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, 2011
Dec. 31, 2010
Dec. 31, 2009
Trading Securities [Member] | Securities (Assets) [Member]
      
Assets:      
Balance, beginning of period $ 2,603 $ 2,040  
Net income 58 503  
Net gains included in other comprehensive income 0 0  
Purchases, sales, issuances and settlements, net (541) 375  
Transfers into Level 3 83 21  
Transfers out of Level 3 (169) (336)  
Balance, end of period 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 (13) 76  
Trading Securities [Member] | US States and Political Subdivisions [Member]
      
Assets:      
Balance, beginning of period 5 5  
Net income 3 2  
Net gains included in other comprehensive income 0 0  
Purchases, sales, issuances and settlements, net 12 (11)  
Transfers into Level 3 51 9  
Transfers out of Level 3 (18) 0  
Balance, end of period 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 1  
Trading Securities [Member] | Mortgage Backed Securities [Member]
      
Assets:      
Balance, beginning of period 117 146  
Net income 6 (7)  
Net gains included in other comprehensive income 0 0  
Purchases, sales, issuances and settlements, net (36) 101  
Transfers into Level 3 31 0  
Transfers out of Level 3 (10) (123)  
Balance, end of period 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 (4) (17)  
Trading Securities [Member] | Collateralized debt obligations [Member]
      
Assets:      
Balance, beginning of period 1,915 1,133  
Net income (24) 418  
Net gains included in other comprehensive income 0 0  
Purchases, sales, issuances and settlements, net (297) 364  
Transfers into Level 3 0 0  
Transfers out of Level 3 (12) 0  
Balance, end of period 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 1 11  
Trading Securities [Member] | Corporate debt securities [Member]
      
Assets:      
Balance, beginning of period 166 223  
Net income 1 9  
Net gains included in other comprehensive income 0 0  
Purchases, sales, issuances and settlements, net (70) 67  
Transfers into Level 3 0 9  
Transfers out of Level 3 0 (142)  
Balance, end of period 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 (80) 16  
Trading Securities [Member] | Total asset-backed securities [Member]
      
Assets:      
Balance, beginning of period 366 497  
Net income 75 80  
Net gains included in other comprehensive income 0 0  
Purchases, sales, issuances and settlements, net (122) (141)  
Transfers into Level 3 0 1  
Transfers out of Level 3 (129) (71)  
Balance, end of period 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 (2) 67  
Trading Securities [Member] | Equity Securities [Member]
      
Assets:      
Balance, beginning of period 34 36  
Net income (3) 1  
Net gains included in other comprehensive income 0 0  
Purchases, sales, issuances and settlements, net (28) (5)  
Transfers into Level 3 1 2  
Transfers out of Level 3 0 0  
Balance, end of period 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 72 (2)  
Trading assets (excluding derivatives) [Member]
      
Assets:      
Balance, beginning of period 2,739 2,311 3,495
Net income 37 468 202
Net gains included in other comprehensive income 0 0 2
Purchases, sales, issuances and settlements, net (539) 356 (1,749)
Transfers into Level 3 83 21  
Transfers out of Level 3 (171) (417)  
Net transfers into and/or out of Level 3     361
Balance, end of period 2,149 2,739 2,311
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end 1 86 276
Trading assets (excluding derivatives) [Member] | Other Trading Assets [Member]
      
Assets:      
Balance, beginning of period 136 271  
Net income (21) (35)  
Net gains included in other comprehensive income 0 0  
Purchases, sales, issuances and settlements, net 2 (19)  
Transfers into Level 3 0 0  
Transfers out of Level 3 (2) (81)  
Balance, end of period 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 14 10  
Mortgages held for sale [Member]
      
Assets:      
Balance, beginning of period 3,305 3,523 4,718
Net income 44 43 (96)
Net gains included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net (104) (253) (921)
Transfers into Level 3 492 380  
Transfers out of Level 3 (327) (388)  
Net transfers into and/or out of Level 3     (178)
Balance, end of period 3,410 3,305 3,523
Net unrealized gains (losses) included in mortgage banking and other noninterest income in the income statement related to assets held at period end 43 39 (109)
Loans [Member]
      
Assets:      
Balance, beginning of period 309 0  
Net income 13 55  
Net gains included in other comprehensive income 0 0  
Purchases, sales, issuances and settlements, net (299) (112)  
Transfers into Level 3 0 1,035  
Transfers out of Level 3 0 (669)  
Balance, end of period 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 0 55  
Mortgage servicing rights [Member]
      
Assets:      
Balance, beginning of period 14,467 16,004 14,714
Net income (5,821) (5,511) (4,970)
Net gains included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net 3,957 4,092 6,260
Transfers into Level 3 0 0  
Transfers out of Level 3 0 (118)  
Net transfers into and/or out of Level 3     0
Balance, end of period 12,603 14,467 16,004
Net unrealized gains (losses) included in mortgage banking and other noninterest income in the income statement related to assets held at period end (3,680) (2,957) (1,534)
Derivatives [Member]
      
Assets and Liabilities:      
Balance, beginning of period (1,192) (832) 37
Net income 3,233 2,759 1,439
Net gains included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net (3,524) (3,338) (2,291)
Transfers into Level 3 (9) 165  
Transfers out of Level 3 (96) 54  
Net transfers into and/or out of Level 3     (17)
Balance, end of period (1,588) (1,192) (832)
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 396 (930) (799)
Derivatives [Member] | Interest Rate Contract [Member]
      
Assets and Liabilities:      
Balance, beginning of period 77 (114)  
Net income 4,051 3,514  
Net gains included in other comprehensive income 0 0  
Purchases, sales, issuances and settlements, net (3,414) (3,482)  
Transfers into Level 3 (1) 159  
Transfers out of Level 3 (104) 0  
Balance, end of period 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 309 (266)  
Derivatives [Member] | Commodity Contract [Member]
      
Assets and Liabilities:      
Balance, beginning of period (1) 0  
Net income 2 (1)  
Net gains included in other comprehensive income 0 0  
Purchases, sales, issuances and settlements, net (9) 0  
Transfers into Level 3 (3) 0  
Transfers out of Level 3 11 0  
Balance, end of period 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 1 (1)  
Derivatives [Member] | Equity Contract [Member]
      
Assets and Liabilities:      
Balance, beginning of period (225) (344)  
Net income 126 (104)  
Net gains included in other comprehensive income 0 0  
Purchases, sales, issuances and settlements, net 28 169  
Transfers into Level 3 (6) 0  
Transfers out of Level 3 2 54  
Balance, end of period (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 55 (19)  
Derivatives [Member] | Foreign Exchange Contract [Member]
      
Assets and Liabilities:      
Balance, beginning of period 9 (1)  
Net income (8) 21  
Net gains included in other comprehensive income 0 0  
Purchases, sales, issuances and settlements, net (6) (11)  
Transfers into Level 3 1 0  
Transfers out of Level 3 (3) 0  
Balance, end of period (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 (19) 0  
Derivatives [Member] | Credit Contract [Member]
      
Assets and Liabilities:      
Balance, beginning of period (1,017) (330)  
Net income (856) (675)  
Net gains included in other comprehensive income 0 0  
Purchases, sales, issuances and settlements, net (123) (18)  
Transfers into Level 3 0 6  
Transfers out of Level 3 (2) 0  
Balance, end of period (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 50 (644)  
Derivatives [Member] | Other Contract [Member]
      
Assets and Liabilities:      
Balance, beginning of period (35) (43)  
Net income (82) 4  
Net gains included in other comprehensive income 0 0  
Purchases, sales, issuances and settlements, net 0 4  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Balance, end of period (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  
Other Assets [Member]
      
Assets:      
Balance, beginning of period 314 1,373 1,231
Net income 12 29 10
Net gains included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net (82) (103) 132
Transfers into Level 3 0 4  
Transfers out of Level 3 0 (989)  
Net transfers into and/or out of Level 3     0
Balance, end of period 244 314 1,373
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end 3 (38) 12
Short sale liabilities [Member]
      
Liabilities:      
Balance, beginning of period 0    
Net income 0    
Net gains 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   (26)  
Net income   (2)  
Net gains included in other comprehensive income   0  
Purchases, sales, issuances and settlements, net   (37)  
Transfers into Level 3   0  
Transfers out of Level 3   65  
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  
Other Liabilities Excluding Derivatives And Short Sale Liabilities [Member]
      
Liabilities:      
Balance, beginning of period (344) (10)  
Net income (8) (55)  
Net gains included in other comprehensive income 0 0  
Purchases, sales, issuances and settlements, net 308 94  
Transfers into Level 3 0 (1,038)  
Transfers out of Level 3 0 665  
Balance, end of period (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 (58)  
Other Liabilities Excluding Derivatives [Member]
      
Liabilities:      
Balance, beginning of period     (16)
Net income     (11)
Net gains included in other comprehensive income     0
Purchases, sales, issuances and settlements, net     1
Net transfers into and/or out of Level 3     (10)
Balance, end of period     (36)
Net unrealized gains (losses) included in mortgage banking and other noninterest income in the income statement related to liabilities held at period end     14
Available for sale Securities [Member] | Securities (Assets) [Member]
      
Assets:      
Balance, beginning of period 21,958 22,773 22,692
Net income 568 346 97
Net gains included in other comprehensive income (242) 370 4,134
Purchases, sales, issuances and settlements, net 9,873 2,818 (153)
Transfers into Level 3 502 2,472  
Transfers out of Level 3 (803) (6,821)  
Net transfers into and/or out of Level 3     (3,997)
Balance, end of period 31,856 21,958 22,773
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 (143) (40) (526)
Available for sale Securities [Member] | Debt Securities [Member]
      
Assets:      
Balance, beginning of period 19,492 20,380 19,867
Net income 408 246 (7)
Net gains included in other comprehensive income (236) 396 3,992
Purchases, sales, issuances and settlements, net 11,126 2,833 507
Transfers into Level 3 500 2,378  
Transfers out of Level 3 (801) (6,741)  
Net transfers into and/or out of Level 3     (3,979)
Balance, end of period 30,489 19,492 20,380
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end (90) (40) (525)
Available for sale Securities [Member] | US States and Political Subdivisions [Member]
      
Assets:      
Balance, beginning of period 4,564 818 903
Net income 10 12 23
Net gains included in other comprehensive income 52 63 0
Purchases, sales, issuances and settlements, net 6,923 3,485 25
Transfers into Level 3 0 192  
Transfers out of Level 3 (33) (6)  
Net transfers into and/or out of Level 3     (133)
Balance, end of period 11,516 4,564 818
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end 9 4 (8)
Available for sale Securities [Member] | Mortgage Backed Securities [Member]
      
Assets:      
Balance, beginning of period 237 2,883 3,800
Net income (53) (21) (294)
Net gains included in other comprehensive income 58 383 1,986
Purchases, sales, issuances and settlements, net (4) (58) (718)
Transfers into Level 3 123 501  
Transfers out of Level 3 (68) (3,451)  
Net transfers into and/or out of Level 3     (1,891)
Balance, end of period 293 237 2,883
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end (64) (13) (339)
Available for sale Securities [Member] | Federal agencies [Member]
      
Assets:      
Balance, beginning of period     4
Net income     0
Net gains included in other comprehensive income     0
Purchases, sales, issuances and settlements, net     0
Net transfers into and/or out of Level 3     (4)
Balance, end of period     0
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end     0
Available for sale Securities [Member] | Residential [Member]
      
Assets:      
Balance, beginning of period 20 1,084 3,510
Net income (9) 7 (74)
Net gains included in other comprehensive income (1) (21) 1,092
Purchases, sales, issuances and settlements, net (6) (48) (759)
Transfers into Level 3 121 274  
Transfers out of Level 3 (64) (1,276)  
Net transfers into and/or out of Level 3     (2,685)
Balance, end of period 61 20 1,084
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end (8) (8) (227)
Available for sale Securities [Member] | Commercial [Member]
      
Assets:      
Balance, beginning of period 217 1,799 286
Net income (44) (28) (220)
Net gains included in other comprehensive income 59 404 894
Purchases, sales, issuances and settlements, net 2 (10) 41
Transfers into Level 3 2 227  
Transfers out of Level 3 (4) (2,175)  
Net transfers into and/or out of Level 3     798
Balance, end of period 232 217 1,799
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end (56) (5) (112)
Available for sale Securities [Member] | Collateralized debt obligations [Member]
      
Assets:      
Balance, beginning of period 4,778 3,725 2,083
Net income 290 210 125
Net gains included in other comprehensive income (202) 96 577
Purchases, sales, issuances and settlements, net 3,725 959 623
Transfers into Level 3 8 0  
Transfers out of Level 3 0 (212)  
Net transfers into and/or out of Level 3     317
Balance, end of period 8,599 4,778 3,725
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end 0 (14) (84)
Available for sale Securities [Member] | Corporate debt securities [Member]
      
Assets:      
Balance, beginning of period 433 367 282
Net income 150 7 3
Net gains included in other comprehensive income (112) 68 61
Purchases, sales, issuances and settlements, net (185) (113) (7)
Transfers into Level 3 41 259  
Transfers out of Level 3 (32) (155)  
Net transfers into and/or out of Level 3     28
Balance, end of period 295 433 367
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end (3) 0 0
Available for sale Securities [Member] | Total asset-backed securities [Member]
      
Assets:      
Balance, beginning of period 9,395 12,510  
Net income 11 53  
Net gains included in other comprehensive income (32) (225)  
Purchases, sales, issuances and settlements, net 752 (1,452)  
Transfers into Level 3 328 1,426  
Transfers out of Level 3 (668) (2,917)  
Balance, end of period 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 (32) (17)  
Available for sale Securities [Member] | Auto loans and leases [Member]
      
Assets:      
Balance, beginning of period 6,133 8,525  
Net income 4 1  
Net gains included in other comprehensive income (27) (246)  
Purchases, sales, issuances and settlements, net 531 (2,403)  
Transfers into Level 3 0 256  
Transfers out of Level 3 0 0  
Balance, end of period 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  
Available for sale Securities [Member] | Home Equity Loans [Member]
      
Assets:      
Balance, beginning of period 112 1,677  
Net income (3) 1  
Net gains included in other comprehensive income (18) 40  
Purchases, sales, issuances and settlements, net 40 48  
Transfers into Level 3 221 113  
Transfers out of Level 3 (70) (1,767)  
Balance, end of period 282 112  
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end (25) (5)  
Available for sale Securities [Member] | Other asset-backed securities [Member]
      
Assets:      
Balance, beginning of period 3,150 2,308  
Net income 10 51  
Net gains included in other comprehensive income 13 (19)  
Purchases, sales, issuances and settlements, net 181 903  
Transfers into Level 3 107 1,057  
Transfers out of Level 3 (598) (1,150)  
Balance, end of period 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 (7) (12)  
Available for sale Securities [Member] | Other Debt Securities [Member]
      
Assets:      
Balance, beginning of period     12,799
Net income     136
Net gains included in other comprehensive income     1,368
Purchases, sales, issuances and settlements, net     584
Net transfers into and/or out of Level 3     (2,300)
Balance, end of period     12,587
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end     (94)
Available for sale Securities [Member] | Other Debt Securities, Excluding Asset Backed Securities [Member]
      
Assets:      
Balance, beginning of period 85 77  
Net income 0 (15)  
Net gains 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 2,466 2,393 2,825
Net income 160 100 104
Net gains included in other comprehensive income (6) (26) 142
Purchases, sales, issuances and settlements, net (1,253) (15) (660)
Transfers into Level 3 2 94  
Transfers out of Level 3 (2) (80)  
Net transfers into and/or out of Level 3     (18)
Balance, end of period 1,367 2,466 2,393
Net unrealized gains (losses) included in equity investments in the income statement related to assets held at period end (53) 0 (1)
Available for sale Securities [Member] | Perpetual preferred securities [Member]
      
Assets:      
Balance, beginning of period 2,434 2,305 2,775
Net income 160 100 104
Net gains included in other comprehensive income (7) (31) 144
Purchases, sales, issuances and settlements, net (1,243) 6 (723)
Transfers into Level 3 2 80  
Transfers out of Level 3 (2) (26)  
Net transfers into and/or out of Level 3     5
Balance, end of period 1,344 2,434 2,305
Net unrealized gains (losses) included in equity investments in the income statement related to assets held at period end (53) 0 (1)
Available for sale Securities [Member] | Other equity securities [Member]
      
Assets:      
Balance, beginning of period 32 88 50
Net income 0 0 0
Net gains included in other comprehensive income 1 5 (2)
Purchases, sales, issuances and settlements, net (10) (21) 63
Transfers into Level 3 0 14  
Transfers out of Level 3 0 (54)  
Net transfers into and/or out of Level 3     (23)
Balance, end of period 23 32 88
Net unrealized gains (losses) included in equity investments in the income statement related to assets held at period end $ 0 $ 0 $ 0