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Fair Value Measurements - Changes in Fair Value of Level 3 Assets and Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value Assets, Beginning Balance $ 2,615 $ 4,006 $ 3,690 $ 4,157
Fair Value Assets, Trading Revenue (Loss) 49 [1] (44) [1] 13 [1] (248) [1]
Fair Value Assets, Other Revenue 1 [1] (18) [1] 39 [1] (62) [1]
Fair Value Assets, Purchases 15 19 282 534
Fair Value Assets, Issuances 0 5 11 14
Fair Value Assets, Settlements (106) (98) (1,393) (515)
Transfers Into Level 3 5 25 (42) 21
Fair Value Assets, Transfers Out of Level 3 (4) (340) (25) (346)
Fair Value Assets, Ending Balance 2,575 3,555 2,575 3,555
Fair Value Assets, Current Period Unrealized Gains (Losses) 47 (86) (17) (372)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value Liability, Beginning Balance (3,120) (3,195) (3,065) (2,953)
Fair Value Liability, Trading Revenue (Loss) (43) [1] (103) [1] 65 [1] (171) [1]
Fair Value Liability, Purchases 0 0 0 0
Fair Value Liability, Issuances (229) (178) (983) (955)
Fair Value Liability, Settlements 169 96 491 261
Fair Value Liability, Transfers Into Level 3 (110) 2 (265) (48)
Fair Value Liability, Transfers Out of Level 3 103 177 527 665
Fair Value Liability, Ending Balance (3,230) (3,201) (3,230) (3,201)
Fair Value Liability, Current Period Unrealized Gains (Losses) (36) (99) (95) (145)
Interest rate contracts [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value Assets, Beginning Balance (1) [2] 12 [2] 7 [2] 9 [2]
Fair Value Assets, Trading Revenue (Loss) 0 [1],[2] 0 [1],[2] 0 [1],[2] 0 [1],[2]
Fair Value Assets, Other Revenue 2 [1],[2] 2 [1],[2] (6) [1],[2] 5 [1],[2]
Fair Value Assets, Purchases 0 [2] 0 [2] 0 [2] 0 [2]
Fair Value Assets, Issuances 0 [2] 0 [2] 0 [2] 0 [2]
Fair Value Assets, Settlements 0 [2] 0 [2] 0 [2] 0 [2]
Transfers Into Level 3 0 [2] 0 [2] 0 [2] 0 [2]
Fair Value Assets, Transfers Out of Level 3 0 [2] 0 [2] 0 [2] 0 [2]
Fair Value Assets, Ending Balance 1 [2] 14 [2] 1 [2] 14 [2]
Fair Value Assets, Current Period Unrealized Gains (Losses) 2 [2] 1 [2] (7) [2] 4 [2]
Foreign exchange contracts [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value Assets, Beginning Balance 104 [2] (25) [2] 5 [2] (1) [2]
Fair Value Assets, Trading Revenue (Loss) 6 [1],[2] (12) [1],[2] 2 [1],[2] (31) [1],[2]
Fair Value Assets, Other Revenue 0 [1],[2] 0 [1],[2] 0 [1],[2] 0 [1],[2]
Fair Value Assets, Purchases 0 [2] 0 [2] 0 [2] 0 [2]
Fair Value Assets, Issuances 0 [2] (1) [2] 0 [2] (6) [2]
Fair Value Assets, Settlements (6) [2] 9 [2] 110 [2] 11 [2]
Transfers Into Level 3 1 [2] 0 [2] (12) [2] (3) [2]
Fair Value Assets, Transfers Out of Level 3 0 [2] 32 [2] 0 [2] 33 [2]
Fair Value Assets, Ending Balance 105 [2] 3 [2] 105 [2] 3 [2]
Fair Value Assets, Current Period Unrealized Gains (Losses) 0 [2] 20 [2] 107 [2] 1 [2]
Equity contracts [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value Assets, Beginning Balance (83) [2] (46) [2] (7) [2] (83) [2]
Fair Value Assets, Trading Revenue (Loss) 50 [1],[2] 84 [1],[2] 30 [1],[2] 147 [1],[2]
Fair Value Assets, Other Revenue 0 [1],[2] 0 [1],[2] 0 [1],[2] 0 [1],[2]
Fair Value Assets, Purchases 0 [2] 0 [2] 0 [2] 0 [2]
Fair Value Assets, Issuances 0 [2] 0 [2] 0 [2] 0 [2]
Fair Value Assets, Settlements (5) [2] (6) [2] (52) [2] (35) [2]
Transfers Into Level 3 4 [2] 1 [2] 16 [2] 0 [2]
Fair Value Assets, Transfers Out of Level 3 (4) [2] (2) [2] (25) [2] 2 [2]
Fair Value Assets, Ending Balance (38) [2] 31 [2] (38) [2] 31 [2]
Fair Value Assets, Current Period Unrealized Gains (Losses) 47 [2] 71 [2] (28) [2] 93 [2]
Precious metals contracts [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value Assets, Beginning Balance 0 [2] 0 [2] 0 [2] 0 [2]
Fair Value Assets, Trading Revenue (Loss) (1) [1],[2] 1 [1],[2] (1) [1],[2] 1 [1],[2]
Fair Value Assets, Other Revenue 0 [1],[2] 0 [1],[2] 0 [1],[2] 0 [1],[2]
Fair Value Assets, Purchases 0 [2] 0 [2] 0 [2] 0 [2]
Fair Value Assets, Issuances 0 [2] 0 [2] 0 [2] 0 [2]
Fair Value Assets, Settlements 0 [2] 0 [2] 0 [2] 0 [2]
Transfers Into Level 3 0 [2] 0 [2] 0 [2] 0 [2]
Fair Value Assets, Transfers Out of Level 3 0 [2] 0 [2] 0 [2] 0 [2]
Fair Value Assets, Ending Balance (1) [2] 1 [2] (1) [2] 1 [2]
Fair Value Assets, Current Period Unrealized Gains (Losses) (1) [2] 1 [2] (1) [2] 1 [2]
Credit contracts [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value Assets, Beginning Balance 225 [2] 921 [2] 571 [2] 1,353 [2]
Fair Value Assets, Trading Revenue (Loss) (26) [1],[2] (227) [1],[2] (186) [1],[2] (615) [1],[2]
Fair Value Assets, Other Revenue 0 [1],[2] 0 [1],[2] 0 [1],[2] 0 [1],[2]
Fair Value Assets, Purchases 0 [2] 0 [2] 0 [2] 0 [2]
Fair Value Assets, Issuances 0 [2] 0 [2] 0 [2] 0 [2]
Fair Value Assets, Settlements 14 [2] (7) [2] (126) [2] (51) [2]
Transfers Into Level 3 0 [2] (16) [2] 46 [2] (16) [2]
Fair Value Assets, Transfers Out of Level 3 0 [2] (370) [2] 0 [2] (370) [2]
Fair Value Assets, Ending Balance 213 [2] 301 [2] 213 [2] 301 [2]
Fair Value Assets, Current Period Unrealized Gains (Losses) (18) [2] (250) [2] (287) [2] (605) [2]
Collateralized debt obligations [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value Assets, Beginning Balance 227 658 466 703
Fair Value Assets, Trading Revenue (Loss) 21 [1] 44 [1] 139 [1] 101 [1]
Fair Value Assets, Other Revenue 0 [1] 0 [1] 0 [1] 0 [1]
Fair Value Assets, Purchases 0 20 236 45
Fair Value Assets, Issuances 0 0 0 0
Fair Value Assets, Settlements (3) (84) (596) (211)
Transfers Into Level 3 0 40 0 40
Fair Value Assets, Transfers Out of Level 3 0 0 0 0
Fair Value Assets, Ending Balance 245 678 245 678
Fair Value Assets, Current Period Unrealized Gains (Losses) 20 30 137 79
Corporate and other domestic [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value Assets, Beginning Balance 1,498 1,599 1,861 1,679
Fair Value Assets, Trading Revenue (Loss) 0 [1] 24 [1] 28 [1] 42 [1]
Fair Value Assets, Other Revenue 0 [1] 0 [1] 0 [1] 0 [1]
Fair Value Assets, Purchases 15 0 46 101
Fair Value Assets, Issuances 0 0 0 0
Fair Value Assets, Settlements 0 (5) (422) (204)
Transfers Into Level 3 0 0 0 0
Fair Value Assets, Transfers Out of Level 3 0 0 0 0
Fair Value Assets, Ending Balance 1,513 1,618 1,513 1,618
Fair Value Assets, Current Period Unrealized Gains (Losses) 0 24 28 32
Foreign debt securities [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value Assets, Beginning Balance 285 688 299 253
Fair Value Assets, Trading Revenue (Loss) 6 [1] 41 [1] (8) [1] 107 [1]
Fair Value Assets, Other Revenue 0 [1] 0 [1] 0 [1] 0 [1]
Fair Value Assets, Purchases 0 (1) 0 388
Fair Value Assets, Issuances 0 0 0 0
Fair Value Assets, Settlements (99) (4) (99) (24)
Transfers Into Level 3 0 0 0 0
Fair Value Assets, Transfers Out of Level 3 0 0 0 0
Fair Value Assets, Ending Balance 192 724 192 724
Fair Value Assets, Current Period Unrealized Gains (Losses) 6 35 (8) 101
Government debt securities issued by foreign entities [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value Assets, Beginning Balance 135   311  
Fair Value Assets, Trading Revenue (Loss) (7) [1]   14 [1]  
Fair Value Assets, Other Revenue 0 [1]   0 [1]  
Fair Value Assets, Purchases 0   0  
Fair Value Assets, Issuances 0   0  
Fair Value Assets, Settlements (7)   (204)  
Transfers Into Level 3 0   0  
Fair Value Assets, Transfers Out of Level 3 0   0  
Fair Value Assets, Ending Balance 121   121  
Fair Value Assets, Current Period Unrealized Gains (Losses) (8)   2  
Equity securities [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value Assets, Beginning Balance 0 12 9 13
Fair Value Assets, Trading Revenue (Loss) 0 [1] 1 [1] (5) [1] 0 [1]
Fair Value Assets, Other Revenue 0 [1] 0 [1] 0 [1] 0 [1]
Fair Value Assets, Purchases 0 0 0 0
Fair Value Assets, Issuances 0 0 0 0
Fair Value Assets, Settlements 0 (1) (4) (1)
Transfers Into Level 3 0 0 0 0
Fair Value Assets, Transfers Out of Level 3 0 0 0 0
Fair Value Assets, Ending Balance 0 12 0 12
Fair Value Assets, Current Period Unrealized Gains (Losses) 0 1 (5) 0
Mortgage servicing rights [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value Assets, Beginning Balance 225 [2],[3] 187 [2],[3] 168 [2],[3] 220 [2],[3]
Fair Value Assets, Trading Revenue (Loss) 0 [1],[2],[3] 0 [1],[2],[3] 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value Assets, Other Revenue (1) [1],[2],[3] (20) [1],[2],[3] 45 [1],[2],[3] (67) [1],[2],[3]
Fair Value Assets, Purchases 0 [2],[3] 0 [2],[3] 0 [2],[3] 0 [2],[3]
Fair Value Assets, Issuances 0 [2],[3] 6 [2],[3] 11 [2],[3] 20 [2],[3]
Fair Value Assets, Settlements 0 [2],[3] 0 [2],[3] 0 [2],[3] 0 [2],[3]
Transfers Into Level 3 0 [2],[3] 0 [2],[3] 0 [2],[3] 0 [2],[3]
Fair Value Assets, Transfers Out of Level 3 0 [2],[3] 0 [2],[3] 0 [2],[3] 0 [2],[3]
Fair Value Assets, Ending Balance 224 [2],[3] 173 [2],[3] 224 [2],[3] 173 [2],[3]
Fair Value Assets, Current Period Unrealized Gains (Losses) (1) [2],[3] (19) [2],[3] 45 [2],[3] (66) [2],[3]
Deposits In Domestic Office [Member]
        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value Liability, Beginning Balance (2,662) (2,908) (2,636) (2,867)
Fair Value Liability, Trading Revenue (Loss) (26) [1] (81) [1] 98 [1] (158) [1]
Fair Value Liability, Purchases 0 0 0 0
Fair Value Liability, Issuances (73) (119) (558) (675)
Fair Value Liability, Settlements 123 94 326 254
Fair Value Liability, Transfers Into Level 3 (110) 2 (265) (41)
Fair Value Liability, Transfers Out of Level 3 79 132 366 607
Fair Value Liability, Ending Balance (2,669) (2,880) (2,669) (2,880)
Fair Value Liability, Current Period Unrealized Gains (Losses) (11) (79) (79) (129)
Long-term Debt [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value Assets, Beginning Balance       11 [2]
Fair Value Assets, Trading Revenue (Loss)       0 [1],[2]
Fair Value Assets, Other Revenue       0 [1],[2]
Fair Value Assets, Purchases       0 [2]
Fair Value Assets, Issuances       0 [2]
Fair Value Assets, Settlements       0 [2]
Transfers Into Level 3       0 [2]
Fair Value Assets, Transfers Out of Level 3       (11) [2]
Fair Value Assets, Ending Balance   0 [4]   0 [4]
Fair Value Assets, Current Period Unrealized Gains (Losses)       (12) [4]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value Liability, Beginning Balance (458) (287) (429) (86)
Fair Value Liability, Trading Revenue (Loss) (17) [1] (22) [1] (33) [1] (13) [1]
Fair Value Liability, Purchases 0 0 0 0
Fair Value Liability, Issuances (156) (59) (425) (280)
Fair Value Liability, Settlements 46 2 165 7
Fair Value Liability, Transfers Into Level 3 0 0 0 (7)
Fair Value Liability, Transfers Out of Level 3 24 45 161 58
Fair Value Liability, Ending Balance (561) (321) (561) (321)
Fair Value Liability, Current Period Unrealized Gains (Losses) $ (25) $ (20) $ (16) $ (16)
[1] Includes realized and unrealized gains and losses.
[2] Level 3 net derivatives included derivative assets of $897 million and derivative liabilities of $618 million as of September 30, 2013 and derivative assets of $1.8 billion and derivative liabilities of $1.4 billion as of September 30, 2012.
[3] See Note 8, “Intangible Assets,” for additional information.
[4] Includes Level 3 corporate lending activities risk-managed on a fair value basis for which we have elected the fair value option.