v2.4.0.6
Fair Value, Assets and Liabilities Measured on Recurring Basis Level 3 Reconciliation (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Trading Securities [Member]
    
Assets:    
Balance, beginning of period $ 2,034 $ 2,603
Net income 27 26
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net (70) 4
Transfers into Level 3 14 43
Transfers out of Level 3 (10) (111)
Balance, end of period 1,995 2,565
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end (13) (5)
Trading Securities [Member] | US States and Political Subdivisions [Member]
    
Assets:    
Balance, beginning of period 53 5
Net income 0 2
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net 50 85
Transfers into Level 3 0 38
Transfers out of Level 3 0 0
Balance, end of period 103 130
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 108 117
Net income (1) 5
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net (43) 18
Transfers into Level 3 0 4
Transfers out of Level 3 (10) 0
Balance, end of period 54 144
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end (3) (3)
Trading Securities [Member] | Collateralized debt obligations [Member]
    
Assets:    
Balance, beginning of period 1,582 1,915
Net income 17 13
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net (60) (17)
Transfers into Level 3 0 0
Transfers out of Level 3 0 (1)
Balance, end of period 1,539 1,910
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end (12) (10)
Trading Securities [Member] | Corporate debt securities [Member]
    
Assets:    
Balance, beginning of period 97 166
Net income 0 (2)
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net 35 (67)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period 132 97
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end (2) 0
Trading Securities [Member] | Total asset-backed securities [Member]
    
Assets:    
Balance, beginning of period 190 366
Net income 11 9
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net (51) (13)
Transfers into Level 3 14 0
Transfers out of Level 3 0 (110)
Balance, end of period 164 252
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end 4 9
Trading Securities [Member] | Equity Securities [Member]
    
Assets:    
Balance, beginning of period 4 34
Net income 0 (1)
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net (1) (2)
Transfers into Level 3 0 1
Transfers out of Level 3 0 0
Balance, end of period 3 32
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end 0 (2)
Trading assets (excluding derivatives) [Member]
    
Assets:    
Balance, beginning of period 2,149 2,739
Net income 20 32
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net (70) 6
Transfers into Level 3 14 43
Transfers out of Level 3 (10) (111)
Balance, end of period 2,103 2,709
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end (13) 12
Trading assets (excluding derivatives) [Member] | Other Trading Assets [Member]
    
Assets:    
Balance, beginning of period 115 136
Net income (7) 6
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net 0 2
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period 108 144
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end 0 17
Mortgages held for sale [Member]
    
Assets:    
Balance, beginning of period 3,410 3,305
Net income (35) (32)
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net (46) 42
Transfers into Level 3 87 72
Transfers out of Level 3 (86) (73)
Balance, end of period 3,330 3,314
Net unrealized gains (losses) included in mortgage banking and other noninterest income in the income statement related to assets held at period end (36) (32)
Loans [Member]
    
Assets:    
Balance, beginning of period 23 309
Net income 0 10
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net 2 (221)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period 25 98
Net unrealized gains (losses) included in mortgage banking and other noninterest income in the income statement related to assets held at period end 0 10
Mortgage servicing rights [Member]
    
Assets:    
Balance, beginning of period 12,603 14,467
Net income (801) (81)
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net 1,776 1,262
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period 13,578 15,648
Net unrealized gains (losses) included in mortgage banking and other noninterest income in the income statement related to assets held at period end (158) 499
Derivatives [Member]
    
Assets and Liabilities:    
Balance, beginning of period (1,588) (1,192)
Net income 1,313 358
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net (1,367) (233)
Transfers into Level 3 (8) (2)
Transfers out of Level 3 (12) (6)
Balance, end of period (1,662) (1,075)
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 361 (102)
Derivatives [Member] | Interest Rate Contract [Member]
    
Assets and Liabilities:    
Balance, beginning of period 609 77
Net income 1,158 406
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net (1,432) (185)
Transfers into Level 3 0 1
Transfers out of Level 3 0 0
Balance, end of period 335 299
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 199 (9)
Derivatives [Member] | Commodity Contract [Member]
    
Assets and Liabilities:    
Balance, beginning of period 0 (1)
Net income 1 0
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net (7) 1
Transfers into Level 3 (8) (3)
Transfers out of Level 3 0 0
Balance, end of period (14) (3)
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 (7) 0
Derivatives [Member] | Equity Contract [Member]
    
Assets and Liabilities:    
Balance, beginning of period (75) (225)
Net income (95) 0
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net 3 6
Transfers into Level 3 0 0
Transfers out of Level 3 (13) (6)
Balance, end of period (180) (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 (88) 29
Derivatives [Member] | Foreign Exchange Contract [Member]
    
Assets and Liabilities:    
Balance, beginning of period (7) 9
Net income 27 21
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net (5) (7)
Transfers into Level 3 0 0
Transfers out of Level 3 1 0
Balance, end of period 16 23
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 24 11
Derivatives [Member] | Credit Contract [Member]
    
Assets and Liabilities:    
Balance, beginning of period (1,998) (1,017)
Net income 171 (86)
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net 74 (48)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period (1,753) (1,151)
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 233 (133)
Derivatives [Member] | Other Contract [Member]
    
Assets and Liabilities:    
Balance, beginning of period (117) (35)
Net income 51 17
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period (66) (18)
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 244 314
Net income (3) 2
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net (13) (5)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period 228 311
Net unrealized gains (losses) included in trading activities and other noninterest income in the income statement related to assets held at period end (11) 4
Short sale liabilities [Member] | Corporate debt securities [Member]
    
Liabilities:    
Balance, beginning of period   0
Net income   1
Net gains included in other comprehensive income   0
Purchases, sales, issuances and settlements, net   (107)
Transfers into Level 3   0
Transfers out of Level 3   0
Balance, end of period   (106)
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 (44) (344)
Net income 1 (9)
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net 1 217
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period (42) (136)
Net unrealized gains (losses) included in mortgage banking and other noninterest income in the income statement related to liabilities held at period end 0 (10)
Available for sale Securities [Member]
    
Assets:    
Balance, beginning of period 31,856 21,958
Net income 85 115
Net gains included in other comprehensive income 469 323
Purchases, sales, issuances and settlements, net 1,130 (1,211)
Transfers into Level 3 43 66
Transfers out of Level 3 (93) (43)
Balance, end of period 33,490 21,208
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 (6) (3)
Available for sale Securities [Member] | Debt Securities [Member]
    
Assets:    
Balance, beginning of period 30,489 19,492
Net income 54 47
Net gains included in other comprehensive income 476 317
Purchases, sales, issuances and settlements, net 1,345 (695)
Transfers into Level 3 43 66
Transfers out of Level 3 (93) (43)
Balance, end of period 32,314 19,184
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end (6) (3)
Available for sale Securities [Member] | US States and Political Subdivisions [Member]
    
Assets:    
Balance, beginning of period 11,516 4,564
Net income (4) 2
Net gains included in other comprehensive income 164 69
Purchases, sales, issuances and settlements, net 838 395
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period 12,514 5,030
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end (6) 3
Available for sale Securities [Member] | Mortgage Backed Securities [Member]
    
Assets:    
Balance, beginning of period 293 237
Net income (15) (8)
Net gains included in other comprehensive income 23 69
Purchases, sales, issuances and settlements, net (8) 4
Transfers into Level 3 27 6
Transfers out of Level 3 (30) (17)
Balance, end of period 290 291
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end 0 (5)
Available for sale Securities [Member] | Residential [Member]
    
Assets:    
Balance, beginning of period 61 20
Net income 0 0
Net gains included in other comprehensive income 1 (1)
Purchases, sales, issuances and settlements, net (1) 2
Transfers into Level 3 27 6
Transfers out of Level 3 (30) (17)
Balance, end of period 58 10
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end 0 (1)
Available for sale Securities [Member] | Commercial [Member]
    
Assets:    
Balance, beginning of period 232 217
Net income (15) (8)
Net gains included in other comprehensive income 22 70
Purchases, sales, issuances and settlements, net (7) 2
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period 232 281
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end 0 (4)
Available for sale Securities [Member] | Collateralized debt obligations [Member]
    
Assets:    
Balance, beginning of period 8,599 4,778
Net income 57 53
Net gains included in other comprehensive income 183 153
Purchases, sales, issuances and settlements, net 324 632
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period 9,163 5,616
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] | Corporate debt securities [Member]
    
Assets:    
Balance, beginning of period 295 433
Net income 5 2
Net gains included in other comprehensive income 11 9
Purchases, sales, issuances and settlements, net (4) 49
Transfers into Level 3 1 1
Transfers out of Level 3 0 0
Balance, end of period 308 494
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] | Total asset-backed securities [Member]
    
Assets:    
Balance, beginning of period 9,786 9,395
Net income 11 (2)
Net gains included in other comprehensive income 95 17
Purchases, sales, issuances and settlements, net 195 (1,690)
Transfers into Level 3 15 59
Transfers out of Level 3 (63) (26)
Balance, end of period 10,039 7,753
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end 0 (1)
Available for sale Securities [Member] | Auto loans and leases [Member]
    
Assets:    
Balance, beginning of period 6,641 6,133
Net income 1 1
Net gains included in other comprehensive income 20 (39)
Purchases, sales, issuances and settlements, net 251 (1,851)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period 6,913 4,244
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 282 112
Net income 7 2
Net gains included in other comprehensive income 18 1
Purchases, sales, issuances and settlements, net (1) (1)
Transfers into Level 3 14 10
Transfers out of Level 3 (63) (26)
Balance, end of period 257 98
Net unrealized gains (losses) included in debt securities available for sale in the income statement related to assets held at period end 0 (1)
Available for sale Securities [Member] | Other asset-backed securities [Member]
    
Assets:    
Balance, beginning of period 2,863 3,150
Net income 3 (5)
Net gains included in other comprehensive income 57 55
Purchases, sales, issuances and settlements, net (55) 162
Transfers into Level 3 1 49
Transfers out of Level 3 0 0
Balance, end of period 2,869 3,411
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] | Other Debt Securities, Excluding Asset Backed Securities [Member]
    
Assets:    
Balance, beginning of period 0 85
Net income 0 0
Net gains included in other comprehensive income 0 0
Purchases, sales, issuances and settlements, net 0 (85)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period 0 0
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
Net income 31 68
Net gains included in other comprehensive income (7) 6
Purchases, sales, issuances and settlements, net (215) (516)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period 1,176 2,024
Net unrealized gains (losses) included in equity investments in the income statement related to assets held at period end 0 0
Available for sale Securities [Member] | Perpetual preferred securities [Member]
    
Assets:    
Balance, beginning of period 1,344 2,434
Net income 31 68
Net gains included in other comprehensive income 8 6
Purchases, sales, issuances and settlements, net (210) (519)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period 1,173 1,989
Net unrealized gains (losses) included in equity investments in the income statement related to assets held at period end 0 0
Available for sale Securities [Member] | Other equity securities [Member]
    
Assets:    
Balance, beginning of period 23 32
Net income 0 0
Net gains included in other comprehensive income (15) 0
Purchases, sales, issuances and settlements, net (5) 3
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period 3 35
Net unrealized gains (losses) included in equity investments in the income statement related to assets held at period end $ 0 $ 0