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Fair Value Of Financial Instruments (Changes In Level 3 Assets And Liabilities Measured At Fair Value On Recurring Basis) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Variable Interest Entity [Member]
Loans Receivable [Member]
Sep. 30, 2012
Variable Interest Entity [Member]
Loan Repurchase Commitments [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Variable Interest Entity [Member]
Loans Receivable [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Variable Interest Entity [Member]
Loans Receivable [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Variable Interest Entity [Member]
Loans Receivable [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Variable Interest Entity [Member]
Loans Receivable [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Variable Interest Entity [Member]
Loan Repurchase Commitments [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Variable Interest Entity [Member]
Loan Repurchase Commitments [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Variable Interest Entity [Member]
Loan Repurchase Commitments [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Variable Interest Entity [Member]
Loan Repurchase Commitments [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Foreign Governments [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Foreign Governments [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Foreign Governments [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Foreign Governments [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Corporate Obligations [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Corporate Obligations [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Corporate Obligations [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Corporate Obligations [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Corporate Obligations [Member]
Variable Interest Entity [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Corporate Obligations [Member]
Variable Interest Entity [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Corporate Obligations [Member]
Variable Interest Entity [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Corporate Obligations [Member]
Variable Interest Entity [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Residential Mortgage-Backed Agency [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Residential Mortgage-Backed Agency [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Residential Mortgage-Backed Agency [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Residential Mortgage-Backed Agency [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Residential Mortgage-Backed Non-Agency [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Residential Mortgage-Backed Non-Agency [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Residential Mortgage-Backed Non-Agency [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Residential Mortgage-Backed Non-Agency [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Residential Mortgage-Backed Non-Agency [Member]
Variable Interest Entity [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Residential Mortgage-Backed Non-Agency [Member]
Variable Interest Entity [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Residential Mortgage-Backed Non-Agency [Member]
Variable Interest Entity [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Residential Mortgage-Backed Non-Agency [Member]
Variable Interest Entity [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Commercial Mortgage-Backed [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Commercial Mortgage-Backed [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Commercial Mortgage-Backed [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Commercial Mortgage-Backed [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Commercial Mortgage-Backed [Member]
Variable Interest Entity [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Commercial Mortgage-Backed [Member]
Variable Interest Entity [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Commercial Mortgage-Backed [Member]
Variable Interest Entity [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Commercial Mortgage-Backed [Member]
Variable Interest Entity [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Collateralized Debt Obligations [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Collateralized Debt Obligations [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Collateralized Debt Obligations [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Collateralized Debt Obligations [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Collateralized Debt Obligations [Member]
Variable Interest Entity [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Collateralized Debt Obligations [Member]
Variable Interest Entity [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Collateralized Debt Obligations [Member]
Variable Interest Entity [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Collateralized Debt Obligations [Member]
Variable Interest Entity [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Other Asset-Backed [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Other Asset-Backed [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Other Asset-Backed [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Other Asset-Backed [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Other Asset-Backed [Member]
Variable Interest Entity [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Other Asset-Backed [Member]
Variable Interest Entity [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Other Asset-Backed [Member]
Variable Interest Entity [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Other Asset-Backed [Member]
Variable Interest Entity [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
State And Municipal Taxable Bonds [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
State And Municipal Taxable Bonds [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
State And Municipal Taxable Bonds [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
State And Municipal Taxable Bonds [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
State And Municipal Tax-Exempt Bonds [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
State And Municipal Tax-Exempt Bonds [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
State And Municipal Tax-Exempt Bonds [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
State And Municipal Tax-Exempt Bonds [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Perpetual Preferred Securities [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Perpetual Preferred Securities [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Perpetual Preferred Securities [Member]
Jun. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Perpetual Preferred Securities [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Other Investments [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Other Investments [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Medium-Term Notes [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Medium-Term Notes [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Medium-Term Notes [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Medium-Term Notes [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Credit Derivatives [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Credit Derivatives [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Credit Derivatives [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Credit Derivatives [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Credit Derivatives [Member]
Liabilities Of Consolidated VIEs [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Credit Derivatives [Member]
Liabilities Of Consolidated VIEs [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Credit Derivatives [Member]
Liabilities Of Consolidated VIEs [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Interest Rate Derivatives [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Interest Rate Derivatives [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Interest Rate Derivatives [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Interest Rate Derivatives [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Currency Derivatives [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Currency Derivatives [Member]
Liabilities Of Consolidated VIEs [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Currency Derivatives [Member]
Liabilities Of Consolidated VIEs [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Currency Derivatives [Member]
Liabilities Of Consolidated VIEs [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Currency Derivatives [Member]
Liabilities Of Consolidated VIEs [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Variable Interest Entity Notes [Member]
Liabilities Of Consolidated VIEs [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Variable Interest Entity Notes [Member]
Liabilities Of Consolidated VIEs [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Variable Interest Entity Notes [Member]
Liabilities Of Consolidated VIEs [Member]
Sep. 30, 2011
Significant Unobservable Inputs (Level 3) [Member]
Variable Interest Entity Notes [Member]
Liabilities Of Consolidated VIEs [Member]
Sep. 30, 2012
Significant Unobservable Inputs (Level 3) [Member]
Interest Rate Derivative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]                                                                                                                                                                                                          
Beginning Balance, Fair Value Assets $ 1,892 $ 1,051 $ 3,544 $ 4,528 $ 4,188 $ 4,467 $ 1,903 $ 2,320 $ 2,046 $ 2,183 $ 1,032 $ 905 $ 1,077 $ 835 $ 12 $ 13 $ 11 $ 11 $ 98 $ 294 $ 207 $ 246 $ 95 $ 62 $ 69 $ 82 $ 4   $ 8 $ 41 $ 33 $ 28 $ 17 $ 48 $ 10 $ 17 $ 21 $ 40 $ 27 $ 50 $ 24 $ 41 $ 12 $ 27 $ 22 $ 23 $ 29 $ 162 $ 60 $ 192 $ 140 $ 201 $ 203 $ 245 $ 69 $ 331 $ 317 $ 349 $ 42 $ 73 $ 67 $ 81   $ 13   $ 14 $ 25 $ 32 $ 28 $ 36   $ 1   $ 3 $ 10 $ 10                                                  
Realized Gains / (Losses), Assets     (7) (5) (83) (8)                           (1) (15) (1)                 (1) (1) (1) (2)           (2)   (2)         (4) (2) (9) (4)         (2)   (58)             1   1                                                                      
Unrealized Gains / (Losses) Included in Earnings, Assets     70 (18) 29 311 61 (36) 52 260 19 33 (26) 91         4   9   (10) (5) (15) (18)                   3 6 2         1 (1) 3 6         (5) (17) (5) (27)         (1) 5 4 (3)                         1 1                                                  
Unrealized Gains / (Losses) Included in OCI, Assets     14 (45) 112 6                         (2) (10) 24 (3)     (6)       1 1 2 1 (1) 11       3 1   5 2         9 (3) 18 25 2 (7) (1) (7) 2 (27) 71 (26)           1               1                                                          
Foreign Exchange Recognized in OCI or Earnings, Assets     1 (7) 1 (3)                 1 (2) 1 (1)   (5)   (2)                       (1)               1                                                                                                                      
Purchases, Assets     13 126 78 182                 9 3 22 9 2 19 18 30     28     1   2   4   15         1   1 8           39   46   60   60 1   5 10     4                 2                                                              
Issuances, Assets       2   15               12                                                                   2   3                                                                                                      
Settlements, Assets     (117) (216) (314) (486) (72) (66) (204) (223)         (10) (3) (19) (8) (13) (32) (29) (65) (2) (1) (5) (5) (1)   (1) (1) (5) (4) (11) (14) (1) (1) (5) (6)   (3)   (3)     (3) (2) (4) (79) (12) (112) (1) (1) (1) (3) (1) (9) (11) (20) (5)   (8) (2)   (15)   (15) (2) (2) (5) (7)                                                              
Sales, Assets       (123) (540) (170)     (2) (2)             (3)     (38) (140) (50)               (1)     (3) (19)   (6) (15) (6)   (13)   (14)   (11) (8) (12)   (28) (10) (36)   (21) (74) (21)     (250) (2)   (6) (35) (6)               (1)                                                              
Transfers into Level 3, Assets     163 [1] 144 [1] 265 [1] 349 [1]                       7 [1] 10 [1] 115 [1] 25 [1] 202 [1] 3 [1] 7 [1] 15 [1] 11 [1]     4 [1]   1 [1] 1 [1] 31 [1] 9 [1] 2 [1] 2 [1] 5 [1] 2 [1] 1 [1]   1 [1]     2 [1] 5 [1] 2 [1] 4 [1] 1 [1] 14 [1] 49 [1] 37 [1] 12 [1] 51 [1] 48 [1] 4 [1] 3 [1] 5 [1] 16 [1] 30 [1]   34 [1] 2 [1] 71 [1]   71 [1]           1 [1] 4 [1] 1 [1]                                                        
Transfers out of Level 3, Assets     (44) [1] (77) [1] (99) [1] (354) [1]                       (7) [1] (8) [1]   (8) [1] (15) [1] (3) [1]   (3) [1] (7) [1] (3) [1]   (12) [1] (41) [1] (23) [1] (2) [1] (25) [1] (20) [1] (3) [1]   (4) [1] (20) [1]     (1) [1] (1) [1]     (6) [1]   (4) [1] (25) [1] (31) [1] (96) [1]   (21) [1]   (89) [1]   (28) [1] (6) [1] (57) [1]   (1) [1]   (1) [1]                   (3) [1]                                                          
Ending Balance, Fair Value Assets 1,892 1,051 3,637 4,309 3,637 4,309 1,892 2,218 1,892 2,218 1,051 938 1,051 938 12 11 12 11 91 342 91 342 83 63 83 63   1   1 7 27 7 27 8 15 8 15 30 32 30 32 13 17 13 17 30 67 30 67 173 206 173 206 73 270 73 270 66 71 66 71 71   71   23 30 23 30 1 3 1 3 11 11                                                  
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Assets     84 (15) 52 357 61 (36) 52 260 19 33 (26) 91         3   8   1 (2) 3 (2)                   1 3 2         1 (2) 2 3         (2) (14) 5 1         1 5 5 2                                                                              
Beginning Balance, Fair Value Liabilities     5,320 11,308 7,938 9,916                                                                                                                                             151 206 165 116 3,285 5,657 4,790 4,350 920 80 768 (4) (4) (3) (5)   21 16 17 14 1,867 4,513 2,889 4,673  
Realized Gains / (Losses), Liabilities       78 463 683                                                                                                                                                       78 463 683                                  
Unrealized Gains / (Losses) Included in Earnings, Liabilities     176 (1,191) (1,115) 616                                                                                                                                             14 (69) 3 9 32 (777) (1,473) 530 (154) 2 (3)   1 (1) 1   2 2 6 4 128 (194) 348 75  
Unrealized Gains / (Losses) Included in OCI, Liabilities                                                                                                                                                                                                                                       
Foreign Exchange Recognized in OCI or Earnings, Liabilities     3 (9)   3                                                                                                                                             3 (9)   3                                          
Purchases, Liabilities                                                                                                                                                                                                                                       
Issuances, Liabilities                                                                                                                                                                                                                                       
Settlements, Liabilities     (110) (286) (832) (1,139)                                                                                                                                                       (78) (463) (683) (1)                       (110) (207) (369) (456)  
Sales, Liabilities       (981) (1,065) (1,161)                                                                                                                                                               (82)                       (981) (983) (1,161)  
Transfers into Level 3, Liabilities     5 [1]   5 [1] 1 [1]                                                                                                                                                                   4 [1]   4 [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]    [1]
Ending Balance, Fair Value Liabilities     5,394 8,919 5,394 8,919                                                                                                                                             168 128 168 128 3,317 4,880 3,317 4,880 765   765   (3)   (3) 1 23 18 23 18 1,885 3,131 1,885 3,131 1
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Liabilities still held, Liabilities     $ 182 $ (798) $ (224) $ 2,251                                                                                                                                             $ 14 $ (69) $ 4 $ 9 $ 33 $ (388) $ (538) $ 2,160 $ (154)   $ (3) $ 5 $ 5 $ 12 $ 6   $ 2 $ 2 $ 6 $ 4 $ 128 $ (194) $ 292 $ 75  
[1] Transferred in and out at the end of the period.