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Fair Value Measurement (Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Loans Receivable [Member]
Variable Interest Entity [Member]
Jun. 30, 2011
Loans Receivable [Member]
Variable Interest Entity [Member]
Jun. 30, 2012
Loans Receivable [Member]
Variable Interest Entity [Member]
Jun. 30, 2011
Loans Receivable [Member]
Variable Interest Entity [Member]
Jun. 30, 2012
Loan Repurchase Commitments [Member]
Variable Interest Entity [Member]
Jun. 30, 2011
Loan Repurchase Commitments [Member]
Variable Interest Entity [Member]
Jun. 30, 2012
Loan Repurchase Commitments [Member]
Variable Interest Entity [Member]
Jun. 30, 2011
Loan Repurchase Commitments [Member]
Variable Interest Entity [Member]
Jun. 30, 2012
Foreign Governments [Member]
Jun. 30, 2011
Foreign Governments [Member]
Jun. 30, 2012
Foreign Governments [Member]
Jun. 30, 2011
Foreign Governments [Member]
Jun. 30, 2012
Corporate Obligations [Member]
Jun. 30, 2011
Corporate Obligations [Member]
Jun. 30, 2012
Corporate Obligations [Member]
Jun. 30, 2011
Corporate Obligations [Member]
Jun. 30, 2012
Corporate Obligations [Member]
Variable Interest Entity [Member]
Jun. 30, 2011
Corporate Obligations [Member]
Variable Interest Entity [Member]
Jun. 30, 2012
Corporate Obligations [Member]
Variable Interest Entity [Member]
Jun. 30, 2011
Corporate Obligations [Member]
Variable Interest Entity [Member]
Jun. 30, 2012
Residential Mortgage-Backed Agency [Member]
Jun. 30, 2012
Residential Mortgage-Backed Agency [Member]
Jun. 30, 2011
Residential Mortgage-Backed Agency [Member]
Jun. 30, 2012
Residential Mortgage-Backed Non-Agency [Member]
Jun. 30, 2011
Residential Mortgage-Backed Non-Agency [Member]
Jun. 30, 2012
Residential Mortgage-Backed Non-Agency [Member]
Jun. 30, 2011
Residential Mortgage-Backed Non-Agency [Member]
Jun. 30, 2012
Residential Mortgage-Backed Non-Agency [Member]
Variable Interest Entity [Member]
Jun. 30, 2011
Residential Mortgage-Backed Non-Agency [Member]
Variable Interest Entity [Member]
Jun. 30, 2012
Residential Mortgage-Backed Non-Agency [Member]
Variable Interest Entity [Member]
Jun. 30, 2011
Residential Mortgage-Backed Non-Agency [Member]
Variable Interest Entity [Member]
Jun. 30, 2012
Commercial Mortgage-Backed [Member]
Jun. 30, 2011
Commercial Mortgage-Backed [Member]
Jun. 30, 2012
Commercial Mortgage-Backed [Member]
Jun. 30, 2011
Commercial Mortgage-Backed [Member]
Jun. 30, 2012
Commercial Mortgage-Backed [Member]
Variable Interest Entity [Member]
Jun. 30, 2011
Commercial Mortgage-Backed [Member]
Variable Interest Entity [Member]
Jun. 30, 2012
Commercial Mortgage-Backed [Member]
Variable Interest Entity [Member]
Jun. 30, 2011
Commercial Mortgage-Backed [Member]
Variable Interest Entity [Member]
Jun. 30, 2012
Collateralized Debt Obligations [Member]
Jun. 30, 2011
Collateralized Debt Obligations [Member]
Jun. 30, 2012
Collateralized Debt Obligations [Member]
Jun. 30, 2011
Collateralized Debt Obligations [Member]
Jun. 30, 2012
Collateralized Debt Obligations [Member]
Variable Interest Entity [Member]
Jun. 30, 2011
Collateralized Debt Obligations [Member]
Variable Interest Entity [Member]
Jun. 30, 2012
Collateralized Debt Obligations [Member]
Variable Interest Entity [Member]
Jun. 30, 2011
Collateralized Debt Obligations [Member]
Variable Interest Entity [Member]
Jun. 30, 2012
Other Asset-Backed [Member]
Jun. 30, 2011
Other Asset-Backed [Member]
Jun. 30, 2012
Other Asset-Backed [Member]
Jun. 30, 2011
Other Asset-Backed [Member]
Jun. 30, 2012
Other Asset-Backed [Member]
Variable Interest Entity [Member]
Jun. 30, 2011
Other Asset-Backed [Member]
Variable Interest Entity [Member]
Jun. 30, 2012
Other Asset-Backed [Member]
Variable Interest Entity [Member]
Jun. 30, 2011
Other Asset-Backed [Member]
Variable Interest Entity [Member]
Jun. 30, 2012
State And Municipal Tax Exempt Bonds [Member]
Jun. 30, 2011
State And Municipal Tax Exempt Bonds [Member]
Jun. 30, 2012
State And Municipal Tax Exempt Bonds [Member]
Jun. 30, 2011
State And Municipal Tax Exempt Bonds [Member]
Jun. 30, 2012
Perpetual Preferred Securities [Member]
Jun. 30, 2012
Perpetual Preferred Securities [Member]
Jun. 30, 2012
Total Other Investments [Member]
Mar. 31, 2012
Total Other Investments [Member]
Dec. 31, 2011
Total Other Investments [Member]
Jun. 30, 2012
Medium-term Notes [Member]
Jun. 30, 2011
Medium-term Notes [Member]
Jun. 30, 2012
Medium-term Notes [Member]
Jun. 30, 2011
Medium-term Notes [Member]
Jun. 30, 2012
Credit Derivatives [Member]
Jun. 30, 2011
Credit Derivatives [Member]
Jun. 30, 2012
Credit Derivatives [Member]
Jun. 30, 2011
Credit Derivatives [Member]
Jun. 30, 2012
Credit Derivatives [Member]
Liabilities Of Consolidated VIEs [Member]
Jun. 30, 2011
Credit Derivatives [Member]
Liabilities Of Consolidated VIEs [Member]
Jun. 30, 2012
Credit Derivatives [Member]
Liabilities Of Consolidated VIEs [Member]
Jun. 30, 2011
Credit Derivatives [Member]
Liabilities Of Consolidated VIEs [Member]
Jun. 30, 2012
Interest Rate Derivatives [Member]
Jun. 30, 2011
Interest Rate Derivatives [Member]
Jun. 30, 2012
Interest Rate Derivatives [Member]
Jun. 30, 2011
Interest Rate Derivatives [Member]
Jun. 30, 2012
Variable Interest Entity Notes [Member]
Liabilities Of Consolidated VIEs [Member]
Jun. 30, 2011
Variable Interest Entity Notes [Member]
Liabilities Of Consolidated VIEs [Member]
Jun. 30, 2012
Variable Interest Entity Notes [Member]
Liabilities Of Consolidated VIEs [Member]
Jun. 30, 2011
Variable Interest Entity Notes [Member]
Liabilities Of Consolidated VIEs [Member]
Jun. 30, 2012
Currency Derivatives [Member]
Liabilities Of Consolidated VIEs [Member]
Jun. 30, 2011
Currency Derivatives [Member]
Liabilities Of Consolidated VIEs [Member]
Jun. 30, 2012
Currency Derivatives [Member]
Liabilities Of Consolidated VIEs [Member]
Jun. 30, 2011
Currency Derivatives [Member]
Liabilities Of Consolidated VIEs [Member]
Jun. 30, 2011
Municipal Bonds [Member]
Jun. 30, 2011
Municipal Bonds [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]                                                                                                                                                                                            
Beginning Balance, Fair Value Assets $ 3,937 $ 4,439 $ 4,188 $ 4,467 $ 2,025 $ 2,327 $ 2,046 $ 2,183 $ 1,076 $ 867 $ 1,077 $ 835 $ 12 $ 19 $ 11 $ 11 $ 185 $ 212 $ 207 $ 247 $ 75 $ 84 $ 69 $ 82 $ 9 $ 8 $ 41 $ 14 $ 43 $ 17 $ 48 $ 25 $ 18 $ 21 $ 40 $ 25 $ 51 $ 24 $ 41 $ 15 $ 29 $ 22 $ 23 $ 35 $ 123 $ 60 $ 191 $ 218 $ 219 $ 203 $ 245 $ 115 $ 322 $ 317 $ 349 $ 71 $ 79 $ 67 $ 81 $ 27 $ 34 $ 28 $ 36   $ 1 $ 10 $ 10 $ 10                                                 $ 12 $ 14
Realized Gains / (Losses), Assets (3) (2) (80) (3)                             (15)                   (1)   (1)                         (1) (1) (4) (2)         (2)   (61)                                                                                
Unrealized Gains / (Losses) Included in Earnings, Assets (94) 63 (42) 329 (49) 68 (10) 296 (44) 38 (45) 58         2   5   (6) (13) (5) (13)               1 1 6 (1)         1 1 2 7         (2) (26)   (10)         3 (6) 5 (8)                                                                      
Unrealized Gains / (Losses) Included in OCI, Assets 15 7 102 51                         13   26 7 (6)   (6)     1 1 (4) 5 (3) 10       3 2   4 2         3 8 9 28 (3)   (2)   10 (7) 73 1                                                                           1 (1)
Foreign Exchange Recognized in OCI or Earnings, Assets (3) (11)   (8)                 (1)       (2) 1   3                 (2)   (2)               1           (9)   (9)           (1)   (1)                                                                              
Purchases, Assets 57 25 64 57                 7 4 13 7 16 1 15 11 28   28       1   4   11           1   9           5   7         2 8 4 9 4   4     2   2                                                              
Issuances, Assets       13               12                                                                     1                                                                                              
Settlements, Assets (110) (99) (196) (273) (71) (73) (131) (157)         (3) (3) (9) (5) (15) (2) (16) (35) (2) (2) (3) (4)     (1) (5) (6) (7) (11) (2) (2) (4) (5)         (1) (2) (3) (2) (4) (4) (9) (33)       (3) (2) (1) (8) (10) (3) (1) (3) (2) (2) (3) (3) (5)                                                              
Sales, Assets (312) (31) (540) (48) (2) (2) (2) (2)         (3)   (3)   (115)   (138) (12)             (1) (1) (18) (1) (19) (15)   (15)     (2)   (2) (8) (1) (8) (1) (7) (6) (10) (8) (75)   (75)   (50) (1) (252) (2) (36)   (36)     (1)   (1)                                                              
Transfers into Level 3, Assets 72 [1] 165 [1] 103 [1] 207 [1]                       7 [1] 14 [1] 82 [1] 14 [1] 88 [1] 6 [1]   12 [1] 4 [1] 4 [1] 4 [1]   26 [1] 3 [1] 26 [1] 8 [1] 1 [1]   3 [1]           5 [1]   5 [1]   4 [1] 46 [1] 10 [1] 48 [1] 2 [1] 22 [1] 14 [1] 37 [1] 4 [1] 11 [1] 6 [1] 13 [1] 3 [1] 1 [1] 5 [1] 2 [1]         3 [1] 4 [1]                                                          
Transfers out of Level 3, Assets (15) [1] (28) [1] (55) [1] (264) [1]                   (7) [1]   (7) [1]       (15) [1]   (7) [1]   (7) [1] (9) [1] (9) [1] (41) [1]     (2) [1] (16) [1]     (1) [1] (20) [1]     (1) [1] (1) [1]     (6) [1]   (1) [1]   (27) [1] (61) [1]   (14) [1]   (68) [1] (5) [1]   (7) [1] (28) [1]                   (2) [1]                                                          
Ending Balance, Fair Value Assets 3,544 4,528 3,544 4,528 1,903 2,320 1,903 2,320 1,032 905 1,032 905 12 13 12 13 98 294 98 294 95 62 95 62 4 4   30 28 30 28 10 17 10 17 27 50 27 50 12 27 12 27 29 162 29 162 140 201 140 201 72 331 72 331 42 73 42 73 25 32 25 32 3 3 10 10 10                                                 13 13
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Assets (82) 113 (32) 378 (49) 68 (10) 296 (44) 38 (45) 58         2   5       1 (1)                 1 5 2         1 (1) 1 6         6 5 7 19         2 2 4 (2)                                                                      
Beginning Balance, Fair Value Liabilities 7,622 11,822 7,938 9,916                                                                                                                                 174 163 165 116 4,487 5,772 4,790 4,350 82 926 80 768 (4) (4) (3) (5) 2,864 4,953 2,889 4,673 19 12 17 14    
Realized Gains / (Losses), Liabilities 443 218 463 605                                                                                                                                         443 218 463 605                                    
Unrealized Gains / (Losses) Included in Earnings, Liabilities (1,154) (78) (1,290) 2,123                                                                                                                                 (16) 39 (11) 78 (1,202) (116) (1,505) 1,307   (6) 2 152   (1) (1)   62 2 221 584 2 4 4 2    
Unrealized Gains / (Losses) Included in OCI, Liabilities                                                                                                                                                                                                                        
Foreign Exchange Recognized in OCI or Earnings, Liabilities (7) 4 (3) 12                                                                                                                                 (7) 4 (3) 12                                            
Purchases, Liabilities                                                                                                                                                                                                                        
Issuances, Liabilities                                                                                                                                                                                                                        
Settlements, Liabilities (519) (480) (723) (1,169)                                                                                                                                         (443) (218) (463) (605)                 (76) (262) (260) (564)            
Sales, Liabilities (1,065) (180) (1,065) (180)                                                                                                                                                 (82)   (82)           (983) (180) (983) (180)            
Transfers into Level 3, Liabilities   1 [1]   1 [1]                                                                                                                                                           1 [1]   1 [1]                    
Transfers out of Level 3, Liabilities    [1]    [1]    [1]    [1]                                                                                                                                    [1]    [1]    [1]    [1]    [1]    [1]    [1]    [1]    [1]    [1]    [1]    [1]    [1]    [1]    [1]    [1]    [1]    [1]    [1]    [1]    [1]    [1]    [1]    [1]    
Ending Balance, Fair Value Liabilities 5,320 11,308 5,320 11,308                                                                                                                                 151 206 151 206 3,285 5,657 3,285 5,657   920   920 (4) (4) (4) (4) 1,867 4,513 1,867 4,513 21 16 21 16    
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Liabilities still held, Liabilities $ (593) $ 937 $ (406) $ 2,944                                                                                                                                 $ (16) $ 39 $ (11) $ 78 $ (641) $ 897 $ (571) $ 2,128   $ (7)   $ 151   $ 2 $ 7 $ 1 $ 62 $ 2 $ 165 $ 584 $ 2 $ 4 $ 4 $ 2    
[1] Transferred in and out at the end of the period.