Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $) In Millions, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets	$ 6,909		$ 7,861
Loans	8		10
Other assets	1,410	[1]	1,848	[1]
Total assets	103,822		99,533
Trading liabilities	6,940		8,071
Long-term debt	339	[2]	326	[2]
Other liabilities	455	[3]	382	[3]
Total liabilities	17,524		18,864
Available-for-sale
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	84,540		78,467
Available-for-sale | U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	14,470		17,326
Available-for-sale | U.S. Government Agencies
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,097		958
Available-for-sale | Sovereign Debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	9,029	[4]	11,954	[4]
Available-for-sale | State And Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	5,602	[2]	2,739	[2]
Available-for-sale | Agency RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	33,032		26,796
Available-for-sale | Alt-A RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	258	[4]	273	[4]
Available-for-sale | Prime RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	764	[4]	815	[4]
Available-for-sale | Subprime RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	422	[4]	418	[4]
Available-for-sale | Other RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,487		903
Available-for-sale | Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	3,320		3,339
Available-for-sale | Asset-Backed CLOs
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,080		1,444
Available-for-sale | Other Asset-Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,189		532
Available-for-sale | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	28		30
Available-for-sale | Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	918	[2]	973	[2]
Available-for-sale | Corporate Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,628		1,738
Available-for-sale | Other Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,251		2,625
Available-for-sale | Foreign Covered Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	3,928	[4]	2,425	[4]
Available-for-sale | Grantor Trust Alt-A RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,863	[4],[5]	1,879	[4],[5]
Available-for-sale | Grantor Trust Prime RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,059	[4],[5]	1,175	[4],[5]
Available-for-sale | Grantor Trust Sub Prime RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	115	[4],[5]	125	[4],[5]
Trading Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Debt and equity instruments	3,016	[6]	2,203	[6]
Derivative assets	3,893	[7]	5,658	[7]
Operations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets	92,867		88,186
Total liabilities	7,734		8,779
Investment Management Funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets	10,399		10,751
Other assets	556		596
Total assets	10,955		11,347
Trading liabilities	9,752		10,053
Other liabilities	38		32
Total liabilities	9,790		10,085
Trading Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Debt and equity instruments	1,060		955
Derivative liabilities	5,880	[7]	7,116	[7]
Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets	3,925		5,259
Other assets	187	[1]	672	[1]
Total assets	23,439		26,879
Percentage of assets prior to netting	18.00%		22.00%
Trading liabilities	3,631		4,784
Other liabilities			14	[3]
Total liabilities	3,631		4,800
Percentage of liabilities prior to netting	8.00%		11.00%
Level 1 | Available-for-sale
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	18,614		20,172
Level 1 | Available-for-sale | U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	14,470		17,326
Level 1 | Available-for-sale | Sovereign Debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	40		44
Level 1 | Available-for-sale | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	28		9
Level 1 | Available-for-sale | Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	918	[2]	973	[2]
Level 1 | Available-for-sale | Foreign Covered Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	3,158		1,820
Level 1 | Trading Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Debt and equity instruments	751	[6]	485	[6]
Derivative assets	3,174	[7]	4,774	[7]
Level 1 | Trading Assets | Interest Rate Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	37	[7]	164	[7]
Level 1 | Trading Assets | Foreign Exchange Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	3,014	[7]	4,519	[7]
Level 1 | Trading Assets | Equity Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	123	[7]	91	[7]
Level 1 | Operations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets	22,726		26,103
Percentage of assets prior to netting	19.00%		23.00%
Total liabilities	3,631		4,798
Percentage of liabilities prior to netting	11.00%		14.00%
Level 1 | Investment Management Funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets	320		323
Other assets	393		453
Total assets	713		776
Other liabilities			2
Total liabilities			2
Level 1 | Trading Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Debt and equity instruments	535		418
Derivative liabilities	3,096	[7]	4,366	[7]
Level 1 | Trading Liabilities | Foreign Exchange Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	3,010	[7]	4,311	[7]
Level 1 | Trading Liabilities | Equity Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	86	[7]	55	[7]
Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets	30,208		28,489
Loans	8		10
Other assets	1,085	[1]	1,019	[1]
Total assets	107,427		98,336
Percentage of assets prior to netting	82.00%		78.00%
Trading liabilities	29,323		27,982
Long-term debt	339	[2]	326	[2]
Other liabilities	455	[3]	368	[3]
Total liabilities	39,907		38,759
Percentage of liabilities prior to netting	91.00%		88.00%
Level 2 | Available-for-sale
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	65,884		58,247
Level 2 | Available-for-sale | U.S. Government Agencies
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,097		958
Level 2 | Available-for-sale | Sovereign Debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	8,989		11,910
Level 2 | Available-for-sale | State And Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	5,560	[2]	2,694	[2]
Level 2 | Available-for-sale | Agency RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	33,032		26,796
Level 2 | Available-for-sale | Alt-A RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	258		273
Level 2 | Available-for-sale | Prime RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	764		815
Level 2 | Available-for-sale | Subprime RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	422		418
Level 2 | Available-for-sale | Other RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,487		903
Level 2 | Available-for-sale | Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	3,320		3,339
Level 2 | Available-for-sale | Asset-Backed CLOs
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,080		1,444
Level 2 | Available-for-sale | Other Asset-Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,189		532
Level 2 | Available-for-sale | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale			21
Level 2 | Available-for-sale | Corporate Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,628		1,738
Level 2 | Available-for-sale | Other Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,251		2,622
Level 2 | Available-for-sale | Foreign Covered Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	770		605
Level 2 | Available-for-sale | Grantor Trust Alt-A RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,863	[5]	1,879	[5]
Level 2 | Available-for-sale | Grantor Trust Prime RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,059	[5]	1,175	[5]
Level 2 | Available-for-sale | Grantor Trust Sub Prime RMBS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	115	[5]	125	[5]
Level 2 | Trading Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Debt and equity instruments	2,205	[6]	1,655	[6]
Derivative assets	28,003	[7]	26,834	[7]
Level 2 | Trading Assets | Interest Rate Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	27,601	[7]	26,434	[7]
Level 2 | Trading Assets | Foreign Exchange Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	165	[7]	113	[7]
Level 2 | Trading Assets | Equity Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	237	[7]	284	[7]
Level 2 | Trading Assets | Other Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets			3	[7]
Level 2 | Operations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets	97,185		87,765
Percentage of assets prior to netting	81.00%		77.00%
Total liabilities	30,117		28,676
Percentage of liabilities prior to netting	88.00%		85.00%
Level 2 | Investment Management Funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets	10,079		10,428
Other assets	163		143
Total assets	10,242		10,571
Trading liabilities	9,752		10,053
Other liabilities	38		30
Total liabilities	9,790		10,083
Level 2 | Trading Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Debt and equity instruments	525		537
Derivative liabilities	28,798	[7]	27,445	[7]
Level 2 | Trading Liabilities | Interest Rate Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	28,406	[7]	27,201	[7]
Level 2 | Trading Liabilities | Foreign Exchange Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	104	[7]	44	[7]
Level 2 | Trading Liabilities | Equity Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	288	[7]	200	[7]
Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets	133		160
Other assets	138	[1]	157	[1]
Total assets	313		365
Trading liabilities	302		314
Total liabilities	302		314
Percentage of liabilities prior to netting	1.00%		1.00%
Level 3 | Available-for-sale
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	42		48
Level 3 | Available-for-sale | State And Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	42	[2]	45	[2]
Level 3 | Available-for-sale | Other Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale			3
Level 3 | Trading Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Debt and equity instruments	60	[6]	63	[6]
Derivative assets	73	[7]	97	[7]
Level 3 | Trading Assets | Interest Rate Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	34	[7]	54	[7]
Level 3 | Trading Assets | Equity Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	39	[7]	43	[7]
Level 3 | Operations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets	313		365
Total liabilities	302		314
Percentage of liabilities prior to netting	1.00%		1.00%
Level 3 | Trading Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	302	[7]	314	[7]
Level 3 | Trading Liabilities | Interest Rate Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	231	[7]	239	[7]
Level 3 | Trading Liabilities | Equity Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	71	[7]	75	[7]
Netting
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets	(27,357)	[8]	(26,047)	[8]
Total assets	(27,357)	[8]	(26,047)	[8]
Trading liabilities	(26,316)	[8]	(25,009)	[8]
Total liabilities	(26,316)	[8]	(25,009)	[8]
Netting | Trading Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative assets	(27,357)	[7],[8]	(26,047)	[7],[8]
Netting | Operations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets	(27,357)	[8]	(26,047)	[8]
Total liabilities	(26,316)	[8]	(25,009)	[8]
Netting | Trading Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative liabilities	$ (26,316)	[7],[8]	$ (25,009)	[7],[8]

[1] Includes private equity investments, seed capital, a brokerage account, and derivatives in designated hedging relationships.

[2] Includes certain interests in securitizations.

[3] Includes the fair value adjustment for certain unfunded lending-related commitments and derivatives in designated hedging relationships and support agreements.

[4] At June 30, 2012 and Dec. 31, 2011, the German foreign covered bonds were considered Level 1 in the valuation hierarchy. All other assets in the table above are primarily Level 2 assets in the valuation hierarchy.

[5] Previously included in the Grantor Trust.

[6] Includes loans classified as trading assets and certain interests in securitizations.

[7] The Level 1, 2 and 3 fair values of derivative assets and derivative liabilities are presented on a gross basis.

[8] ASC 815 permits the netting of derivative receivables and derivative payables under legally enforceable master netting agreements and permits the netting of cash collateral. Netting cannot be disaggregated by product.