Loans - Wholesale RealEstate Loans, by Risk, Geography, Delinquency (Details 1) (USD $) In Millions, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010
Loan credit quality and risk ratings [Line Items]
Retained loans	$ 692,944	$ 685,498	$ 687,049
Wholesale
Loan credit quality and risk ratings [Line Items]
Retained loans	255,799	222,510
Percentage of total criticized to total retained loans	4.13%	6.42%
Percentage of nonaccrual loans to total retained loans	1.18%	2.48%
Wholesale | Commercial and industrial [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	82,224	66,576
Percentage of total criticized to total retained loans	4.14%	6.02%
Percentage of nonaccrual loans to total retained loans	1.30%	2.45%
Wholesale | Commercial and industrial [Member] | Total U.S.[Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	57,237	48,845
Wholesale | Commercial and industrial [Member] | Total non-U.S.[Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	24,987	17,731
Wholesale | Commercial and industrial [Member] | Current and less than 30 days past due and still accruing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	81,049	64,501
Wholesale | Commercial and industrial [Member] | 30-89 days past due and still accruing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	104	434
Wholesale | Commercial and industrial [Member] | 90 days or more past due and still accruing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	1	7
Wholesale | Commercial and industrial [Member] | Nonaccrual [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	1,070	1,634
Wholesale | Commercial and industrial [Member] | Investment grade [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	41,735	31,697
Wholesale | Commercial and industrial [Member] | Total noninvestment grade [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	40,489	34,879
Wholesale | Commercial and industrial [Member] | Non Criticized [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	37,087	30,874
Wholesale | Commercial and industrial [Member] | Criticized performing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	2,332	2,371
Wholesale | Commercial and industrial [Member] | Criticized total nonaccrual [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	1,070	1,634
Wholesale | Real estate [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	53,596	53,635
Percentage of total criticized to total retained loans	10.39%	16.23%
Percentage of nonaccrual loans to total retained loans	2.20%	5.48%
Wholesale | Real estate [Member] | Total U.S.[Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	51,926	51,672
Wholesale | Real estate [Member] | Total non-U.S.[Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	1,670	1,963
Wholesale | Real estate [Member] | Current and less than 30 days past due and still accruing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	52,222	50,299
Wholesale | Real estate [Member] | 30-89 days past due and still accruing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	123	290
Wholesale | Real estate [Member] | 90 days or more past due and still accruing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	72	109
Wholesale | Real estate [Member] | Nonaccrual [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	1,179	2,937
Wholesale | Real estate [Member] | Investment grade [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	31,236	28,504
Wholesale | Real estate [Member] | Total noninvestment grade [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	22,360	25,131
Wholesale | Real estate [Member] | Non Criticized [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	16,792	16,425
Wholesale | Real estate [Member] | Criticized performing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	4,389	5,769
Wholesale | Real estate [Member] | Criticized total nonaccrual [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	1,179	2,937
Wholesale | Financial institutions [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	35,505	31,458
Percentage of total criticized to total retained loans	0.73%	1.44%
Percentage of nonaccrual loans to total retained loans	0.16%	0.43%
Wholesale | Financial institutions [Member] | Total U.S.[Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	8,239	11,702
Wholesale | Financial institutions [Member] | Total non-U.S.[Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	27,266	19,756
Wholesale | Financial institutions [Member] | Current and less than 30 days past due and still accruing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	35,438	31,289
Wholesale | Financial institutions [Member] | 30-89 days past due and still accruing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	10	31
Wholesale | Financial institutions [Member] | 90 days or more past due and still accruing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	0	2
Wholesale | Financial institutions [Member] | Nonaccrual [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	57	136
Wholesale | Financial institutions [Member] | Investment grade [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	26,674	22,525
Wholesale | Financial institutions [Member] | Total noninvestment grade [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	8,831	8,933
Wholesale | Financial institutions [Member] | Non Criticized [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	8,571	8,480
Wholesale | Financial institutions [Member] | Criticized performing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	203	317
Wholesale | Financial institutions [Member] | Criticized total nonaccrual [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	57	136
Wholesale | Government agencies [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	7,551	7,278
Percentage of total criticized to total retained loans	0.28%	0.34%
Percentage of nonaccrual loans to total retained loans	0.23%	0.30%
Wholesale | Government agencies [Member] | Total U.S.[Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	6,648	6,408
Wholesale | Government agencies [Member] | Total non-U.S.[Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	903	870
Wholesale | Government agencies [Member] | Current and less than 30 days past due and still accruing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	7,532	7,222
Wholesale | Government agencies [Member] | 30-89 days past due and still accruing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	2	34
Wholesale | Government agencies [Member] | 90 days or more past due and still accruing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	0	0
Wholesale | Government agencies [Member] | Nonaccrual [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	17	22
Wholesale | Government agencies [Member] | Investment grade [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	7,245	6,871
Wholesale | Government agencies [Member] | Total noninvestment grade [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	306	407
Wholesale | Government agencies [Member] | Non Criticized [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	285	382
Wholesale | Government agencies [Member] | Criticized performing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	4	3
Wholesale | Government agencies [Member] | Criticized total nonaccrual [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	17	22
Wholesale | Other [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	76,923	63,563
Percentage of total criticized to total retained loans	1.71%	1.73%
Percentage of nonaccrual loans to total retained loans	0.89%	1.23%
Wholesale | Other [Member] | Total U.S.[Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	44,550	37,732
Wholesale | Other [Member] | Total non-U.S.[Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	32,373	25,831
Wholesale | Other [Member] | Current and less than 30 days past due and still accruing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	75,494	61,837
Wholesale | Other [Member] | 30-89 days past due and still accruing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	676	704
Wholesale | Other [Member] | 90 days or more past due and still accruing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	65	241
Wholesale | Other [Member] | Nonaccrual [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	688	781
Wholesale | Other [Member] | Investment grade [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	68,965	56,450
Wholesale | Other [Member] | Total noninvestment grade [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	7,958	7,113
Wholesale | Other [Member] | Non Criticized [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	6,643	6,012
Wholesale | Other [Member] | Criticized performing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	627	320
Wholesale | Other [Member] | Criticized total nonaccrual [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	688	781
Wholesale | Total U.S.[Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	168,600	156,359
Wholesale | Total non-U.S.[Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	87,199	66,151
Wholesale | Current and less than 30 days past due and still accruing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	251,735	215,148
Wholesale | 30-89 days past due and still accruing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	915	1,493
Wholesale | 90 days or more past due and still accruing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	138	359
Wholesale | Nonaccrual [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	3,011	5,510
Wholesale | Investment grade [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	175,855	146,047
Wholesale | Total noninvestment grade [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	79,944	76,463
Wholesale | Non Criticized [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	69,378	62,173
Wholesale | Criticized performing [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	7,555	8,780
Wholesale | Criticized total nonaccrual [Member]
Loan credit quality and risk ratings [Line Items]
Retained loans	$ 3,011	$ 5,510