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Loans - Impaired Loans (Details 3) (USD $)
In Millions
3 Months Ended6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Financing Receivable, Impaired [Line Items]     
Loans receivable held for investment, Net of Deferred Income$ 684,916$ 695,210$ 684,916$ 695,210$ 685,498
Impaired loans7,011 7,011 5,344
Allowance for loan losses related to impaired loans820 820 811
Unpaid principal balance of impaired loans9,422 9,422 7,195
Impaired Loans On Nonaccrual Status1,678 1,678 1,267
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)6,7174,3166,2663,966 
Impaired Financing Receivable, Interest Income, Accrual Method764914398 
Impaired Financing Receivable, Interest Income, Cash Basis Method8121417 
Wholesale
     
Financing Receivable, Impaired [Line Items]     
Loans receivable held for investment, Net of Deferred Income244,224 244,224 222,510
Impaired loans3,380 3,380 5,486
Allowance for loan losses related to impaired loans749 749 1,574
Unpaid principal balance of impaired loans4,914 4,914 7,260
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)4,2526,1194,6456,288 
Wholesale | Commercial and industrial [Member]
     
Financing Receivable, Impaired [Line Items]     
Loans receivable held for investment, Net of Deferred Income73,553 73,553 66,576
Impaired loans1,262 1,262 1,669
Allowance for loan losses related to impaired loans331 331 435
Unpaid principal balance of impaired loans1,979 1,979 2,453
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)1,4261,5741,4861,739 
Wholesale | Commercial and industrial [Member] | Impaired Financing Receivable with Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans1,143 1,143 1,512
Wholesale | Commercial and industrial [Member] | Impaired Financing Receivable with No Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans119 119 157
Wholesale | Real Estate [Member]
     
Financing Receivable, Impaired [Line Items]     
Loans receivable held for investment, Net of Deferred Income52,392 52,392 53,635
Impaired loans1,400 1,400 2,955
Allowance for loan losses related to impaired loans251 251 825
Unpaid principal balance of impaired loans1,384 1,384 3,487
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)2,1013,3992,4213,220 
Wholesale | Real Estate [Member] | Impaired Financing Receivable with Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans1,077 1,077 2,510
Wholesale | Real Estate [Member] | Impaired Financing Receivable with No Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans323 323 445
Wholesale | Financial institutions [Member]
     
Financing Receivable, Impaired [Line Items]     
Loans receivable held for investment, Net of Deferred Income36,428 36,428 31,458
Impaired loans65 65 135
Allowance for loan losses related to impaired loans14 14 61
Unpaid principal balance of impaired loans132 132 244
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)6727081391 
Wholesale | Financial institutions [Member] | Impaired Financing Receivable with Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans44 44 127
Wholesale | Financial institutions [Member] | Impaired Financing Receivable with No Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans21 21 8
Wholesale | Government agencies [Member]
     
Financing Receivable, Impaired [Line Items]     
Loans receivable held for investment, Net of Deferred Income7,184 7,184 7,278
Impaired loans23 23 22
Allowance for loan losses related to impaired loans14 14 14
Unpaid principal balance of impaired loans23 23 30
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)234224 
Wholesale | Government agencies [Member] | Impaired Financing Receivable with Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans23 23 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]     
Loans receivable held for investment, Net of Deferred Income74,667 74,667 63,563
Impaired loans630 630 705
Allowance for loan losses related to impaired loans139 139 239
Unpaid principal balance of impaired loans1,396 1,396 1,046
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)635872635934 
Wholesale | Wholesale Other Member | Impaired Financing Receivable with Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans565 565 697
Wholesale | Wholesale Other Member | Impaired Financing Receivable with No Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans65 65 8
Wholesale | Impaired Financing Receivable with Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans2,852 2,852 4,868
Wholesale | Impaired Financing Receivable with No Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans528 528 618
Consumer Excluding Credit Card
     
Financing Receivable, Impaired [Line Items]     
Loans receivable held for investment, Net of Deferred Income315,169 315,169 327,464
Consumer Excluding Credit Card | Other Consumer [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans847 847 876
Allowance for loan losses related to impaired loans229 229 264
Unpaid principal balance of impaired loans994 994 1,031
Financing Receivable, Recorded Investment, Nonaccrual Status637 637 697
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)856776863706 
Consumer Excluding Credit Card | Other Consumer [Member] | Impaired Financing Receivable with Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans846 846 876
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 Excluding Credit Card | Impaired Financing Receivable with Related Allowance [Domain] | Consumer Loans Auto Financing Receivable [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans88 88 102
Consumer Excluding Credit Card | Impaired Financing Receivable with Related Allowance [Domain] | Consumer business banking [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans758 758 774
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 [Member]
     
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 loans89 89 102
Allowance for loan losses related to impaired loans12 12 16
Unpaid principal balance of impaired loans122 122 132
Financing Receivable, Recorded Investment, Nonaccrual Status39 39 50
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)9213095128 
Consumer Excluding Credit Card | Consumer business banking [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans758 758 774
Allowance for loan losses related to impaired loans217 217 248
Unpaid principal balance of impaired loans872 872 899
Financing Receivable, Recorded Investment, Nonaccrual Status598 598 647
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)764646768578 
Consumer Loan Excluding Credit Card
     
Financing Receivable, Impaired [Line Items]     
Loans receivable held for investment, Net of Deferred Income315,169 315,169 327,464
Residential real estate, excluding PCI [Member]
     
Financing Receivable, Impaired [Line Items]     
Loans receivable held for investment, Net of Deferred Income167,468 167,468 174,211
Impaired Financing Receivable with Related Allowance [Domain] | Home Equity Senior Lien [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans244 244 211
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]     
Loans receivable held for investment, Net of Deferred Income22,969 22,969 24,376
Impaired loans261 261 226
Allowance for loan losses related to impaired loans82 82 77
Unpaid principal balance of impaired loans320 320 265
Impaired Loans On Nonaccrual Status53 53 38
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)245221238193 
Impaired Financing Receivable, Interest Income, Accrual Method2355 
Impaired Financing Receivable, Interest Income, Cash Basis Method1111 
Impaired Financing Receivable with Related Allowance [Domain] | Home Equity Junior Lien [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans489 489 258
Impaired Financing Receivable with No Related Allowance [Domain] | Home Equity Junior Lien [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans28 28 25
Home Equity Junior Lien [Member]
     
Financing Receivable, Impaired [Line Items]     
Loans receivable held for investment, Net of Deferred Income59,782 59,782 64,009
Impaired loans517 517 283
Allowance for loan losses related to impaired loans148 148 82
Unpaid principal balance of impaired loans715 715 402
Impaired Loans On Nonaccrual Status232 232 63
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)469255411262 
Impaired Financing Receivable, Interest Income, Accrual Method4588 
Impaired Financing Receivable, Interest Income, Cash Basis Method1111 
Impaired Financing Receivable with Related Allowance [Domain] | Prime Mortgages, including option ARMs [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans2,812 2,812 1,525
Impaired Financing Receivable with No Related Allowance [Domain] | Prime Mortgages, including option ARMs [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans578 578 559
Prime Mortgages, including option ARMs [Member]
     
Financing Receivable, Impaired [Line Items]     
Loans receivable held for investment, Net of Deferred Income74,276 74,276 74,539
Impaired loans3,390 3,390 2,084
Allowance for loan losses related to impaired loans78 78 97
Unpaid principal balance of impaired loans4,308 4,308 2,751
Impaired Loans On Nonaccrual Status698 698 534
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)3,2161,3652,8481,171 
Impaired Financing Receivable, Interest Income, Accrual Method33125929 
Impaired Financing Receivable, Interest Income, Cash Basis Method3465 
Impaired Financing Receivable with Related Allowance [Domain] | Subprime Mortgage [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans2,666 2,666 2,563
Impaired Financing Receivable with No Related Allowance [Domain] | Subprime Mortgage [Member]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans177 177 188
Subprime Mortgage [Member]
     
Financing Receivable, Impaired [Line Items]     
Loans receivable held for investment, Net of Deferred Income10,441 10,441 11,287
Impaired loans2,843 2,843 2,751
Allowance for loan losses related to impaired loans512 512 555
Unpaid principal balance of impaired loans4,079 4,079 3,777
Impaired Loans On Nonaccrual Status695 695 632
Average Impaired Loans And Related Interest Income Abstract     
Impaired loans (average)2,7872,4752,7692,340 
Impaired Financing Receivable, Interest Income, Accrual Method37297156 
Impaired Financing Receivable, Interest Income, Cash Basis Method36610 
Other Consumer [Member]
     
Financing Receivable, Impaired [Line Items]     
Loans receivable held for investment, Net of Deferred Income78,707 78,707 80,490
Consumer Loans Auto Financing Receivable [Member]
     
Financing Receivable, Impaired [Line Items]     
Loans receivable held for investment, Net of Deferred Income46,796 46,796 48,367
Consumer business banking [Member]
     
Financing Receivable, Impaired [Line Items]     
Loans receivable held for investment, Net of Deferred Income17,141 17,141 16,812
Impaired Financing Receivable with Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans6,211 6,211 4,557
Impaired Financing Receivable with No Related Allowance [Domain]
     
Financing Receivable, Impaired [Line Items]     
Impaired loans$ 800 $ 800 $ 787