Fair Value Measurement - Level 3 Inputs (Details 1) (USD $)																																																	0 Months Ended						0 Months Ended																																				0 Months Ended
	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member]	Dec. 31, 2012 Fair Value, Measurements, Nonrecurring [Member]	Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member]	Dec. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member]	Mar. 31, 2013 Residential Mortgage [Member] Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member]	Mar. 31, 2013 Residential Mortgage Backed Securities And Loans [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2013 Commercial Mortgage Backed Securites And Loans [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2013 Derivative Receivables Net Of Payables [ Member]	Dec. 31, 2012 Derivative Receivables Net Of Payables [ Member]	Mar. 31, 2012 Derivative Receivables Net Of Payables [ Member]	Dec. 31, 2011 Derivative Receivables Net Of Payables [ Member]	Mar. 31, 2013 Debt and Equity Instruments [Member]	Dec. 31, 2012 Debt and Equity Instruments [Member]	Mar. 31, 2012 Debt and Equity Instruments [Member]	Dec. 31, 2011 Debt and Equity Instruments [Member]	Mar. 31, 2013 Servicing Contracts [Member]	Dec. 31, 2012 Servicing Contracts [Member]	Mar. 31, 2012 Servicing Contracts [Member]	Dec. 31, 2011 Servicing Contracts [Member]	Mar. 31, 2013 Private Equity Funds [Member]	Dec. 31, 2012 Private Equity Funds [Member]	Mar. 31, 2012 Private Equity Funds [Member]	Dec. 31, 2011 Private Equity Funds [Member]	Mar. 31, 2013 Interest rate contract	Dec. 31, 2012 Interest rate contract	Mar. 31, 2012 Interest rate contract	Dec. 31, 2011 Interest rate contract	Mar. 31, 2013 Credit derivatives	Dec. 31, 2012 Credit derivatives	Mar. 31, 2012 Credit derivatives	Dec. 31, 2011 Credit derivatives	Mar. 31, 2013 Commodity Contract	Dec. 31, 2012 Commodity Contract	Mar. 31, 2012 Commodity Contract	Dec. 31, 2011 Commodity Contract	Mar. 31, 2013 Foreign exchange contract	Dec. 31, 2012 Foreign exchange contract	Mar. 31, 2012 Foreign exchange contract	Dec. 31, 2011 Foreign exchange contract	Mar. 31, 2013 Equity Contract	Dec. 31, 2012 Equity Contract	Mar. 31, 2012 Equity Contract	Dec. 31, 2011 Equity Contract	Mar. 31, 2013 Discounted Cash Flows Valuation Technique [Member] Long-term debt, other borrowed funds, and deposits [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2013 Discounted Cash Flows Valuation Technique [Member] Collateralized loan obligations	Mar. 31, 2013 Discounted Cash Flows Valuation Technique [Member] Collateralized loan obligations Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2013 Discounted Cash Flows Valuation Technique [Member] Corporate debt securities, obligations of U.S. states and municipalities, and other [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2013 Market Comparables Valuation Technique [Member] Collateralized loan obligations Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2013 Market Comparables Valuation Technique [Member] Corporate debt securities, obligations of U.S. states and municipalities, and other [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2013 Option Pricing Valuation Technique [Member] Long-term debt, other borrowed funds, and deposits [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Dec. 31, 2012 Minimum Broker Price Opinion Valuation Technique [Member] Residential Mortgage [Member]	Mar. 31, 2013 Minimum Discounted Cash Flows Valuation Technique [Member] Long-term debt, other borrowed funds, and deposits [Member]	Mar. 31, 2013 Minimum Discounted Cash Flows Valuation Technique [Member] Residential Mortgage Backed Securities And Loans [Member]	Mar. 31, 2013 Minimum Discounted Cash Flows Valuation Technique [Member] Commercial Mortgage Backed Securites And Loans [Member]	Mar. 31, 2013 Minimum Discounted Cash Flows Valuation Technique [Member] Collateralized loan obligations	Mar. 31, 2013 Minimum Discounted Cash Flows Valuation Technique [Member] Credit derivatives	Mar. 31, 2013 Minimum Discounted Cash Flows Valuation Technique [Member] Corporate debt securities, obligations of U.S. states and municipalities, and other [Member]	Mar. 31, 2013 Minimum Market Comparables Valuation Technique [Member] Collateralized loan obligations	Mar. 31, 2013 Minimum Market Comparables Valuation Technique [Member] Corporate debt securities, obligations of U.S. states and municipalities, and other [Member]	Mar. 31, 2013 Minimum Option Pricing Valuation Technique [Member] Long-term debt, other borrowed funds, and deposits [Member]	Mar. 31, 2013 Minimum Option Pricing Valuation Technique [Member] Interest rate contract	Mar. 31, 2013 Minimum Option Pricing Valuation Technique [Member] Commodity Contract	Mar. 31, 2013 Minimum Option Pricing Valuation Technique [Member] Foreign exchange contract	Mar. 31, 2013 Minimum Option Pricing Valuation Technique [Member] Equity Contract	Dec. 31, 2012 Maximum Broker Price Opinion Valuation Technique [Member] Residential Mortgage [Member]	Mar. 31, 2013 Maximum Discounted Cash Flows Valuation Technique [Member] Long-term debt, other borrowed funds, and deposits [Member]	Mar. 31, 2013 Maximum Discounted Cash Flows Valuation Technique [Member] Residential Mortgage Backed Securities And Loans [Member]	Mar. 31, 2013 Maximum Discounted Cash Flows Valuation Technique [Member] Commercial Mortgage Backed Securites And Loans [Member]	Mar. 31, 2013 Maximum Discounted Cash Flows Valuation Technique [Member] Collateralized loan obligations	Mar. 31, 2013 Maximum Discounted Cash Flows Valuation Technique [Member] Credit derivatives	Mar. 31, 2013 Maximum Discounted Cash Flows Valuation Technique [Member] Corporate debt securities, obligations of U.S. states and municipalities, and other [Member]	Mar. 31, 2013 Maximum Market Comparables Valuation Technique [Member] Collateralized loan obligations	Mar. 31, 2013 Maximum Market Comparables Valuation Technique [Member] Corporate debt securities, obligations of U.S. states and municipalities, and other [Member]	Mar. 31, 2013 Maximum Option Pricing Valuation Technique [Member] Long-term debt, other borrowed funds, and deposits [Member]	Mar. 31, 2013 Maximum Option Pricing Valuation Technique [Member] Interest rate contract	Mar. 31, 2013 Maximum Option Pricing Valuation Technique [Member] Commodity Contract	Mar. 31, 2013 Maximum Option Pricing Valuation Technique [Member] Foreign exchange contract	Mar. 31, 2013 Maximum Option Pricing Valuation Technique [Member] Equity Contract	Dec. 31, 2012 Weighted Average [Member] Broker Price Opinion Valuation Technique [Member] Residential Mortgage [Member]	Mar. 31, 2013 Weighted Average [Member] Discounted Cash Flows Valuation Technique [Member] Residential Mortgage Backed Securities And Loans [Member]	Mar. 31, 2013 Weighted Average [Member] Discounted Cash Flows Valuation Technique [Member] Commercial Mortgage Backed Securites And Loans [Member]	Mar. 31, 2013 Weighted Average [Member] Discounted Cash Flows Valuation Technique [Member] Collateralized loan obligations	Mar. 31, 2013 Weighted Average [Member] Discounted Cash Flows Valuation Technique [Member] Corporate debt securities, obligations of U.S. states and municipalities, and other [Member]	Mar. 31, 2013 Weighted Average [Member] Market Comparables Valuation Technique [Member] Collateralized loan obligations	Mar. 31, 2013 Weighted Average [Member] Market Comparables Valuation Technique [Member] Corporate debt securities, obligations of U.S. states and municipalities, and other [Member]	Mar. 31, 2013 Private Equity Direct Investments [Member] Market Comparables Valuation Technique [Member] Private Equity Funds [Member]	Mar. 31, 2013 Private Equity Direct Investments [Member] Minimum Market Comparables Valuation Technique [Member] Private Equity Funds [Member]	Mar. 31, 2013 Private Equity Direct Investments [Member] Maximum Market Comparables Valuation Technique [Member] Private Equity Funds [Member]	Mar. 31, 2013 Private Equity Direct Investments [Member] Weighted Average [Member] Market Comparables Valuation Technique [Member] Private Equity Funds [Member]	Mar. 31, 2013 Private Equity Fund Investments [Member] Net Asset Value Valuation Technique [Member] Private Equity Funds [Member]	Mar. 31, 2013 Private Equity Fund Investments [Member] Net Asset Value Valuation Technique [Member] Private Equity Funds [Member]	Mar. 31, 2013 Credit Derivatives with Underlying Mortgage Risk [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2013 Debt and Equity Instruments [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2012 Debt and Equity Instruments [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2013 Debt and Equity Instruments [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Dec. 31, 2012 Debt and Equity Instruments [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2013 Derivative receivables [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2012 Derivative receivables [Member] Fair Value, Measurements, Recurring [Member]	Mar. 31, 2013 Derivative receivables [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Dec. 31, 2012 Derivative receivables [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2013 Credit derivatives Fair Value, Measurements, Recurring [Member]	Dec. 31, 2012 Credit derivatives Fair Value, Measurements, Recurring [Member]	Mar. 31, 2013 Credit derivatives Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Dec. 31, 2012 Credit derivatives Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2013 Interest rate contract Fair Value, Measurements, Recurring [Member]	Dec. 31, 2012 Interest rate contract Fair Value, Measurements, Recurring [Member]	Mar. 31, 2013 Interest rate contract Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Dec. 31, 2012 Interest rate contract Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2013 Foreign exchange contract Fair Value, Measurements, Recurring [Member]	Dec. 31, 2012 Foreign exchange contract Fair Value, Measurements, Recurring [Member]	Mar. 31, 2013 Foreign exchange contract Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Dec. 31, 2012 Foreign exchange contract Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2013 Equity Contract Fair Value, Measurements, Recurring [Member]	Dec. 31, 2012 Equity Contract Fair Value, Measurements, Recurring [Member]	Mar. 31, 2013 Equity Contract Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Dec. 31, 2012 Equity Contract Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2013 Collateralized loan obligations Fair Value, Measurements, Recurring [Member]	Dec. 31, 2012 Collateralized loan obligations Fair Value, Measurements, Recurring [Member]	Mar. 31, 2013 Collateralized loan obligations Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Dec. 31, 2012 Collateralized loan obligations Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2013 Reverse Mortgage [Member]	Dec. 31, 2012 Reverse Mortgage [Member]	Mar. 31, 2013 Loans Fair Value, Measurements, Recurring [Member]	Dec. 31, 2012 Loans Fair Value, Measurements, Recurring [Member]	Mar. 31, 2013 Loans Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Dec. 31, 2012 Loans Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Mar. 31, 2013 Commodity Contract Fair Value, Measurements, Recurring [Member]	Dec. 31, 2012 Commodity Contract Fair Value, Measurements, Recurring [Member]	Mar. 31, 2013 Commodity Contract Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Dec. 31, 2012 Commodity Contract Fair Value, Measurements, Recurring [Member] Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring					$ 1,000,000,000	$ 5,100,000,000	$ 800,000,000	$ 4,400,000,000	$ 733,000,000
Fair Value Inputs, Liquidation Value Discount																																																							18.00%														59.00%														29.00%
Level 3 Inputs
Fair value of assets										9,370,000,000	1,958,000,000																																							1,000,000,000	13,942,000,000	624,000,000	3,825,000,000
Fair value of assets												1,774,000,000	1,893,000,000	3,557,000,000	6,238,000,000	22,703,000,000	25,639,000,000	30,339,000,000	32,967,000,000	7,949,000,000	7,614,000,000	8,039,000,000	7,223,000,000	6,831,000,000	7,181,000,000	6,739,000,000	6,751,000,000	2,791,000,000	3,322,000,000	3,238,000,000	3,561,000,000	1,317,000,000	1,873,000,000	4,808,000,000	7,732,000,000	182,000,000	254,000,000	(600,000,000)	(687,000,000)	(1,516,000,000)	(1,750,000,000)	(1,060,000,000)	(1,263,000,000)	(1,000,000,000)	(1,806,000,000)	(2,829,000,000)	(3,105,000,000)																																											4,945,000,000				1,886,000,000	805,000,000
Liabilities, Fair Value Disclosure	181,771,000,000	185,624,000,000	34,421,000,000	34,609,000,000																																												1,111,000,000						12,125,000,000
Discount rate																																																									3.00%	2.00%			2.00%										15.00%	25.00%			31.00%									7.00%	6.00%		10.00%
Fair Value Inputs, Price																																																														0	20													125	135											0	93
Constant default rate																																																	2.00%								0.00%	0.00%													100.00%	8.00%												11.00%	0.00%	2.00%
Loss severity																																																	40.00%								0.00%	0.00%													82.00%	40.00%												11.00%	4.00%	40.00%
Credit spread																																																											1.60%		1.30%												5.50%		2.25%											2.05%	1.49%
Fair Value Inputs, Prepayment Rate																																																									0.00%		15.00%												42.00%		20.00%											7.00%		19.00%
Interest rate correlation																																																																(75.00%)	(75.00%)													94.00%	94.00%
Interest rate spread volatility																																																																	0.00%														60.00%
Credit correlation																																																								31.00%				31.00%										81.00%				90.00%
Foreign exchange correlation																																																																35.00%			35.00%											75.00%			75.00%
Equity volatility																																																																				5.00%														45.00%
Commodity volatility																																																																		17.00%														36.00%
EBITDA multiple																																																																																											2.9	14.0	8.4
Liquidity adjustment																																																																																											0.00%	30.00%	10.00%
Equity correlation																																																																(40.00%)														85.00%
Level 3 Inputs - Supplemental Data
Trading assets	430,991,000,000	450,028,000,000	44,560,000,000	48,897,000,000																																																																																												1,200,000,000	360,382,000,000	375,045,000,000	22,703,000,000	25,639,000,000	70,609,000,000	74,983,000,000	21,857,000,000	23,258,000,000	3,664,000,000	1,735,000,000	5,262,000,000	6,489,000,000	34,280,000,000	39,205,000,000	6,167,000,000	6,617,000,000	12,346,000,000	14,142,000,000	2,508,000,000	3,051,000,000	10,035,000,000	9,266,000,000	6,117,000,000	4,921,000,000					3,700,000,000	4,000,000,000	38,505,000,000	41,541,000,000	10,032,000,000	10,787,000,000	10,284,000,000	10,635,000,000	1,803,000,000	2,180,000,000
Trading liabilities	125,726,000,000	131,918,000,000	20,334,000,000	21,570,000,000																																																																																												1,100,000,000	63,737,000,000	61,262,000,000	251,000,000	205,000,000	61,989,000,000	70,656,000,000	20,083,000,000	21,365,000,000	3,134,000,000	2,504,000,000	3,945,000,000	4,616,000,000	18,611,000,000	24,906,000,000	3,376,000,000	3,295,000,000	14,806,000,000	18,601,000,000	4,024,000,000	4,801,000,000	13,347,000,000	11,819,000,000	7,117,000,000	6,727,000,000											12,091,000,000	12,826,000,000	1,621,000,000	1,926,000,000
Available-for-sale securities			$ 1,967,000,000	$ 28,916,000,000																																																																																																																					$ 27,359,000,000	$ 27,896,000,000	$ 1,000,000,000	$ 27,896,000,000