Fair Value Measurement - Level 3 (Details 4) (USD $)		3 Months Ended			3 Months Ended																																																3 Months Ended				3 Months Ended				3 Months Ended				3 Months Ended				3 Months Ended				3 Months Ended				3 Months Ended				3 Months Ended				3 Months Ended				0 Months Ended																										0 Months Ended
	Mar. 31, 2012	Mar. 31, 2012 Level 3 [Member]	Mar. 31, 2012 Debt and Equity Instruments [Member] Level 3 [Member]	Dec. 31, 2011 Reverse Mortgage [Member]	Mar. 31, 2012 Derivative Receivables Net Of Payables [ Member] Level 3 [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Credit Derivatives with Underlying Mortgage Risk [Member] Level 3 [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Debt and Equity Instruments [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Debt and Equity Instruments [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Debt and Equity Instruments [Member] Level 3 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Debt and Equity Instruments [Member] Level 3 [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Derivative receivables [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Derivative receivables [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Derivative receivables [Member] Level 3 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Derivative receivables [Member] Level 3 [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Credit derivatives	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Credit derivatives	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Credit derivatives Level 3 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Credit derivatives Level 3 [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Interest rate contract	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Interest rate contract	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Interest rate contract Level 3 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Interest rate contract Level 3 [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Foreign exchange contract	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Foreign exchange contract	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Foreign exchange contract Level 3 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Foreign exchange contract Level 3 [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Equity Contract	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Equity Contract	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Equity Contract Level 3 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Equity Contract Level 3 [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Collateralized loan obligations	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Collateralized loan obligations	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Collateralized loan obligations Level 3 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Collateralized loan obligations Level 3 [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Reverse Mortgage [Member] Level 3 [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Loans	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Loans	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Loans Level 3 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Loans Level 3 [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Commodity Contract	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Commodity Contract	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Commodity Contract Level 3 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Commodity Contract Level 3 [Member]	Mar. 31, 2012 Long-term debt, other borrowed funds, and deposits [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2012 Residential Mortgage Backed Securities And Loans [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2012 Commercial Mortgage Backed Securites And Loans [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2012 Collateralized loan obligations Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2012 Corporate debt securities, obligations of U.S. states and municipalities, and other [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2012 Derivative Receivables Net Of Payables [ Member]	Mar. 31, 2011 Derivative Receivables Net Of Payables [ Member]	Dec. 31, 2011 Derivative Receivables Net Of Payables [ Member]	Mar. 31, 2010 Derivative Receivables Net Of Payables [ Member]	Mar. 31, 2012 Debt and Equity Instruments [Member]	Mar. 31, 2011 Debt and Equity Instruments [Member]	Dec. 31, 2011 Debt and Equity Instruments [Member]	Mar. 31, 2010 Debt and Equity Instruments [Member]	Mar. 31, 2012 Servicing Contracts [Member]	Mar. 31, 2011 Servicing Contracts [Member]	Dec. 31, 2011 Servicing Contracts [Member]	Mar. 31, 2010 Servicing Contracts [Member]	Mar. 31, 2012 Private Equity Funds [Member]	Mar. 31, 2011 Private Equity Funds [Member]	Dec. 31, 2011 Private Equity Funds [Member]	Mar. 31, 2010 Private Equity Funds [Member]	Mar. 31, 2012 Interest rate contract	Mar. 31, 2011 Interest rate contract	Dec. 31, 2011 Interest rate contract	Mar. 31, 2010 Interest rate contract	Mar. 31, 2012 Credit derivatives	Mar. 31, 2011 Credit derivatives	Dec. 31, 2011 Credit derivatives	Mar. 31, 2010 Credit derivatives	Mar. 31, 2012 Commodity Contract	Mar. 31, 2011 Commodity Contract	Dec. 31, 2011 Commodity Contract	Mar. 31, 2010 Commodity Contract	Mar. 31, 2012 Foreign exchange contract	Mar. 31, 2011 Foreign exchange contract	Dec. 31, 2011 Foreign exchange contract	Mar. 31, 2010 Foreign exchange contract	Mar. 31, 2012 Equity Contract	Mar. 31, 2011 Equity Contract	Dec. 31, 2011 Equity Contract	Mar. 31, 2010 Equity Contract	Mar. 31, 2012 Discounted Cash Flows Valuation Technique [Member] Collateralized loan obligations	Mar. 31, 2012 Minimum [Member] Discounted Cash Flows Valuation Technique [Member] Long-term debt, other borrowed funds, and deposits [Member]	Mar. 31, 2012 Minimum [Member] Discounted Cash Flows Valuation Technique [Member] Residential Mortgage Backed Securities And Loans [Member]	Mar. 31, 2012 Minimum [Member] Discounted Cash Flows Valuation Technique [Member] Commercial Mortgage Backed Securites And Loans [Member]	Mar. 31, 2012 Minimum [Member] Discounted Cash Flows Valuation Technique [Member] Collateralized loan obligations	Mar. 31, 2012 Minimum [Member] Discounted Cash Flows Valuation Technique [Member] Corporate debt securities, obligations of U.S. states and municipalities, and other [Member]	Mar. 31, 2012 Minimum [Member] Discounted Cash Flows Valuation Technique [Member] Credit derivatives	Mar. 31, 2012 Minimum [Member] Consensus Pricing Valuation Technique [Member] Corporate debt securities, obligations of U.S. states and municipalities, and other [Member]	Mar. 31, 2012 Minimum [Member] Option Pricing Valuation Technique [Member] Long-term debt, other borrowed funds, and deposits [Member]	Mar. 31, 2012 Minimum [Member] Option Pricing Valuation Technique [Member] Interest rate contract	Mar. 31, 2012 Minimum [Member] Option Pricing Valuation Technique [Member] Commodity Contract	Mar. 31, 2012 Minimum [Member] Option Pricing Valuation Technique [Member] Foreign exchange contract	Mar. 31, 2012 Minimum [Member] Option Pricing Valuation Technique [Member] Equity Contract	Mar. 31, 2012 Maximum [Member] Discounted Cash Flows Valuation Technique [Member] Long-term debt, other borrowed funds, and deposits [Member]	Mar. 31, 2012 Maximum [Member] Discounted Cash Flows Valuation Technique [Member] Residential Mortgage Backed Securities And Loans [Member]	Mar. 31, 2012 Maximum [Member] Discounted Cash Flows Valuation Technique [Member] Commercial Mortgage Backed Securites And Loans [Member]	Mar. 31, 2012 Maximum [Member] Discounted Cash Flows Valuation Technique [Member] Collateralized loan obligations	Mar. 31, 2012 Maximum [Member] Discounted Cash Flows Valuation Technique [Member] Corporate debt securities, obligations of U.S. states and municipalities, and other [Member]	Mar. 31, 2012 Maximum [Member] Discounted Cash Flows Valuation Technique [Member] Credit derivatives	Mar. 31, 2012 Maximum [Member] Consensus Pricing Valuation Technique [Member] Corporate debt securities, obligations of U.S. states and municipalities, and other [Member]	Mar. 31, 2012 Maximum [Member] Option Pricing Valuation Technique [Member] Long-term debt, other borrowed funds, and deposits [Member]	Mar. 31, 2012 Maximum [Member] Option Pricing Valuation Technique [Member] Interest rate contract	Mar. 31, 2012 Maximum [Member] Option Pricing Valuation Technique [Member] Commodity Contract	Mar. 31, 2012 Maximum [Member] Option Pricing Valuation Technique [Member] Foreign exchange contract	Mar. 31, 2012 Maximum [Member] Option Pricing Valuation Technique [Member] Equity Contract	Mar. 31, 2012 Private Equity Direct Investments [Member] Private Equity Funds [Member]	Mar. 31, 2012 Private Equity Direct Investments [Member] Minimum [Member] Market Comparables Valuation Technique [Member] Private Equity Funds [Member]	Mar. 31, 2012 Private Equity Direct Investments [Member] Maximum [Member] Market Comparables Valuation Technique [Member] Private Equity Funds [Member]	Mar. 31, 2012 Private Equity Fund Investments [Member] Private Equity Funds [Member]
Level 3 inputs
Fair value of assets																																																	$ 9,488,000,000	$ 2,166,000,000	$ 31,000,000,000	$ 19,725,000,000
Fair value of assets																																																					3,557,000,000	3,137,000,000	6,238,000,000	4,357,000,000	30,339,000,000	34,248,000,000	32,967,000,000	34,554,000,000	8,039,000,000	13,093,000,000	7,223,000,000	13,649,000,000	6,739,000,000	8,853,000,000	6,751,000,000	7,862,000,000	3,238,000,000	2,470,000,000	3,561,000,000	2,836,000,000	4,808,000,000	4,373,000,000	7,732,000,000	5,386,000,000	(600,000,000)	(865,000,000)	(687,000,000)	(805,000,000)	(1,060,000,000)	2,000,000	(1,263,000,000)	(614,000,000)	(2,829,000,000)	(2,843,000,000)	(3,105,000,000)	(2,446,000,000)																										4,812,000,000			1,927,000,000
Liabilities, Fair Value Disclosure						211,478,000,000	201,742,000,000	39,570,000,000	43,091,000,000																																							12,437,000,000
Discount rate																																																																																											5.00%	5.00%		1.00%									25.00%	45.00%		35.00%
Constant prepayment rate																																																																																											0.00%	0.00%	10.00%										40.00%	10.00%	20.00%
Constant default rate																																																																																											0.00%	0.00%											70.00%	100.00%
Loss severity																																																																																											0.00%	0.00%											90.00%	40.00%
Credit spread																																																																																														1.30%												2.25%
Price																																																																																																25												115
Interest rate correlation																																																																																																	(75.00%)	(75.00%)											100.00%	100.00%
Interest rate spread volatility																																																																																																		0.00%												60.00%
Credit correlation																																																																																										15.00%					15.00%							75.00%					75.00%
Foreign exchange correlation																																																																																																	(55.00%)			(55.00%)									45.00%			45.00%
Equity volatility																																																																																																					20.00%												60.00%
Commodity volatility																																																																																																			30.00%												50.00%
Default correlation																																																																																													70.00%												98.50%
Recovery lag																																																																																									18 months
Liquidity spread																																																																																													1.50%												2.50%
Recovery rate																																																																																													0.00%												55.00%
Default rate																																																																																													0.00%												75.00%
EBITDA multiple																																																																																																																			3.2	10.8
Liquidity adjustment																																																																																																																			0.00%	40.00%
Equity correlation																																																																																																	(50.00%)												75.00%
Level 3 Analysis - Supplemental Data
Available-for-sale securities								25,917,000,000	25,486,000,000																										25,239,000,000	24,861,000,000	25,239,000,000	24,745,000,000
Trading assets				4,000,000,000		455,633,000,000	443,963,000,000	59,869,000,000	68,008,000,000	2,300,000,000	370,623,000,000	351,486,000,000	30,339,000,000	32,967,000,000	85,010,000,000	92,477,000,000	29,530,000,000	35,041,000,000	6,258,000,000	6,684,000,000	11,796,000,000	17,081,000,000	41,520,000,000	46,369,000,000	6,129,000,000	6,728,000,000	13,056,000,000	17,890,000,000	4,039,000,000	4,641,000,000	8,995,000,000	6,793,000,000	5,054,000,000	4,132,000,000			5,800,000,000		3,900,000,000	32,505,000,000	33,798,000,000	11,144,000,000	12,209,000,000	15,181,000,000	14,741,000,000	2,512,000,000	2,459,000,000
Trading liabilities						146,296,000,000	141,695,000,000	26,246,000,000	29,014,000,000	1,600,000,000	71,529,000,000	66,718,000,000	273,000,000	211,000,000	74,767,000,000	74,977,000,000	25,973,000,000	28,803,000,000	6,996,000,000	5,610,000,000	6,988,000,000	9,349,000,000	24,235,000,000	28,010,000,000	2,891,000,000	3,167,000,000	15,534,000,000	17,435,000,000	5,099,000,000	5,904,000,000	12,909,000,000	9,655,000,000	7,883,000,000	7,237,000,000										15,093,000,000	14,267,000,000	3,112,000,000	3,146,000,000
Percentage of level 3 assets in total Firm assets	4.70%
Increase (decrease) in level 3 assets		(9,200,000,000)	(2,600,000,000)		(5,500,000,000)
Gains (losses) on level 3 assets																																																					$ (1,613,000,000)	$ 501,000,000			$ 734,000,000	$ 761,000,000			$ 596,000,000	$ (751,000,000)			$ 252,000,000	$ 905,000,000			$ 1,328,000,000	$ 519,000,000			$ (2,354,000,000)	$ (853,000,000)			$ 6,000,000	$ 595,000,000			$ 127,000,000	$ 61,000,000			$ (720,000,000)	$ 179,000,000