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Loans - Impaired Loans (Details 3) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Financing Receivable, Impaired [Line Items]     
Retained loans$ 692,944$ 687,049$ 692,944$ 687,049$ 685,498
Wholesale
     
Financing Receivable, Impaired [Line Items]     
Retained loans255,799 255,799 222,510
Impaired loans3,053 3,053 5,486
Allowance for loan losses related to impaired loans670 670 1,574
Unpaid principal balance of impaired loans4,486 4,486 7,260
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)3,1775,7444,1606,107 
Wholesale | Commercial and industrial [Member]
     
Financing Receivable, Impaired [Line Items]     
Retained loans82,224 82,224 66,576
Impaired loans1,121 1,121 1,669
Allowance for loan losses related to impaired loans256 256 435
Unpaid principal balance of impaired loans1,798 1,798 2,453
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)1,2051,5441,3951,674 
Wholesale | Commercial and industrial [Member] | Impaired Financing Receivable with Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans1,018 1,018 1,512
Wholesale | Commercial and industrial [Member] | Impaired Financing Receivable with No Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans103 103 157
Wholesale | Real Estate [Member]
     
Financing Receivable, Impaired [Line Items]     
Retained loans53,596 53,596 53,635
Impaired loans1,164 1,164 2,955
Allowance for loan losses related to impaired loans209 209 825
Unpaid principal balance of impaired loans1,538 1,538 3,487
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)1,2583,2512,0343,231 
Wholesale | Real Estate [Member] | Impaired Financing Receivable with Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans850 850 2,510
Wholesale | Real Estate [Member] | Impaired Financing Receivable with No Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans314 314 445
Wholesale | Financial institutions [Member]
     
Financing Receivable, Impaired [Line Items]     
Retained loans35,505 35,505 31,458
Impaired loans60 60 135
Allowance for loan losses related to impaired loans7 7 61
Unpaid principal balance of impaired loans115 115 244
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)6222476335 
Wholesale | Financial institutions [Member] | Impaired Financing Receivable with Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans37 37 127
Wholesale | Financial institutions [Member] | Impaired Financing Receivable with No Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans23 23 8
Wholesale | Government agencies [Member]
     
Financing Receivable, Impaired [Line Items]     
Retained loans7,551 7,551 7,278
Impaired loans17 17 22
Allowance for loan losses related to impaired loans12 12 14
Unpaid principal balance of impaired loans18 18 30
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)180213 
Wholesale | Government agencies [Member] | Impaired Financing Receivable with Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans17 17 22
Wholesale | Government agencies [Member] | Impaired Financing Receivable with No Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans0 0 0
Wholesale | Wholesale Other Member
     
Financing Receivable, Impaired [Line Items]     
Retained loans76,923 76,923 63,563
Impaired loans691 691 705
Allowance for loan losses related to impaired loans186 186 239
Unpaid principal balance of impaired loans1,017 1,017 1,046
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)634725634864 
Wholesale | Wholesale Other Member | Impaired Financing Receivable with Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans645 645 697
Wholesale | Wholesale Other Member | Impaired Financing Receivable with No Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans46 46 8
Wholesale | Impaired Financing Receivable with Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans2,567 2,567 4,868
Wholesale | Impaired Financing Receivable with No Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans486 486 618
Consumer Excluding Credit Card
     
Financing Receivable, Impaired [Line Items]     
Retained loans310,104 310,104 327,464
Consumer Excluding Credit Card | Impaired Financing Receivable with Related Allowance [Domain] | Consumer Loans Auto Financing Receivable [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans86 86 102
Consumer Excluding Credit Card | Impaired Financing Receivable with Related Allowance [Domain] | Consumer business banking
     
Financing Receivable, Impaired [Line Items]     
Impaired loans745 745 774
Consumer Excluding Credit Card | Impaired Financing Receivable with No Related Allowance [Domain] | Consumer Loans Auto Financing Receivable [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans1 1 0
Consumer Excluding Credit Card | Impaired Financing Receivable with No Related Allowance [Domain] | Consumer business banking
     
Financing Receivable, Impaired [Line Items]     
Impaired loans0 0 0
Consumer Excluding Credit Card | Consumer Loans Auto Financing Receivable [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans87 87 102
Allowance for loan losses related to impaired loans12 12 16
Unpaid principal balance of impaired loans122 122 132
Financing Receivable, Recorded Investment, Nonaccrual Status38 38 50
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)8811793125 
Consumer Excluding Credit Card | Consumer business banking
     
Financing Receivable, Impaired [Line Items]     
Impaired loans745 745 774
Allowance for loan losses related to impaired loans205 205 248
Unpaid principal balance of impaired loans858 858 899
Financing Receivable, Recorded Investment, Nonaccrual Status589 589 647
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)751786762647 
Consumer Excluding Credit Card | Other Consumer [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans832 832 876
Allowance for loan losses related to impaired loans217 217 264
Unpaid principal balance of impaired loans980 980 1,031
Financing Receivable, Recorded Investment, Nonaccrual Status627 627 697
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)839903855772 
Consumer Excluding Credit Card | Other Consumer [Member] | Impaired Financing Receivable with Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans831 831 876
Consumer Excluding Credit Card | Other Consumer [Member] | Impaired Financing Receivable with No Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans1 1 0
Consumer Loan Excluding Credit Card
     
Financing Receivable, Impaired [Line Items]     
Retained loans310,104 310,104 327,464
Residential real estate, excluding PCI [Member]
     
Financing Receivable, Impaired [Line Items]     
Retained loans164,553 164,553 174,211
Impaired loans8,264 8,264 5,344
Allowance for loan losses related to impaired loans799 799 811
Unpaid principal balance of impaired loans11,102 11,102 7,195
Impaired Loans On Nonaccrual Status1,739 1,739 1,267
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)7,8564,9066,8024,284 
Impaired Financing Receivable, Interest Income, Accrual Method8856231154 
Impaired Financing Receivable, Interest Income, Cash Basis Method10102427 
Residential real estate, excluding PCI [Member] | Impaired Financing Receivable with Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans7,479 7,479 4,557
Residential real estate, excluding PCI [Member] | Impaired Financing Receivable with No Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans785 785 787
Impaired Financing Receivable with Related Allowance [Domain] | Home Equity Senior Lien [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans258 258 211
Impaired Financing Receivable with No Related Allowance [Domain] | Home Equity Senior Lien [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans17 17 15
Home Equity Senior Lien [Member]
     
Financing Receivable, Impaired [Line Items]     
Retained loans22,364 22,364 24,376
Impaired loans275 275 226
Allowance for loan losses related to impaired loans93 93 77
Unpaid principal balance of impaired loans343 343 265
Impaired Loans On Nonaccrual Status48 48 38
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)268219248202 
Impaired Financing Receivable, Interest Income, Accrual Method35810 
Impaired Financing Receivable, Interest Income, Cash Basis Method0011 
Home Equity Junior Lien [Member]
     
Financing Receivable, Impaired [Line Items]     
Retained loans57,914 57,914 64,009
Impaired loans606 606 283
Allowance for loan losses related to impaired loans177 177 82
Unpaid principal balance of impaired loans871 871 402
Impaired Loans On Nonaccrual Status201 201 63
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)568261464262 
Impaired Financing Receivable, Interest Income, Accrual Method41129 
Impaired Financing Receivable, Interest Income, Cash Basis Method1021 
Home Equity Junior Lien [Member] | Impaired Financing Receivable with Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans574 574 258
Home Equity Junior Lien [Member] | Impaired Financing Receivable with No Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans32 32 25
Impaired Financing Receivable with Related Allowance [Domain] | Prime Mortgages, including option ARMs [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans3,814 3,814 1,525
Impaired Financing Receivable with No Related Allowance [Domain] | Prime Mortgages, including option ARMs [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans562 562 559
Prime Mortgages, including option ARMs [Member]
     
Financing Receivable, Impaired [Line Items]     
Retained loans74,230 74,230 74,539
Impaired loans4,376 4,376 2,084
Allowance for loan losses related to impaired loans77 77 97
Unpaid principal balance of impaired loans5,479 5,479 2,751
Impaired Loans On Nonaccrual Status738 738 534
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)4,0891,7413,2671,363 
Impaired Financing Receivable, Interest Income, Accrual Method421910148 
Impaired Financing Receivable, Interest Income, Cash Basis Method451010 
Impaired Financing Receivable with Related Allowance [Domain] | Subprime Mortgage [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans2,833 2,833 2,563
Impaired Financing Receivable with No Related Allowance [Domain] | Subprime Mortgage [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans174 174 188
Subprime Mortgage [Member]
     
Financing Receivable, Impaired [Line Items]     
Retained loans10,045 10,045 11,287
Impaired loans3,007 3,007 2,751
Allowance for loan losses related to impaired loans452 452 555
Unpaid principal balance of impaired loans4,409 4,409 3,777
Impaired Loans On Nonaccrual Status752 752 632
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)2,9312,6852,8232,457 
Impaired Financing Receivable, Interest Income, Accrual Method393111087 
Impaired Financing Receivable, Interest Income, Cash Basis Method551115 
Other Consumer [Member]
     
Financing Receivable, Impaired [Line Items]     
Retained loans78,423 78,423 80,490
Consumer Loans Auto Financing Receivable [Member]
     
Financing Receivable, Impaired [Line Items]     
Retained loans46,659 46,659 48,367
Consumer business banking
     
Financing Receivable, Impaired [Line Items]     
Retained loans$ 17,272 $ 17,272 $ 16,812