v2.4.0.6
Fair Value, Assets and Liabilities Measured on Recurring Basis Level 3 Reconciliation (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Trading Securities [Member]
      
Assets:      
Balance, beginning of period $ 2,034 $ 2,603 $ 2,040
Net gains (losses) included in net income (132) 58 503
Net gains (losses) included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net (913) (541) 375
Transfers into Level 3 14 83 21
Transfers out of Level 3 (16) (169) (336)
Balance, end of period 987 2,034 2,603
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end (25) (13) 76
Trading Securities [Member] | US States and Political Subdivisions [Member]
      
Assets:      
Balance, beginning of period 53 5 5
Net gains (losses) included in net income 3 3 2
Net gains (losses) included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net (10) 12 (11)
Transfers into Level 3 0 51 9
Transfers out of Level 3 0 (18) 0
Balance, end of period 46 53 5
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end 0 0 1
Trading Securities [Member] | Mortgage Backed Securities [Member]
      
Assets:      
Balance, beginning of period 108 117 146
Net gains (losses) included in net income 8 6 (7)
Net gains (losses) included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net (110) (36) 101
Transfers into Level 3 0 31 0
Transfers out of Level 3 0 (10) (123)
Balance, end of period 6 108 117
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end 2 (4) (17)
Trading Securities [Member] | Collateralized debt obligations [Member]
      
Assets:      
Balance, beginning of period 1,582 1,915 1,133
Net gains (losses) included in net income (191) (24) 418
Net gains (losses) included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net (649) (297) 364
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 (12) 0
Balance, end of period 742 1,582 1,915
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end (47) 1 11
Trading Securities [Member] | Corporate debt securities [Member]
      
Assets:      
Balance, beginning of period 97 166 223
Net gains (losses) included in net income 0 1 9
Net gains (losses) included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net (45) (70) 67
Transfers into Level 3 0 0 9
Transfers out of Level 3 0 0 (142)
Balance, end of period 52 97 166
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end (3) (80) 16
Trading Securities [Member] | Total asset-backed securities [Member]
      
Assets:      
Balance, beginning of period 190 366 497
Net gains (losses) included in net income 48 75 80
Net gains (losses) included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net (98) (122) (141)
Transfers into Level 3 14 0 1
Transfers out of Level 3 (16) (129) (71)
Balance, end of period 138 190 366
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end 23 (2) 67
Trading Securities [Member] | Equity Securities [Member]
      
Assets:      
Balance, beginning of period 4 34 36
Net gains (losses) included in net income 0 (3) 1
Net gains (losses) included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net (1) (28) (5)
Transfers into Level 3 0 1 2
Transfers out of Level 3 0 0 0
Balance, end of period 3 4 34
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end 0 72 (2)
Trading assets (excluding derivatives) [Member]
      
Assets:      
Balance, beginning of period 2,149 2,739 2,311
Net gains (losses) included in net income (171) 37 468
Net gains (losses) included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net (913) (539) 356
Transfers into Level 3 14 83 21
Transfers out of Level 3 (16) (171) (417)
Balance, end of period 1,063 2,149 2,739
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end (44) 1 86
Trading assets (excluding derivatives) [Member] | Trading Account Assets Other [Member]
      
Assets:      
Balance, beginning of period 115 136 271
Net gains (losses) included in net income (39) (21) (35)
Net gains (losses) included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net 0 2 (19)
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 (2) (81)
Balance, end of period 76 115 136
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end (19) 14 10
Mortgages held for sale [Member]
      
Assets:      
Balance, beginning of period 3,410 3,305 3,523
Net gains (losses) included in net income (42) 44 43
Net gains (losses) included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net (308) (104) (253)
Transfers into Level 3 488 492 380
Transfers out of Level 3 (298) (327) (388)
Balance, end of period 3,250 3,410 3,305
Net unrealized gains (losses) included in mortgage banking and other noninterest income in the income statement related to assets held at period end (30) 43 39
Loans Receivable [Member]
      
Assets:      
Balance, beginning of period 23 309 0
Net gains (losses) included in net income 43 13 55
Net gains (losses) included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net 145 (299) (112)
Transfers into Level 3 5,851 0 1,035
Transfers out of Level 3 (41) 0 (669)
Balance, end of period 6,021 23 309
Net unrealized gains (losses) included in mortgage banking and other noninterest income in the income statement related to assets held at period end 43 0 55
Mortgage servicing rights [Member]
      
Assets:      
Balance, beginning of period 12,603 14,467 16,004
Net gains (losses) included in net income (5,954) (5,821) (5,511)
Net gains (losses) included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net 4,889 3,957 4,092
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 0 (118)
Balance, end of period 11,538 12,603 14,467
Net unrealized gains (losses) included in mortgage banking and other noninterest income in the income statement related to assets held at period end (2,893) (3,680) (2,957)
Derivatives [Member]
      
Assets and Liabilities:      
Balance, beginning of period (1,588) (1,192) (832)
Net gains (losses) included in net income 7,565 3,233 2,759
Net gains (losses) included in other comprehensive income (1) 0 0
Purchases, sales, issuances and settlements, net (6,566) (3,524) (3,338)
Transfers into Level 3 (8) (9) 165
Transfers out of Level 3 (51) (96) 54
Balance, end of period (649) (1,588) (1,192)
Net unrealized gains (losses) included in mortgage banking, trading activities and other noninterest income in the income statement related to assets and liabilities held at period end 657 396 (930)
Derivatives [Member] | Interest Rate Contract [Member]
      
Assets and Liabilities:      
Balance, beginning of period 609 77 (114)
Net gains (losses) included in net income 7,397 4,051 3,514
Net gains (losses) included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net (7,349) (3,414) (3,482)
Transfers into Level 3 0 (1) 159
Transfers out of Level 3 2 (104) 0
Balance, end of period 659 609 77
Net unrealized gains (losses) included in mortgage banking, trading activities and other noninterest income in the income statement related to assets and liabilities held at period end 562 309 (266)
Derivatives [Member] | Commodity Contract [Member]
      
Assets and Liabilities:      
Balance, beginning of period 0 (1) 0
Net gains (losses) included in net income 78 2 (1)
Net gains (losses) included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net (50) (9) 0
Transfers into Level 3 (8) (3) 0
Transfers out of Level 3 1 11 0
Balance, end of period 21 0 (1)
Net unrealized gains (losses) included in mortgage banking, trading activities and other noninterest income in the income statement related to assets and liabilities held at period end 40 1 (1)
Derivatives [Member] | Equity Contract [Member]
      
Assets and Liabilities:      
Balance, beginning of period (75) (225) (344)
Net gains (losses) included in net income (11) 126 (104)
Net gains (losses) included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net 18 28 169
Transfers into Level 3 0 (6) 0
Transfers out of Level 3 (54) 2 54
Balance, end of period (122) (75) (225)
Net unrealized gains (losses) included in mortgage banking, trading activities and other noninterest income in the income statement related to assets and liabilities held at period end (16) 55 (19)
Derivatives [Member] | Foreign Exchange Contract [Member]
      
Assets and Liabilities:      
Balance, beginning of period (7) 9 (1)
Net gains (losses) included in net income 23 (8) 21
Net gains (losses) included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net 5 (6) (11)
Transfers into Level 3 0 1 0
Transfers out of Level 3 0 (3) 0
Balance, end of period 21 (7) 9
Net unrealized gains (losses) included in mortgage banking, trading activities and other noninterest income in the income statement related to assets and liabilities held at period end 30 (19) 0
Derivatives [Member] | Credit Contract [Member]
      
Assets and Liabilities:      
Balance, beginning of period (1,998) (1,017) (330)
Net gains (losses) included in net income 38 (856) (675)
Net gains (losses) included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net 810 (123) (18)
Transfers into Level 3 0 0 6
Transfers out of Level 3 0 (2) 0
Balance, end of period (1,150) (1,998) (1,017)
Net unrealized gains (losses) included in mortgage banking, trading activities and other noninterest income in the income statement related to assets and liabilities held at period end 41 50 (644)
Derivatives [Member] | Other Contract [Member]
      
Assets and Liabilities:      
Balance, beginning of period (117) (35) (43)
Net gains (losses) included in net income 40 (82) 4
Net gains (losses) included in other comprehensive income (1) 0 0
Purchases, sales, issuances and settlements, net 0 0 4
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 0 0
Balance, end of period (78) (117) (35)
Net unrealized gains (losses) included in mortgage banking, trading activities and other noninterest income in the income statement related to assets and liabilities held at period end 0 0 0
Other Assets [Member]
      
Assets:      
Balance, beginning of period 244 314 1,373
Net gains (losses) included in net income (21) 12 29
Net gains (losses) included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net (61) (82) (103)
Transfers into Level 3 0 0 4
Transfers out of Level 3 0 0 (989)
Balance, end of period 162 244 314
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end (8) 3 (38)
Short sale liabilities [Member]
      
Liabilities:      
Balance, beginning of period 0    
Net gains (losses) included in net income 0    
Net gains (losses) included in other comprehensive income 0    
Purchases, sales, issuances and settlements, net 0    
Transfers into Level 3 0    
Transfers out of Level 3 0    
Balance, end of period 0    
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to liabilities held at period end 0    
Short sale liabilities [Member] | Corporate debt securities [Member]
      
Liabilities:      
Balance, beginning of period   0 (26)
Net gains (losses) included in net income   0 (2)
Net gains (losses) included in other comprehensive income   0 0
Purchases, sales, issuances and settlements, net   0 (37)
Transfers into Level 3   0 0
Transfers out of Level 3   0 65
Balance, end of period   0 0
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to liabilities held at period end   0 0
Other Liabilities Excluding Derivatives And Short Sale Liabilities [Member]
      
Liabilities:      
Balance, beginning of period (44) (344) (10)
Net gains (losses) included in net income (43) (8) (55)
Net gains (losses) included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net 38 308 94
Transfers into Level 3 0 0 (1,038)
Transfers out of Level 3 0 0 665
Balance, end of period (49) (44) (344)
Net unrealized gains (losses) included in mortgage banking and other noninterest income in the income statement related to liabilities held at period end 0 0 (58)
Available for sale Securities [Member]
      
Assets:      
Balance, beginning of period 31,856 21,958 22,773
Net gains (losses) included in net income 203 568 346
Net gains (losses) included in other comprehensive income 885 (242) 370
Purchases, sales, issuances and settlements, net 4,267 9,873 2,818
Transfers into Level 3 60 502 2,472
Transfers out of Level 3 (9,832) (803) (6,821)
Balance, end of period 27,439 31,856 21,958
Net unrealized gains (losses) included in debt securities available for sale and equity investments in the income statement related to assets held at period end (64) (143) (40)
Available for sale Securities [Member] | Debt Securities [Member]
      
Assets:      
Balance, beginning of period 30,489 19,492 20,380
Net gains (losses) included in net income 110 408 246
Net gains (losses) included in other comprehensive income 931 (236) 396
Purchases, sales, issuances and settlements, net 4,887 11,126 2,833
Transfers into Level 3 60 500 2,378
Transfers out of Level 3 (9,832) (801) (6,741)
Balance, end of period 26,645 30,489 19,492
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end (64) (90) (40)
Available for sale Securities [Member] | US States and Political Subdivisions [Member]
      
Assets:      
Balance, beginning of period 11,516 4,564 818
Net gains (losses) included in net income 10 10 12
Net gains (losses) included in other comprehensive income 160 52 63
Purchases, sales, issuances and settlements, net 1,347 6,923 3,485
Transfers into Level 3 0 0 192
Transfers out of Level 3 (9,402) (33) (6)
Balance, end of period 3,631 11,516 4,564
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end 0 9 4
Available for sale Securities [Member] | Mortgage Backed Securities [Member]
      
Assets:      
Balance, beginning of period 293 237 2,883
Net gains (losses) included in net income (44) (53) (21)
Net gains (losses) included in other comprehensive income 73 58 383
Purchases, sales, issuances and settlements, net 20 (4) (58)
Transfers into Level 3 29 123 501
Transfers out of Level 3 (74) (68) (3,451)
Balance, end of period 297 293 237
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end (57) (64) (13)
Available for sale Securities [Member] | Residential [Member]
      
Assets:      
Balance, beginning of period 61 20 1,084
Net gains (losses) included in net income 12 (9) 7
Net gains (losses) included in other comprehensive income 16 (1) (21)
Purchases, sales, issuances and settlements, net 50 (6) (48)
Transfers into Level 3 29 121 274
Transfers out of Level 3 (74) (64) (1,276)
Balance, end of period 94 61 20
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end (1) (8) (8)
Available for sale Securities [Member] | Commercial [Member]
      
Assets:      
Balance, beginning of period 232 217 1,799
Net gains (losses) included in net income (56) (44) (28)
Net gains (losses) included in other comprehensive income 57 59 404
Purchases, sales, issuances and settlements, net (30) 2 (10)
Transfers into Level 3 0 2 227
Transfers out of Level 3 0 (4) (2,175)
Balance, end of period 203 232 217
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end (56) (56) (5)
Available for sale Securities [Member] | Collateralized debt obligations [Member]
      
Assets:      
Balance, beginning of period 8,599 4,778 3,725
Net gains (losses) included in net income 135 290 210
Net gains (losses) included in other comprehensive income 514 (202) 96
Purchases, sales, issuances and settlements, net 3,940 3,725 959
Transfers into Level 3 0 8 0
Transfers out of Level 3 0 0 (212)
Balance, end of period 13,188 8,599 4,778
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end 0 0 (14)
Available for sale Securities [Member] | Corporate debt securities [Member]
      
Assets:      
Balance, beginning of period 295 433 367
Net gains (losses) included in net income 20 150 7
Net gains (losses) included in other comprehensive income 19 (112) 68
Purchases, sales, issuances and settlements, net (20) (185) (113)
Transfers into Level 3 1 41 259
Transfers out of Level 3 (41) (32) (155)
Balance, end of period 274 295 433
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end 0 (3) 0
Available for sale Securities [Member] | Total asset-backed securities [Member]
      
Assets:      
Balance, beginning of period 9,786 9,395 12,510
Net gains (losses) included in net income (11) 11 53
Net gains (losses) included in other comprehensive income 165 (32) (225)
Purchases, sales, issuances and settlements, net (400) 752 (1,452)
Transfers into Level 3 30 328 1,426
Transfers out of Level 3 (315) (668) (2,917)
Balance, end of period 9,255 9,786 9,395
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end (7) (32) (17)
Available for sale Securities [Member] | Auto loans and leases [Member]
      
Assets:      
Balance, beginning of period 6,641 6,133 8,525
Net gains (losses) included in net income 3 4 1
Net gains (losses) included in other comprehensive income 3 (27) (246)
Purchases, sales, issuances and settlements, net (726) 531 (2,403)
Transfers into Level 3 0 0 256
Transfers out of Level 3 0 0 0
Balance, end of period 5,921 6,641 6,133
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end 0 0 0
Available for sale Securities [Member] | Home Equity Loans [Member]
      
Assets:      
Balance, beginning of period 282 112 1,677
Net gains (losses) included in net income 15 (3) 1
Net gains (losses) included in other comprehensive income 14 (18) 40
Purchases, sales, issuances and settlements, net (3) 40 48
Transfers into Level 3 29 221 113
Transfers out of Level 3 (286) (70) (1,767)
Balance, end of period 51 282 112
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end (1) (25) (5)
Available for sale Securities [Member] | Other asset-backed securities [Member]
      
Assets:      
Balance, beginning of period 2,863 3,150 2,308
Net gains (losses) included in net income (29) 10 51
Net gains (losses) included in other comprehensive income 148 13 (19)
Purchases, sales, issuances and settlements, net 329 181 903
Transfers into Level 3 1 107 1,057
Transfers out of Level 3 (29) (598) (1,150)
Balance, end of period 3,283 2,863 3,150
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end (6) (7) (12)
Available for sale Securities [Member] | Other Debt Securities, Excluding Asset Backed Securities [Member]
      
Assets:      
Balance, beginning of period   85 77
Net gains (losses) included in net income   0 (15)
Net gains (losses) included in other comprehensive income   0 11
Purchases, sales, issuances and settlements, net   (85) 12
Transfers into Level 3   0 0
Transfers out of Level 3   0 0
Balance, end of period   0 85
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end   0 0
Available for sale Securities [Member] | Equity Securities [Member]
      
Assets:      
Balance, beginning of period 1,367 2,466 2,393
Net gains (losses) included in net income 93 160 100
Net gains (losses) included in other comprehensive income (46) (6) (26)
Purchases, sales, issuances and settlements, net (620) (1,253) (15)
Transfers into Level 3 0 2 94
Transfers out of Level 3 0 (2) (80)
Balance, end of period 794 1,367 2,466
Net unrealized gains (losses) included in equity investments in the income statement related to assets held at period end 0 (53) 0
Available for sale Securities [Member] | Perpetual preferred securities [Member]
      
Assets:      
Balance, beginning of period 1,344 2,434 2,305
Net gains (losses) included in net income 91 160 100
Net gains (losses) included in other comprehensive income (30) (7) (31)
Purchases, sales, issuances and settlements, net (611) (1,243) 6
Transfers into Level 3 0 2 80
Transfers out of Level 3 0 (2) (26)
Balance, end of period 794 1,344 2,434
Net unrealized gains (losses) included in equity investments in the income statement related to assets held at period end 0 (53) 0
Available for sale Securities [Member] | Other equity securities [Member]
      
Assets:      
Balance, beginning of period 23 32 88
Net gains (losses) included in net income 2 0 0
Net gains (losses) included in other comprehensive income (16) 1 5
Purchases, sales, issuances and settlements, net (9) (10) (21)
Transfers into Level 3 0 0 14
Transfers out of Level 3 0 0 (54)
Balance, end of period 0 23 32
Net unrealized gains (losses) included in equity investments in the income statement related to assets held at period end $ 0 $ 0 $ 0