Fair Value Measurements - Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	$ 189,193		$ 178,729
Netting, Assets	(83,367)	[1]	(84,996)	[1]
Net Balance, Assets	105,826		93,733
Gross Balance, Liabilities	116,728		117,170
Net Liabilities	(79,580)	[1]	(86,546)	[1]
Net Balance, Liabilities	37,148		30,624
Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	173		140
Net Balance, Assets	173		140
Foreign debt securities [Member] | Large corporate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	831		1,235
Net Balance, Assets	831		1,235
Foreign debt securities [Member] | US Government Agency Issued or Guaranteed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	4,522		5,335
Net Balance, Assets	4,522		5,335
Deposits in domestic offices
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	8,692		9,799	[2]
Net Balance, Liabilities	8,692	[2]	9,799	[2]
Trading liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	5,974		7,342
Net Balance, Liabilities	5,974		7,342
Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	94,782	[3]	94,986	[3]
Net Liabilities	(79,580)	[1],[3]	(86,546)	[1],[3]
Net Balance, Liabilities	15,202	[3]	8,440	[3]
Derivatives [Member] | Interest rate contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	71,658	[3]	62,768	[3]
Net Balance, Liabilities	71,658	[3]	62,768	[3]
Derivatives [Member] | Foreign exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	13,618	[3]	15,426	[3]
Net Balance, Liabilities	13,618	[3]	15,426	[3]
Derivatives [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	1,417	[3]	1,251	[3]
Net Balance, Liabilities	1,417	[3]	1,251	[3]
Derivatives [Member] | Precious metals contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	738	[3]	1,248	[3]
Net Balance, Liabilities	738	[3]	1,248	[3]
Derivatives [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	7,351	[3]	14,293	[3]
Net Balance, Liabilities	7,351	[3]	14,293	[3]
Derivatives [Member] | Derivatives netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Liabilities	(79,580)		(86,546)	[1],[3]
Net Balance, Liabilities	(79,580)	[3]	(86,546)	[3]
Long-term Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	7,280		5,043	[4]
Net Balance, Liabilities	7,280	[4]	5,043	[4]
Trading securities, excluding derivatives [Member] | Corporate and other domestic debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	2,896		1,905
Net Balance, Assets	2,896		1,905
Trading securities, excluding derivatives [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	36		40
Net Balance, Assets	36		40
Trading securities, excluding derivatives [Member] | Commodities Investment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	12,332		17,082
Net Balance, Assets	12,332		17,082
Trading securities, excluding derivatives [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	2,853		297
Net Balance, Assets	2,853		297
Trading securities, excluding derivatives [Member] | Collateralized debt obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	466		755
Net Balance, Assets	466		755
Trading securities, excluding derivatives [Member] | Asset backed securities [Member] | Residential Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	221		274
Net Balance, Assets	221		274
Trading securities, excluding derivatives [Member] | Asset backed securities [Member] | Home Equity Line of Credit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets			1
Net Balance, Assets			1
Trading securities, excluding derivatives [Member] | Asset backed securities [Member] | Student Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets			2
Net Balance, Assets			2
Trading securities, excluding derivatives [Member] | Foreign debt securities [Member] | Large corporate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	767		2,211
Net Balance, Assets	767		2,211
Trading securities, excluding derivatives [Member] | Foreign debt securities [Member] | US Government Agency Issued or Guaranteed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	5,920		7,461
Net Balance, Assets	5,920		7,461
Derivative Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	95,353	[3]	94,822	[3]
Netting, Assets	(83,367)	[1],[3]	(84,996)	[1],[3]
Net Balance, Assets	11,986	[3]	9,826	[3]
Derivative Assets [Member] | Interest rate contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	71,823	[3]	61,709	[3]
Net Balance, Assets	71,823	[3]	61,709	[3]
Derivative Assets [Member] | Foreign exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	13,851	[3]	15,665	[3]
Net Balance, Assets	13,851	[3]	15,665	[3]
Derivative Assets [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	1,759	[3]	1,216	[3]
Net Balance, Assets	1,759	[3]	1,216	[3]
Derivative Assets [Member] | Precious metals contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	791	[3]	1,842	[3]
Net Balance, Assets	791	[3]	1,842	[3]
Derivative Assets [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	7,129	[3]	14,390	[3]
Net Balance, Assets	7,129	[3]	14,390	[3]
Derivative Assets [Member] | Derivatives netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Netting, Assets	(83,367)		(84,996)	[1],[3]
Net Balance, Assets	(83,367)	[3]	(84,996)	[3]
Available-for-sale Securities [Member] | Corporate and other domestic debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	26		544
Net Balance, Assets	26		544
Available-for-sale Securities [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	60,695	[3]	44,609
Net Balance, Assets	60,695		44,609
Available-for-sale Securities [Member] | Asset backed securities [Member] | Residential Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	1		5
Net Balance, Assets	1		5
Available-for-sale Securities [Member] | Asset backed securities [Member] | Commercial mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	214		451
Net Balance, Assets	214		451
Available-for-sale Securities [Member] | Asset backed securities [Member] | Home Equity Line of Credit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	258		270
Net Balance, Assets	258		270
Available-for-sale Securities [Member] | Asset backed securities [Member] | Student Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets			12
Net Balance, Assets			12
Available-for-sale Securities [Member] | Asset backed securities [Member] | Others [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	84		80
Net Balance, Assets	84		80
Available-for-sale Securities [Member] | Obligations of U.S. states and political subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	912		600
Net Balance, Assets	912		600
Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	465	[5]	378	[5]
Net Balance, Assets	465	[5]	378	[5]
Intangible Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	168	[6]	220	[6]
Net Balance, Assets	168	[6]	220	[6]
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	46,142		23,076
Gross Balance, Liabilities	341		432
Level 1 [Member] | Foreign debt securities [Member] | US Government Agency Issued or Guaranteed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	42		40
Level 1 [Member] | Trading liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	207		321
Level 1 [Member] | Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	134	[3]	111	[3]
Level 1 [Member] | Derivatives [Member] | Interest rate contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	90	[3]	66	[3]
Level 1 [Member] | Derivatives [Member] | Foreign exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	25	[3]	13	[3]
Level 1 [Member] | Derivatives [Member] | Precious metals contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	19	[3]	32	[3]
Level 1 [Member] | Trading securities, excluding derivatives [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	2,484		259
Level 1 [Member] | Derivative Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	237	[3]	310	[3]
Level 1 [Member] | Derivative Assets [Member] | Interest rate contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	98	[3]	135	[3]
Level 1 [Member] | Derivative Assets [Member] | Foreign exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	4	[3]	4	[3]
Level 1 [Member] | Derivative Assets [Member] | Precious metals contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	135	[3]	171	[3]
Level 1 [Member] | Available-for-sale Securities [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	43,379		22,467
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	138,572		150,252
Gross Balance, Liabilities	112,533		112,541
Level 2 [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	173		140
Level 2 [Member] | Foreign debt securities [Member] | Large corporate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	831		1,235
Level 2 [Member] | Foreign debt securities [Member] | US Government Agency Issued or Guaranteed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	4,480		5,295
Level 2 [Member] | Deposits in domestic offices
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	6,056	[2]	6,932	[2]
Level 2 [Member] | Trading liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	5,767		7,021
Level 2 [Member] | Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	93,859	[3]	93,631	[3]
Level 2 [Member] | Derivatives [Member] | Interest rate contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	71,567	[3]	62,702	[3]
Level 2 [Member] | Derivatives [Member] | Foreign exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	13,582	[3]	15,191	[3]
Level 2 [Member] | Derivatives [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	1,244	[3]	999	[3]
Level 2 [Member] | Derivatives [Member] | Precious metals contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	712	[3]	1,186	[3]
Level 2 [Member] | Derivatives [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	6,754	[3]	13,553	[3]
Level 2 [Member] | Long-term Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	6,851	[4]	4,957	[4]
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Corporate and other domestic debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	1,035		226
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	27		27
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Commodities Investment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	12,332		17,082
Level 2 [Member] | Trading securities, excluding derivatives [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	369		38
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Collateralized debt obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets			52
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Asset backed securities [Member] | Residential Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	221		274
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Asset backed securities [Member] | Home Equity Line of Credit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets			1
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Asset backed securities [Member] | Student Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets			2
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Foreign debt securities [Member] | Large corporate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	468		1,958
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Foreign debt securities [Member] | US Government Agency Issued or Guaranteed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	5,609		7,461
Level 2 [Member] | Derivative Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	93,751	[3]	91,990	[3]
Level 2 [Member] | Derivative Assets [Member] | Interest rate contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	71,717	[3]	61,565	[3]
Level 2 [Member] | Derivative Assets [Member] | Foreign exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	13,831	[3]	15,440	[3]
Level 2 [Member] | Derivative Assets [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	1,593	[3]	1,047	[3]
Level 2 [Member] | Derivative Assets [Member] | Precious metals contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	649	[3]	1,641	[3]
Level 2 [Member] | Derivative Assets [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	5,961	[3]	12,297	[3]
Level 2 [Member] | Available-for-sale Securities [Member] | Corporate and other domestic debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	26		544
Level 2 [Member] | Available-for-sale Securities [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	17,316		22,142
Level 2 [Member] | Available-for-sale Securities [Member] | Asset backed securities [Member] | Residential Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	1		5
Level 2 [Member] | Available-for-sale Securities [Member] | Asset backed securities [Member] | Commercial mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	214		451
Level 2 [Member] | Available-for-sale Securities [Member] | Asset backed securities [Member] | Home Equity Line of Credit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	258		270
Level 2 [Member] | Available-for-sale Securities [Member] | Asset backed securities [Member] | Student Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets			12
Level 2 [Member] | Available-for-sale Securities [Member] | Asset backed securities [Member] | Others [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	84		80
Level 2 [Member] | Available-for-sale Securities [Member] | Obligations of U.S. states and political subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	912		600
Level 2 [Member] | Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	465	[5]	367	[5]
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	4,479		5,401
Gross Balance, Liabilities	3,854		4,197
Level 3 [Member] | Deposits in domestic offices
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	2,636	[2]	2,867	[2]
Level 3 [Member] | Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	789		1,244
Level 3 [Member] | Derivatives [Member] | Interest rate contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	1	[3]	0	[3]
Level 3 [Member] | Derivatives [Member] | Foreign exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	11	[3]	222	[3]
Level 3 [Member] | Derivatives [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	173	[3]	252	[3]
Level 3 [Member] | Derivatives [Member] | Precious metals contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	7	[3]	30	[3]
Level 3 [Member] | Derivatives [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	597	[3]	740	[3]
Level 3 [Member] | Long-term Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	429	[4]	86	[4]
Level 3 [Member] | Trading securities, excluding derivatives [Member] | Corporate and other domestic debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	1,861		1,679
Level 3 [Member] | Trading securities, excluding derivatives [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	9		13
Level 3 [Member] | Trading securities, excluding derivatives [Member] | Collateralized debt obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	466		703
Level 3 [Member] | Trading securities, excluding derivatives [Member] | Foreign debt securities [Member] | Large corporate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	299		253
Level 3 [Member] | Trading securities, excluding derivatives [Member] | Foreign debt securities [Member] | US Government Agency Issued or Guaranteed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	311
Level 3 [Member] | Derivative Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	1,365		2,522
Level 3 [Member] | Derivative Assets [Member] | Interest rate contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	8	[3]	9	[3]
Level 3 [Member] | Derivative Assets [Member] | Foreign exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	16	[3]	221	[3]
Level 3 [Member] | Derivative Assets [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	166	[3]	169	[3]
Level 3 [Member] | Derivative Assets [Member] | Precious metals contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	7	[3]	30	[3]
Level 3 [Member] | Derivative Assets [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	1,168	[3]	2,093	[3]
Level 3 [Member] | Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets			11	[5]
Level 3 [Member] | Intangible Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	$ 168	[6]	$ 220	[6]

[1] Represents counterparty and cash collateral netting which allow the offsetting of amounts relating to certain contracts if certain conditions are met.

[2] Represents structured deposits risk-managed on a fair value basis for which we have elected to apply the fair value option.

[3] Includes trading derivative assets of $10.5 billion and $8.8 billion and trading derivative liabilities of $13.8 billion and $6.8 billion as of December 31, 2012 and 2011, respectively, as well as derivatives held for hedging and commitments accounted for as derivatives.

[4] Includes structured notes and own debt issuances which we have elected to measure on a fair value basis.

[5] Includes leveraged acquisition finance and other commercial loans held for sale or risk-managed on a fair value basis for which we have elected to apply the fair value option. See Note 10, “Loans Held for Sale,” for further information.

[6] See Note 12, “Intangible Assets,” for additional information.