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Fair Value Measurement - Changes in Level 3 Measurements (Details 1) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Total debt and equity instruments [Member]
    
Assets    
Fair Value, Beginning balance$ 32,791$ 35,660$ 34,554$ 35,681
Total realized/ unrealized gains/(losses)(408)1,3461,074873
Purchases5,176 15,206 
Sales(4,612) (15,233) 
Issuances0 0 
Settlements(1,312) (3,603) 
Purchases, issuances, settlements, net 349 577
Transfers into and/or out of level 3144(440)(219)(216)
Fair Value, Ending Balance31,77936,91531,77936,915
Change in unrealized gains/(losses) related to financial instruments(565)1,121166967
Trading liabilities - Debt and equity instruments [Member]
    
Liabilities    
Beginning balance19745410
Total realized/unrealized (gains)/losses702(4)
Purchases(111) (244) 
Sales296 573 
Issuances0 0 
Settlements(79) (79) 
Purchases, issuances, settlements, net 20 (13)
Transfers into and/or out of level 300423
Ending balance3102431024
Change in unrealized (gains)/losses related to financial instruments01(12)(1)
Total debt instruments [Member]
    
Assets    
Fair Value, Beginning balance30,47532,91831,93932,284
Total realized/ unrealized gains/(losses)(481)1,158730548
Purchases5,127 15,040 
Sales(4,338) (14,748) 
Issuances0 0 
Settlements(1,265) (3,120) 
Purchases, issuances, settlements, net 354 1,468
Transfers into and/or out of level 3167(366)(156)(236)
Fair Value, Ending Balance29,68534,06429,68534,064
Change in unrealized gains/(losses) related to financial instruments(604)892(160)485
Total mortgage-backed securities [Member]
    
Assets    
Fair Value, Beginning balance2,8712,7192,9303,145
Total realized/ unrealized gains/(losses)2181205398
Purchases225 1,323 
Sales(180) (1,234) 
Issuances0 0 
Settlements(125) (370) 
Purchases, issuances, settlements, net (186) (775)
Transfers into and/or out of level 3(56)0(117)(54)
Fair Value, Ending Balance2,7372,7142,7372,714
Change in unrealized gains/(losses) related to financial instruments(45)8229147
U.S. government agencies [Member]
    
Assets    
Fair Value, Beginning balance165176174260
Total realized/ unrealized gains/(losses)333227
Purchases0 28 
Sales0 (39) 
Issuances0 0 
Settlements(15) (42) 
Purchases, issuances, settlements, net 0 (105)
Transfers into and/or out of level 3(58)0(58)(3)
Fair Value, Ending Balance9517995179
Change in unrealized gains/(losses) related to financial instruments(6)(9)(17)(19)
Residential - nonagency [Member]
    
Assets    
Fair Value, Beginning balance8638046871,115
Total realized/ unrealized gains/(losses)(13)89114166
Purchases104 609 
Sales(98) (369) 
Issuances0 0 
Settlements(51) (175) 
Purchases, issuances, settlements, net (233) (573)
Transfers into and/or out of level 320(59)(48)
Fair Value, Ending Balance807660807660
Change in unrealized gains/(losses) related to financial instruments(41)171262
Commercial - nonagency [Member]
    
Assets    
Fair Value, Beginning balance1,8431,7392,0691,770
Total realized/ unrealized gains/(losses)128959205
Purchases121 686 
Sales(82) (826) 
Issuances0 0 
Settlements(59) (153) 
Purchases, issuances, settlements, net 47 (97)
Transfers into and/or out of level 3000(3)
Fair Value, Ending Balance1,8351,8751,8351,875
Change in unrealized gains/(losses) related to financial instruments27434104
Obligations of U.S. states and municipalities [Member]
    
Assets    
Fair Value, Beginning balance1,8552,0082,2571,971
Total realized/ unrealized gains/(losses)112111(6)
Purchases68 624 
Sales(369) (1,338) 
Issuances0 0 
Settlements0 (1) 
Purchases, issuances, settlements, net 21 (57)
Transfers into and/or out of level 30012142
Fair Value, Ending Balance1,5652,0501,5652,050
Change in unrealized gains/(losses) related to financial instruments1019(3)(24)
Non-U.S. government debt securities [Member]
    
Assets    
Fair Value, Beginning balance8211420289
Total realized/ unrealized gains/(losses)5(6)9(28)
Purchases201 444 
Sales(166) (420) 
Issuances0 0 
Settlements(24) (63) 
Purchases, issuances, settlements, net 88 135
Transfers into and/or out of level 30(3)(74)(3)
Fair Value, Ending Balance9819398193
Change in unrealized gains/(losses) related to financial instruments5(5)11(10)
Corporate debt securities [Member]
    
Assets    
Fair Value, Beginning balance5,6064,5514,9465,241
Total realized/ unrealized gains/(losses)(60)16(5)(315)
Purchases1,388 4,817 
Sales(1,570) (4,465) 
Issuances0 0 
Settlements(175) (292) 
Purchases, issuances, settlements, net 73 (394)
Transfers into and/or out of level 371(229)259(121)
Fair Value, Ending Balance5,2604,4115,2604,411
Change in unrealized gains/(losses) related to financial instruments(35)42(46)(36)
Loans [Member]
    
Assets    
Fair Value, Beginning balance11,74214,88913,14413,218
Total realized/ unrealized gains/(losses)14537335247
Purchases1,547 4,161 
Sales(988) (3,765) 
Issuances0 0 
Settlements(880) (2,033) 
Purchases, issuances, settlements, net 754 2,797
Transfers into and/or out of level 3149(135)(258)(217)
Fair Value, Ending Balance11,58416,04511,58416,045
Change in unrealized gains/(losses) related to financial instruments(81)424155278
Asset-backed securities [Member]
    
Assets    
Fair Value, Beginning balance8,3198,6378,4608,620
Total realized/ unrealized gains/(losses)(453)409175252
Purchases1,698 3,671 
Sales(1,065) (3,526) 
Issuances0 0 
Settlements(61) (361) 
Purchases, issuances, settlements, net (396) (238)
Transfers into and/or out of level 3312217
Fair Value, Ending Balance8,4418,6518,4418,651
Change in unrealized gains/(losses) related to financial instruments(458)330(306)130
Equity securities [Member]
    
Assets    
Fair Value, Beginning balance1,4081,8221,6851,956
Total realized/ unrealized gains/(losses)7525315106
Purchases40 138 
Sales(272) (471) 
Issuances0 0 
Settlements(22) (398) 
Purchases, issuances, settlements, net 14 (217)
Transfers into and/or out of level 3(23)(74)(63)(58)
Fair Value, Ending Balance1,2061,7871,2061,787
Change in unrealized gains/(losses) related to financial instruments5159294263
Other equity instruments [Member]
    
Assets    
Fair Value, Beginning balance9089209301,441
Total realized/ unrealized gains/(losses)(2)16329219
Purchases9 28 
Sales(2) (14) 
Issuances0 0 
Settlements(25) (85) 
Purchases, issuances, settlements, net (19) (674)
Transfers into and/or out of level 300078
Fair Value, Ending Balance8881,0648881,064
Change in unrealized gains/(losses) related to financial instruments(12)17032219
Total net derivative receivables [Member]
    
Assets    
Fair Value, Beginning balance2,83710,3084,35710,837
Total realized/ unrealized gains/(losses)4,911(1,129)6,11480
Purchases348 1,181 
Sales(388) (1,182) 
Issuances0 0 
Settlements(1,001) (3,603) 
Purchases, issuances, settlements, net (1,185) (3,089)
Transfers into and/or out of level 3(146)34(306)200
Fair Value, Ending Balance6,5618,0286,5618,028
Change in unrealized gains/(losses) related to financial instruments3,503(1,655)4,7201,188
Interest rate
    
Assets    
Fair Value, Beginning balance3,1173,0472,8362,040
Total realized/ unrealized gains/(losses)1,9431,4443,8692,885
Purchases97 442 
Sales(52) (171) 
Issuances0 0 
Settlements(1,432) (3,335) 
Purchases, issuances, settlements, net (1,168) (1,743)
Transfers into and/or out of level 3(206)(26)(174)115
Fair Value, Ending Balance3,4673,2973,4673,297
Change in unrealized gains/(losses) related to financial instruments931595945915
Credit derivatives
    
Assets    
Fair Value, Beginning balance4,7339,7865,38610,350
Total realized/ unrealized gains/(losses)3,909(1,635)3,357(236)
Purchases19 21 
Sales(7) (10) 
Issuances0 0 
Settlements183 102 
Purchases, issuances, settlements, net (132) (2,093)
Transfers into and/or out of level 30(40)(19)(42)
Fair Value, Ending Balance8,8377,9798,8377,979
Change in unrealized gains/(losses) related to financial instruments3,712(1,443)3,570291
Foreign exchange
    
Assets    
Fair Value, Beginning balance(536)51(614)1,082
Total realized/ unrealized gains/(losses)(1,236)(596)(1,718)(1,489)
Purchases51 167 
Sales(15) (18) 
Issuances0 0 
Settlements179 641 
Purchases, issuances, settlements, net 471 627
Transfers into and/or out of level 3(31)(12)(46)(306)
Fair Value, Ending Balance(1,588)(86)(1,588)(86)
Change in unrealized gains/(losses) related to financial instruments(1,250)(445)(300)191
Equity Contract [Member]
    
Assets    
Fair Value, Beginning balance(3,203)(2,159)(2,446)(2,306)
Total realized/ unrealized gains/(losses)(85)(268)(63)(354)
Purchases117 352 
Sales(309) (881) 
Issuances0 0 
Settlements91 (448) 
Purchases, issuances, settlements, net (90) (86)
Transfers into and/or out of level 317598304
Fair Value, Ending Balance(3,388)(2,442)(3,388)(2,442)
Change in unrealized gains/(losses) related to financial instruments(177)(284)343(224)
Commodity
    
Assets    
Fair Value, Beginning balance(1,274)(417)(805)(329)
Total realized/ unrealized gains/(losses)380(74)669(726)
Purchases64 199 
Sales(5) (102) 
Issuances0 0 
Settlements(22) (563) 
Purchases, issuances, settlements, net (266) 206
Transfers into and/or out of level 39037(165)129
Fair Value, Ending Balance(767)(720)(767)(720)
Change in unrealized gains/(losses) related to financial instruments287(78)16215
Available-for-sale Securities [Member]
    
Assets    
Fair Value, Beginning balance15,90312,74414,28713,193
Total realized/ unrealized gains/(losses)(455)122127(50)
Purchases9,406 11,366 
Sales(1,392) (1,421) 
Issuances0 0 
Settlements(1,393) (2,290) 
Purchases, issuances, settlements, net 1,612 1,230
Transfers into and/or out of level 3000105
Fair Value, Ending Balance22,06914,47822,06914,478
Change in unrealized gains/(losses) related to financial instruments(459)121(459)(1)
Asset backed security [Member]
    
Assets    
Fair Value, Beginning balance15,40212,33413,77512,732
Total realized/ unrealized gains/(losses)(453)102128(3)
Purchases9,349 11,309 
Sales(1,392) (1,418) 
Issuances0 0 
Settlements(1,376) (2,264) 
Purchases, issuances, settlements, net 1,536 1,243
Transfers into and/or out of level 30000
Fair Value, Ending Balance21,53013,97221,53013,972
Change in unrealized gains/(losses) related to financial instruments(457)101(459)(21)
Other available-for-sale securities [Member]
    
Assets    
Fair Value, Beginning balance501410512461
Total realized/ unrealized gains/(losses)(2)20(1)(47)
Purchases57 57 
Sales0 (3) 
Issuances0 0 
Settlements(17) (26) 
Purchases, issuances, settlements, net 76 (13)
Transfers into and/or out of level 3000105
Fair Value, Ending Balance539506539506
Change in unrealized gains/(losses) related to financial instruments(2)20020
Loans [Member]
    
Assets    
Fair Value, Beginning balance1,4721,0651,466990
Total realized/ unrealized gains/(losses)16710442793
Purchases120 245 
Sales(9) (9) 
Issuances0 0 
Settlements(151) (514) 
Purchases, issuances, settlements, net 56 134
Transfers into and/or out of level 3150(1)8
Fair Value, Ending Balance1,6141,2251,6141,225
Change in unrealized gains/(losses) related to financial instruments1639739741
Mortgage servicing rights [Member]
    
Assets    
Fair Value, Beginning balance12,24311,85313,64915,531
Total realized/ unrealized gains/(losses)(4,575)(1,497)(6,286)(5,177)
Purchases624 1,973 
Sales0 0 
Issuances0 0 
Settlements(459) (1,503) 
Purchases, issuances, settlements, net (51) (49)
Transfers into and/or out of level 30000
Fair Value, Ending Balance7,83310,3057,83310,305
Change in unrealized gains/(losses) related to financial instruments(4,575)(1,497)(6,286)(5,177)
Private equity investments [Member]
    
Assets    
Fair Value, Beginning balance8,0227,2467,8626,563
Total realized/ unrealized gains/(losses)(469)8271,213963
Purchases49 846 
Sales(691) (2,736) 
Issuances0 0 
Settlements(156) (430) 
Purchases, issuances, settlements, net 236 1,167
Transfers into and/or out of level 3(166)(107)(166)(491)
Fair Value, Ending Balance6,5898,2026,5898,202
Change in unrealized gains/(losses) related to financial instruments(372)685(461)697
All other assets [Member]
    
Assets    
Fair Value, Beginning balance4,4494,3084,1799,521
Total realized/ unrealized gains/(losses)(50)(71)(19)(129)
Purchases154 863 
Sales(19) (22) 
Issuances0 0 
Settlements(47) (485) 
Purchases, issuances, settlements, net 210 (4,850)
Transfers into and/or out of level 30(2)(29)(97)
Fair Value, Ending Balance4,4874,4454,4874,445
Change in unrealized gains/(losses) related to financial instruments(56)7(23)(30)
Deposits [Member]
    
Liabilities    
Beginning balance863884773476
Total realized/unrealized (gains)/losses(1)(62)(9)(67)
Purchases0 0 
Sales0 0 
Issuances29 245 
Settlements(241) (358) 
Purchases, issuances, settlements, net (84) 10
Transfers into and/or out of level 3020(1)329
Ending balance650882650882
Change in unrealized (gains)/losses related to financial instruments(11)141(16)11
Other borrowed funds [Member]
    
Liabilities    
Beginning balance2,0782911,384542
Total realized/unrealized (gains)/losses(241)(72)(267)28
Purchases0 0 
Sales0 0 
Issuances157 1,060 
Settlements(145) (330) 
Purchases, issuances, settlements, net 942 1,034
Transfers into and/or out of level 3002(243)
Ending balance1,8491,3051,8491,305
Change in unrealized (gains)/losses related to financial instruments(7)68(152)(7)
Accounts payable and other liabilities [Member]
    
Liabilities    
Beginning balance73449236355
Total realized/unrealized (gains)/losses152(62)92
Purchases0 0 
Sales0 0 
Issuances0 0 
Settlements(6) (106) 
Purchases, issuances, settlements, net (57) 77
Transfers into and/or out of level 30000
Ending balance6834068340
Change in unrealized (gains)/losses related to financial instruments147434
Beneficial interests issued by consolidated VIEs [Member]
    
Liabilities    
Beginning balance4301,392873625
Total realized/unrealized (gains)/losses10(27)356
Purchases0 0 
Sales0 0 
Issuances2 116 
Settlements(78) (660) 
Purchases, issuances, settlements, net (171) 629
Transfers into and/or out of level 3080080
Ending balance3641,3283641,328
Change in unrealized (gains)/losses related to financial instruments(4)27(36)(58)
Long-term debt [Member]
    
Liabilities    
Beginning balance13,53415,76213,04418,287
Total realized/unrealized (gains)/losses(131)784326251
Purchases0 0 
Sales0 0 
Issuances394 1,650 
Settlements(865) (2,327) 
Purchases, issuances, settlements, net (2,303) (4,190)
Transfers into and/or out of level 3209(173)448224
Ending balance13,14114,07013,14114,070
Change in unrealized (gains)/losses related to financial instruments$ 98$ 1,056$ 209$ 386