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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, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Assets, Beginning Balance $ 4,006 $ 4,090 $ 4,157 $ 3,500
Fair Value Assets, Trading Revenue (Loss) (44) 366 (248) 450
Fair Value Assets, Other Revenue (18) (125) (62) (176)
Fair Value Assets, Other Comprehensive Income            
Fair Value Assets, Purchases 19 29 534 914
Fair Value Assets, Issuances 5   14  
Fair Value Assets, Settlements (98) (66) (515) (493)
Fair Value Assets, Transfers Into Level 3 25 (18) 21 33
Fair Value Assets, Transfers Out of Level 3 (340) 94 (346) 142
Fair Value Assets, Ending Balance 3,555 4,370 3,555 4,370
Fair Value Assets, Current Period Unrealized Gains (Losses) (86) 353 (372) 120
Fair Value Liability, Beginning Balance (3,195) (5,404) (2,953) (3,913)
Fair Value Liability, Trading Revenue (Loss) (103) 175 (171) 72
Fair Value Liability, Other Comprehensive Income            
Fair Value Liability, Purchases            
Fair Value Liability, Issuances (178) 610 (955) 2,486
Fair Value Liability, Settlements 96 153 261 537
Fair Value Liability, Transfers Into Level 3 2   (48) 28
Fair Value Liability, Transfers Out of Level 3 (177) 642 (665) 773
Fair Value Liability, Ending Balance (3,201) (5,044) (3,201) (5,044)
Fair Value Liability, Current Period Unrealized Gains (Losses) (99) 78 (145) 79
Interest rate contracts [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Assets, Beginning Balance 12 3 9 (1)
Fair Value Assets, Other Revenue 2 9 5 13
Fair Value Assets, Other Comprehensive Income            
Fair Value Assets, Ending Balance 14 12 14 12
Fair Value Assets, Current Period Unrealized Gains (Losses) 1 9 4 13
Foreign exchange contracts [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Assets, Beginning Balance (25) 1 (1) (4)
Fair Value Assets, Trading Revenue (Loss) (12) (2) (31) 3
Fair Value Assets, Other Comprehensive Income            
Fair Value Assets, Issuances (1)   (6)  
Fair Value Assets, Settlements 9   11  
Fair Value Assets, Transfers Into Level 3     (3)  
Fair Value Assets, Transfers Out of Level 3 32   33  
Fair Value Assets, Ending Balance 3 (1) 3 (1)
Fair Value Assets, Current Period Unrealized Gains (Losses) 20 (1) 1 3
Equity contracts [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Assets, Beginning Balance (46) (29) (83) 12
Fair Value Assets, Trading Revenue (Loss) 84 (173) 147 (93)
Fair Value Assets, Other Comprehensive Income            
Fair Value Assets, Settlements (6) (30) (35) (188)
Fair Value Assets, Transfers Into Level 3 1 (18)   33
Fair Value Assets, Transfers Out of Level 3 (2) 94 2 80
Fair Value Assets, Ending Balance 31 (156) 31 (156)
Fair Value Assets, Current Period Unrealized Gains (Losses) 71 (33) 93 (109)
Precious metals contracts [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Assets, Trading Revenue (Loss) 1   1  
Fair Value Assets, Other Comprehensive Income          
Fair Value Assets, Ending Balance 1   1  
Fair Value Assets, Current Period Unrealized Gains (Losses) 1   1  
Credit contracts [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Assets, Beginning Balance 921 1,069 1,353 1,202
Fair Value Assets, Trading Revenue (Loss) (227) 613 (615) 562
Fair Value Assets, Other Comprehensive Income            
Fair Value Assets, Settlements (7) (13) (51) (157)
Fair Value Assets, Transfers Into Level 3 (16)   (16)  
Fair Value Assets, Transfers Out of Level 3 (370)   (370) 62
Fair Value Assets, Ending Balance 301 1,669 301 1,669
Fair Value Assets, Current Period Unrealized Gains (Losses) (250) 598 (605) 441
Collateralized debt obligations [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Assets, Beginning Balance 658 770 703 793
Fair Value Assets, Trading Revenue (Loss) 44 (41) 101 (14)
Fair Value Assets, Other Comprehensive Income            
Fair Value Assets, Purchases 20 7 45 100
Fair Value Assets, Settlements (84) (29) (211) (172)
Fair Value Assets, Transfers Into Level 3 40   40  
Fair Value Assets, Ending Balance 678 707 678 707
Fair Value Assets, Current Period Unrealized Gains (Losses) 30 (48) 79 (31)
Corporate and other domestic [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Assets, Beginning Balance 1,599 1,615 1,679 833
Fair Value Assets, Trading Revenue (Loss) 24 5 42  
Fair Value Assets, Other Comprehensive Income            
Fair Value Assets, Purchases   22 101 814
Fair Value Assets, Settlements (5)   (204) (5)
Fair Value Assets, Ending Balance 1,618 1,642 1,618 1,642
Fair Value Assets, Current Period Unrealized Gains (Losses) 24 (5) 32  
Foreign debt securities [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Assets, Beginning Balance 688 271 253 243
Fair Value Assets, Trading Revenue (Loss) 41 (34) 107 (6)
Fair Value Assets, Other Comprehensive Income            
Fair Value Assets, Purchases (1)   388  
Fair Value Assets, Settlements (4)   (24)  
Fair Value Assets, Ending Balance 724 237 724 237
Fair Value Assets, Current Period Unrealized Gains (Losses) 35 (33) 101 (6)
Equity securities [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Assets, Beginning Balance 12 16 13 17
Fair Value Assets, Trading Revenue (Loss) 1 (2)   (2)
Fair Value Assets, Other Comprehensive Income            
Fair Value Assets, Settlements (1) (2) (1) (3)
Fair Value Assets, Ending Balance 12 12 12 12
Fair Value Assets, Current Period Unrealized Gains (Losses) 1 (1)   (2)
Loans [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Assets, Beginning Balance   11 11 11
Fair Value Assets, Other Comprehensive Income            
Fair Value Assets, Transfers Out of Level 3     (11)  
Fair Value Assets, Ending Balance   11   11
Fair Value Assets, Current Period Unrealized Gains (Losses)     (12)  
Mortgage servicing rights [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Assets, Beginning Balance 187 363 220 394
Fair Value Assets, Other Revenue (20) (134) (67) (189)
Fair Value Assets, Other Comprehensive Income            
Fair Value Assets, Issuances 6   20  
Fair Value Assets, Settlements   8   32
Fair Value Assets, Ending Balance 173 237 173 237
Fair Value Assets, Current Period Unrealized Gains (Losses) (19) (133) (66) (189)
Deposits In Domestic Office
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Liability, Beginning Balance (2,908) (4,719) (2,867) (3,612)
Fair Value Liability, Trading Revenue (Loss) (81) 62 (158) (29)
Fair Value Liability, Other Comprehensive Income            
Fair Value Liability, Purchases            
Fair Value Liability, Issuances (119) 588 (675) 1,865
Fair Value Liability, Settlements 94 107 254 348
Fair Value Liability, Transfers Into Level 3 2   (41) 25
Fair Value Liability, Transfers Out of Level 3 (132) 207 (607) 252
Fair Value Liability, Ending Balance (2,880) (4,931) (2,880) (4,931)
Fair Value Liability, Current Period Unrealized Gains (Losses) (79) 68 (129) 67
Long-term Debt [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Liability, Beginning Balance (287) (685) (86) (301)
Fair Value Liability, Trading Revenue (Loss) (22) 113 (13) 101
Fair Value Liability, Other Comprehensive Income            
Fair Value Liability, Purchases            
Fair Value Liability, Issuances (59) 22 (280) 621
Fair Value Liability, Settlements 2 46 7 189
Fair Value Liability, Transfers Into Level 3     (7) 3
Fair Value Liability, Transfers Out of Level 3 (45) 435 (58) 521
Fair Value Liability, Ending Balance (321) (113) (321) (113)
Fair Value Liability, Current Period Unrealized Gains (Losses) $ (20) $ 10 $ (16) $ 12