Discount margin
    3       30       6         3         40       11  
                                                     
(a) Prime securities are those designated as such by the issuer or those with underlying asset characteristics and/or credit enhancements consistent with securities designated as prime.
Balances of assets and liabilities measured at fair value on a recurring basis
                                             
(Dollars in Millions)   Level 1     Level 2       Level 3       Netting     Total  
June 30, 2011
                                           
Available-for-sale securities
                                           
U.S. Treasury and agencies
  $ 632     $ 1,241       $       $     $ 1,873  
Mortgage-backed securities
                                           
Residential
                                           
Agency
          39,072                       39,072  
Non-agency
                                           
Prime
                  896               896  
Non-prime
                  895               895  
Commercial
                                           
Agency
          158                       158  
Non-agency
                  50               50  
Asset-backed securities
                                           
Collateralized debt obligations/Collateralized loan obligations
          94         133               227  
Other
          583         129               712  
Obligations of state and political subdivisions
          6,682                       6,682  
Obligations of foreign governments
          6                       6  
Corporate debt securities
          1,013         9               1,022  
Perpetual preferred securities
          475                       475  
Other investments
    222       9                       231  
                                             
Total available-for-sale
    854       49,333         2,112               52,299  
Mortgage loans held for sale
          3,304                       3,304  
Mortgage servicing rights
                  1,989               1,989  
Derivative assets
          724         889         (366 )     1,247  
Other assets
          806                       806  
                                             
Total
  $ 854     $ 54,167       $ 4,990       $ (366 )   $ 59,645  
                                             
Derivative liabilities
  $     $ 2,077       $ 53       $ (1,181 )   $ 949  
Other liabilities
          785                       785  
                                             
Total
  $     $ 2,862       $ 53       $ (1,181 )   $ 1,734  
                                             
December 31, 2010
                                           
Available-for-sale securities
                                           
U.S. Treasury and agencies
  $ 873     $ 1,664       $       $     $ 2,537  
Mortgage-backed securities
                                           
Residential
                                           
Agency
          37,703                       37,703  
Non-agency
                                           
Prime
                  1,103               1,103  
Non-prime
                  947               947  
Commercial
                                           
Agency
          197                       197  
Non-agency
                  50               50  
Asset-backed securities
                                           
Collateralized debt obligations/Collateralized loan obligations
          89         135               224  
Other
          587         133               720  
Obligations of state and political subdivisions
          6,417                       6,417  
Obligations of foreign governments
          6                       6  
Corporate debt securities
          949         9               958  
Perpetual preferred securities
          448                       448  
Other investments
    181       18                       199  
                                             
Total available-for-sale
    1,054       48,078         2,377               51,509  
Mortgage loans held for sale
          8,100                       8,100  
Mortgage servicing rights
                  1,837               1,837  
Derivative assets
          846         953         (280 )     1,519  
Other assets
          470                       470  
                                             
Total
  $ 1,054     $ 57,494       $ 5,167       $ (280 )   $ 63,435  
                                             
Derivative liabilities
  $     $ 2,072       $ 102       $ (1,163 )   $ 1,011  
Other liabilities
          470                       470  
                                             
Total
  $     $ 2,542       $ 102       $ (1,163 )   $ 1,481  
                                             
Changes in fair value for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
                                                 
                Net Gains
    Net Total
          Net Change in
 
                (Losses)
    Purchases,
          Unrealized Gains
 
          Net Gains
    Included in
    Sales, Principal
          (Losses) Relating
 
    Beginning
    (Losses)
    Other
    Payments,
    End
    to Assets
 
    of Period
    Included in
    Comprehensive
    Issuances and
    of Period
    Still Held at
 
(Dollars in Millions)   Balance     Net Income     Income (Loss)     Settlements     Balance     End of Period  
2011
                                               
Available-for-sale securities
                                               
Mortgage-backed securities
                                               
Residential non-agency
                                               
Prime
  $ 963     $ 1     $ (22 )   $ (46 )   $ 896     $ (22 )
Non-prime
    947       (2 )     (19 )     (31 )     895       (19 )
Commercial non-agency
    50       1       (1 )           50        
Asset-backed securities
                                               
Collateralized debt obligations/Collateralized loan obligations
    142       3       (1 )     (11 )     133        
Other
    133       3       (1 )     (6 )     129       (1 )
Corporate debt securities
    9                         9        
                                                 
Total available-for-sale
    2,244       6 (a)     (44 )     (94 )     2,112       (42 )
Mortgage servicing rights
    2,073       (190 ) (b)           106       1,989       (190 ) (b)
Net derivative assets and liabilities
    747       373 (c)           (284 )     836       (30 ) (d)
2010
                                               
Available-for-sale securities
                                               
Mortgage-backed securities
                                               
Residential non-agency
                                               
Prime
  $ 1,304     $     $ 21     $ (128 )   $ 1,197     $ 19  
Non-prime
    900       (6 )     52       (39 )     907       52  
Commercial non-agency
    14             1             15       1  
Asset-backed securities
                                               
Collateralized debt obligations/Collateralized loan obligations
    79       (2 )     (2 )           75       (1 )
Other
    335       (3 )     4       (8 )     328       5  
Corporate debt securities
    10                         10        
Other investments
    237       4       34       (9 )     266       34  
                                                 
Total available-for-sale
    2,879       (7 ) (e)     110       (184 )     2,798       110  
Mortgage servicing rights
    1,778       (385 ) (b)           150       1,543       (385 ) (b)
Net derivative assets and liabilities
    905       687 (f)           (298 )     1,294       68 (g)
                                                 
(a) Approximately $(9) million included in securities gains (losses) and $15 million included in interest income.
(b) Included in mortgage banking revenue.
(c) Approximately $232 million included in other noninterest income and $141 million included in mortgage banking revenue.
(d) Approximately $115 million included in other noninterest income and $(145) million included in mortgage banking revenue.
(e) Approximately $(21) million included in securities gains (losses) and $14 million included in interest income.
(f) Approximately $372 million included in other noninterest income and $315 million included in mortgage banking revenue.
(g) Approximately $260 million included in other noninterest income and $(192) million included in mortgage banking revenue.
 
                                                 
                Net Gains
    Net Total
          Net Change in
 
                (Losses)
    Purchases,
          Unrealized Gains
 
          Net Gains
    Included in
    Sales, Principal
          (Losses) Relating
 
    Beginning
    (Losses)
    Other
    Payments,
    End
    to Assets
 
    of Period
    Included in
    Comprehensive
    Issuances and
    of Period
    Still Held at
 
(Dollars in Millions)   Balance     Net Income     Income (Loss)     Settlements     Balance     End of Period  
2011
                                               
Available-for-sale securities
                                               
Mortgage-backed securities
                                               
Residential non-agency
                                               
Prime
  $ 1,103     $ 3     $ 24     $ (234 )   $ 896     $ 16  
Non-prime
    947       (2 )     32       (82 )     895       31  
Commercial non-agency
    50       1             (1 )     50        
Asset-backed securities
                                               
Collateralized debt obligations/Collateralized loan obligations
    135       7       8       (17 )     133       9  
Other
    133       7       2       (13 )     129       2  
Corporate debt securities
    9                         9        
                                                 
Total available-for-sale
    2,377       16 (a)     66       (347 )     2,112       58  
Mortgage servicing rights
    1,837       (174 ) (b)           326       1,989       (174 ) (b)
Net derivative assets and liabilities
    851       416 (c)           (431 )     836       (169 ) (d)
2010
                                               
Available-for-sale securities
                                               
Mortgage-backed securities
                                               
Residential non-agency
                                               
Prime
  $ 1,429     $     $ 50     $ (282 )   $ 1,197     $ 44  
Non-prime
    968       (37 )     68       (92 )     907       68  
Commercial non-agency
    13             2             15       1  
Asset-backed securities
                                               
Collateralized debt obligations/Collateralized loan obligations
    98             (2 )     (21 )     75        
Other
    357       (5 )     (2 )     (22 )     328       (1 )
Corporate debt securities
    10                         10        
Other investments
    231       2       47       (14 )     266       47  
                                                 
Total available-for-sale
    3,106       (40 ) (e)     163       (431 )     2,798       159  
Mortgage servicing rights
    1,749       (493 ) (b)           287       1,543       (493 ) (b)
Net derivative assets and liabilities
    815       1,059 (f)           (580 )     1,294       41 (g)
                                                 
(a) Approximately $(15) million included in securities gains (losses) and $31 million included in interest income.
(b) Included in mortgage banking revenue.
(c) Approximately $227 million included in other noninterest income and $189 million included in mortgage banking revenue.
(d) Approximately $(14) million included in other noninterest income and $(155) million included in mortgage banking revenue.
(e) Approximately $(67) million included in securities gains (losses) and $27 million included in interest income.
(f) Approximately $613 million included in other noninterest income and $446 million included in mortgage banking revenue.
(g) Approximately $338 million included in other noninterest income and $(297) million included in mortgage banking revenue.
 
Additional detail of purchases, sales, principal payments, issuances and settlements
                                                     
                  Principal
                     
(Dollars in Millions)   Purchases     Sales       Payments     Issuances       Settlements     Net Total  
Available-for-sale securities
                                                   
Mortgage-backed securities
                                                   
Residential non-agency
                                                   
Prime
  $     $       $ (46 )   $       $     $ (46 )
Non-prime
                  (31 )                   (31 )
Asset-backed securities
                                                   
Collateralized debt obligations/Collateralized loan obligations
                  (11 )                   (11 )
Other
                  (6 )                   (6 )
                                                     
Total available-for-sale
                  (94 )                   (94 )
Mortgage servicing rights
    4                     102 (a)             106  
Net derivative assets and liabilities
          (2 )                     (282 )     (284 )
                                                     
(a) Represents MSRs capitalized during the period
                                                     
                  Principal
                     
(Dollars in Millions)   Purchases     Sales       Payments     Issuances       Settlements     Net Total  
Available-for-sale securities
                                                   
Mortgage-backed securities
                                                   
Residential non-agency
                                                   
Prime
  $     $ (115 )     $ (119 )   $       $     $ (234 )
Non-prime
          (12 )       (70 )                   (82 )
Commercial non-agency
                  (1 )                   (1 )
Asset-backed securities
                                                   
Collateralized debt obligations/Collateralized loan obligations
                  (17 )                   (17 )
Other
                  (13 )                   (13 )
                                                     
Total available-for-sale
          (127 )       (220 )                   (347 )
Mortgage servicing rights
    11                     315 (a)             326  
Net derivative assets and liabilities
          (3 )                     (428 )     (431 )
                                                     
(a) Represents MSRs capitalized during the period
Adjusted carrying values for assets measured at fair value on a nonrecurring basis
                                                                   
    June 30, 2011       December 31, 2010  
(Dollars in Millions)   Level 1     Level 2     Level 3     Total       Level 1     Level 2     Level 3     Total  
Loans (a)
  $     $ 151     $     $ 151       $     $ 404     $ 1     $ 405  
Other real estate owned (b)
          275             275               812             812  
Other intangible assets
                                          1       1  
Other assets
                                    4       9       13  
                                                                   
(a) Represents the carrying value of loans for which adjustments are based on the appraised value of the collateral, excluding loans fully charged-off.
(b) Represents the fair value of foreclosed properties that were measured at fair value based on the appraisal value of the collateral subsequent to their initial acquisition.
Losses recognized related to nonrecurring fair value measurements of individual assets or portfolios
                                   
    Three Months
      Six Months
 
    Ended June 30,       Ended June 30,  
(Dollars in Millions)   2011     2010       2011     2010  
Loans (a)
  $ 106     $ 92       $ 121     $ 213  
Other real estate owned (b)
    62       65         149       115  
Other intangible assets
                         
Other assets
                         
                                   
(a) Represents write-downs of loans which are based on the appraised value of the collateral, excluding loans fully charged-off.
(b) Represents related losses of foreclosed properties that were measured at fair value subsequent to their initial acquisition.
Difference between the aggregate fair value carrying amount of MLFHS and aggregate unpaid principal amount
 
                                                   
    June 30, 2011       December 31, 2010  
                Carrying
                  Carrying
 
    Fair Value
    Aggregate
    Amount Over
      Fair Value
    Aggregate
    Amount Over
 
    Carrying
    Unpaid
    (Under) Unpaid
      Carrying
    Unpaid
    (Under) Unpaid
 
(Dollars in Millions)   Amount     Principal     Principal       Amount     Principal     Principal  
Total loans
  $ 3,304     $ 3,187     $ 117       $ 8,100     $ 8,034     $ 66  
Nonaccrual loans
    9       15       (6 )       11       18       (7 )
Loans 90 days or more past due
    4       4               6       6        
                                                   
 
Estimated fair values of financial instruments
                                   
    June 30, 2011       December 31, 2010  
    Carrying
    Fair
      Carrying
    Fair
 
(Dollars in Millions)   Amount     Value       Amount     Value  
Financial Assets
                                 
Cash and due from banks
  $ 15,250     $ 15,250       $ 14,487     $ 14,487  
Investment securities held-to-maturity
    13,280       13,431         1,469       1,419  
Mortgages held for sale (a)
    5       5         4       4  
Other loans held for sale
    234       234         267       267  
Loans
    194,811       196,711         191,751       192,058  
Financial Liabilities
                                 
Deposits
    214,883       215,330         204,252       204,799  
Short-term borrowings
    29,654       29,816         32,557       32,839  
Long-term debt
    32,830       33,419         31,537       31,981  
                                   
(a) Balance excludes mortgages held for sale for which the fair value option under applicable accounting guidance was elected.