Fair Value Measurements - Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	$ 31,950		$ 46,142
Gross Balance, Liabilities	471		341
Level 1 [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 1 [Member] | Foreign debt securities [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 1 [Member] | Foreign debt securities [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	40		42
Level 1 [Member] | Deposits in domestic offices
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	0		0	[1]
Level 1 [Member] | Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	236		207
Level 1 [Member] | Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	235	[2]	134	[2]
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	83	[2]	90	[2]
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	4	[2]	25	[2]
Level 1 [Member] | Derivatives [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	0	[2]	0	[2]
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	148	[2]	19	[2]
Level 1 [Member] | Derivatives [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	0	[2]	0	[2]
Level 1 [Member] | Derivatives [Member] | Derivatives netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	0	[2]	0	[2]
Level 1 [Member] | Long-term Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	0	[3]	0	[3]
Level 1 [Member] | Trading securities, excluding derivatives [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 1 [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	0		0
Level 1 [Member] | Trading securities, excluding derivatives [Member] | Precious metals [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0		0
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	1,530		2,484
Level 1 [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	0		0
Level 1 [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	0		0
Level 1 [Member] | Trading securities, excluding derivatives [Member] | Foreign debt securities [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 1 [Member] | Trading securities, excluding derivatives [Member] | Foreign debt securities [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 1 [Member] | Derivative Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	847	[2]	237	[2]
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	74	[2]	98	[2]
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	5	[2]	4	[2]
Level 1 [Member] | Derivative Assets [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0	[2]	0	[2]
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	768	[2]	135	[2]
Level 1 [Member] | Derivative Assets [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0	[2]	0	[2]
Level 1 [Member] | Derivative Assets [Member] | Derivatives netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0	[2]	0	[2]
Level 1 [Member] | Available-for-sale Securities [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0		0
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	29,533		43,379
Level 1 [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	0		0
Level 1 [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	0		0
Level 1 [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	0		0
Level 1 [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	0		0
Level 1 [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	0		0
Level 1 [Member] | Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0		0	[4]
Level 1 [Member] | Mortgage servicing rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0		0	[5]
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	121,080		138,572
Gross Balance, Liabilities	97,782		112,533
Level 2 [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	165		173
Level 2 [Member] | Foreign debt securities [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	891		831
Level 2 [Member] | Foreign debt securities [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	4,023		4,480
Level 2 [Member] | Deposits in domestic offices
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	5,288	[1]	6,056	[1]
Level 2 [Member] | Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	4,800		5,767
Level 2 [Member] | Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	81,526	[2]	93,859	[2]
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	57,217	[2]	71,567	[2]
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	15,522	[2]	13,582	[2]
Level 2 [Member] | Derivatives [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	1,335	[2]	1,244	[2]
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	1,960	[2]	712	[2]
Level 2 [Member] | Derivatives [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	5,492	[2]	6,754	[2]
Level 2 [Member] | Derivatives [Member] | Derivatives netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	0	[2]	0	[2]
Level 2 [Member] | Long-term Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	6,168	[3]	6,851	[3]
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	2		1,035
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	24		27
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Precious metals [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	9,397		12,332
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	197		369
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	75		0
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	167		221
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Foreign debt securities [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	681		468
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Foreign debt securities [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	4,229		5,609
Level 2 [Member] | Derivative Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	83,020	[2]	93,751	[2]
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	57,233	[2]	71,717	[2]
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	15,972	[2]	13,831	[2]
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	1,698	[2]	1,593	[2]
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	2,881	[2]	649	[2]
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	5,236	[2]	5,961	[2]
Level 2 [Member] | Derivative Assets [Member] | Derivatives netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0	[2]	0	[2]
Level 2 [Member] | Available-for-sale Securities [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	24		26
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	16,797		17,316
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		1
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	166		214
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	245		258
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	104		84
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	869		912
Level 2 [Member] | Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	3	[4]	465	[4]
Level 2 [Member] | Mortgage servicing rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0		0	[5]
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	3,355		4,479
Gross Balance, Liabilities	3,860		3,854
Level 3 [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 3 [Member] | Foreign debt securities [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 3 [Member] | Foreign debt securities [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 3 [Member] | Deposits in domestic offices
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	2,662	[1]	2,636	[1]
Level 3 [Member] | Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	0		0
Level 3 [Member] | Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	740	[2]	789	[2]
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	2	[2]	1	[2]
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	71	[2]	11	[2]
Level 3 [Member] | Derivatives [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	223	[2]	173	[2]
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	0	[2]	7	[2]
Level 3 [Member] | Derivatives [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	444	[2]	597	[2]
Level 3 [Member] | Derivatives [Member] | Derivatives netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	0	[2]	0	[2]
Level 3 [Member] | Long-term Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	458	[3]	429	[3]
Level 3 [Member] | Trading securities, excluding derivatives [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	1,498		1,861
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	0		9
Level 3 [Member] | Trading securities, excluding derivatives [Member] | Precious metals [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 3 [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	0		0
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	227		466
Level 3 [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	0		0
Level 3 [Member] | Trading securities, excluding derivatives [Member] | Foreign debt securities [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	285		299
Level 3 [Member] | Trading securities, excluding derivatives [Member] | Foreign debt securities [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	135		311
Level 3 [Member] | Derivative Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	985	[2]	1,365	[2]
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	1	[2]	8	[2]
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	175	[2]	16	[2]
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	140	[2]	166	[2]
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	0	[2]	7	[2]
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	669	[2]	1,168	[2]
Level 3 [Member] | Derivative Assets [Member] | Derivatives netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0	[2]	0	[2]
Level 3 [Member] | Available-for-sale Securities [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 3 [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	0		0
Level 3 [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	0		0
Level 3 [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	0		0
Level 3 [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	0		0
Level 3 [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	0		0
Level 3 [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	0		0
Level 3 [Member] | Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0		0	[4]
Level 3 [Member] | Mortgage servicing rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	225	[5]	168	[5]
Estimate of fair value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	156,385		189,193
Netting, Assets	(74,400)	[6]	(83,367)	[6]
Net Balance, Assets	81,985		105,826
Gross Balance, Liabilities	102,113		116,728
Netting, Liabilities	(71,290)	[6]	(79,580)	[6]
Net Balance, Liabilities	30,823		37,148
Estimate of fair value [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	165		173
Net Balance, Assets	165		173
Estimate of fair value [Member] | Foreign debt securities [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	891		831
Net Balance, Assets	891		831
Estimate of fair value [Member] | Foreign debt securities [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	4,063		4,522
Net Balance, Assets	4,063		4,522
Estimate of fair value [Member] | Deposits in domestic offices
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	7,950		8,692	[1]
Net Balance, Liabilities	7,950	[1]	8,692	[1]
Estimate of fair value [Member] | Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	5,036		5,974
Net Balance, Liabilities	5,036		5,974
Estimate of fair value [Member] | Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	82,501	[2]	94,782	[2]
Netting, Liabilities	(71,290)	[2],[6]	(79,580)	[2],[6]
Net Balance, Liabilities	11,211	[2]	15,202	[2]
Estimate of fair value [Member] | Derivatives [Member] | Interest rate contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	57,302	[2]	71,658	[2]
Netting, Liabilities	0	[2],[6]	0	[2],[6]
Net Balance, Liabilities	57,302	[2]	71,658	[2]
Estimate of fair value [Member] | Derivatives [Member] | Foreign exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	15,597	[2]	13,618	[2]
Netting, Liabilities	0	[2],[6]	0	[2],[6]
Net Balance, Liabilities	15,597	[2]	13,618	[2]
Estimate of fair value [Member] | Derivatives [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	1,558	[2]	1,417	[2]
Netting, Liabilities	0	[2],[6]	0	[2],[6]
Net Balance, Liabilities	1,558	[2]	1,417	[2]
Estimate of fair value [Member] | Derivatives [Member] | Precious metals contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	2,108	[2]	738	[2]
Netting, Liabilities	0	[2],[6]	0	[2],[6]
Net Balance, Liabilities	2,108	[2]	738	[2]
Estimate of fair value [Member] | Derivatives [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	5,936	[2]	7,351	[2]
Netting, Liabilities	0	[2],[6]	0	[2],[6]
Net Balance, Liabilities	5,936	[2]	7,351	[2]
Estimate of fair value [Member] | Derivatives [Member] | Derivatives netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	0	[2]	0	[2]
Netting, Liabilities	(71,290)	[2],[6]	(79,580)	[2],[6]
Net Balance, Liabilities	(71,290)	[2]	(79,580)	[2]
Estimate of fair value [Member] | Long-term Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	6,626	[3]	7,280	[3]
Netting, Liabilities	0	[3],[6]
Net Balance, Liabilities	6,626	[3]	7,280	[3]
Estimate of fair value [Member] | Trading securities, excluding derivatives [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	1,500		2,896
Net Balance, Assets	1,500		2,896
Estimate of fair value [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	24		36
Net Balance, Assets	24		36
Estimate of fair value [Member] | Trading securities, excluding derivatives [Member] | Precious metals [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	9,397		12,332
Net Balance, Assets	9,397		12,332
Estimate of fair value [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	1,727		2,853
Net Balance, Assets	1,727		2,853
Estimate of fair value [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	302		466
Net Balance, Assets	302		466
Estimate of fair value [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	167		221
Net Balance, Assets	167		221
Estimate of fair value [Member] | Trading securities, excluding derivatives [Member] | Foreign debt securities [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	966		767
Net Balance, Assets	966		767
Estimate of fair value [Member] | Trading securities, excluding derivatives [Member] | Foreign debt securities [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	4,364		5,920
Net Balance, Assets	4,364		5,920
Estimate of fair value [Member] | Derivative Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	84,852	[2]	95,353	[2]
Netting, Assets	(74,400)	[2],[6]	(83,367)	[2],[6]
Net Balance, Assets	10,452	[2]	11,986	[2]
Estimate of fair value [Member] | Derivative Assets [Member] | Interest rate contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	57,308	[2]	71,823	[2]
Netting, Assets	0	[2],[6]	0	[2],[6]
Net Balance, Assets	57,308	[2]	71,823	[2]
Estimate of fair value [Member] | Derivative Assets [Member] | Foreign exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	16,152	[2]	13,851	[2]
Netting, Assets	0	[2],[6]	0	[2],[6]
Net Balance, Assets	16,152	[2]	13,851	[2]
Estimate of fair value [Member] | Derivative Assets [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	1,838	[2]	1,759	[2]
Netting, Assets	0	[2],[6]	0	[2],[6]
Net Balance, Assets	1,838	[2]	1,759	[2]
Estimate of fair value [Member] | Derivative Assets [Member] | Precious metals contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	3,649	[2]	791	[2]
Netting, Assets	0	[2],[6]	0	[2],[6]
Net Balance, Assets	3,649	[2]	791	[2]
Estimate of fair value [Member] | Derivative Assets [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	5,905	[2]	7,129	[2]
Netting, Assets	0	[2],[6]	0	[2],[6]
Net Balance, Assets	5,905	[2]	7,129	[2]
Estimate of fair value [Member] | Derivative Assets [Member] | Derivatives netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0	[2]	0	[2]
Netting, Assets	(74,400)	[2],[6]	(83,367)	[2],[6]
Net Balance, Assets	(74,400)	[2]	(83,367)	[2]
Estimate of fair value [Member] | Available-for-sale Securities [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	24		26
Net Balance, Assets	24		26
Estimate of fair value [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	46,330		60,695
Net Balance, Assets	46,330		60,695
Estimate of fair value [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		1
Net Balance, Assets	1		1
Estimate of fair value [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	166		214
Net Balance, Assets	166		214
Estimate of fair value [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	245		258
Net Balance, Assets	245		258
Estimate of fair value [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	104		84
Net Balance, Assets	104		84
Estimate of fair value [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	869		912
Net Balance, Assets	869		912
Estimate of fair value [Member] | Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	3	[4]	465	[4]
Net Balance, Assets	3	[4]	465	[4]
Estimate of fair value [Member] | Mortgage servicing rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	225	[5]	168	[5]
Net Balance, Assets	$ 225	[5]	$ 168	[5]

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

[2] Includes trading derivative assets of $9.0 billion and $10.5 billion and trading derivative liabilities of $10.3 billion and $13.8 billion as of June 30, 2013 and December 31, 2012, respectively, as well as derivatives held for hedging and commitments accounted for as derivatives.

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

[4] 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 7, “Loans Held for Sale,” for further information.

[5] See Note 8, “Intangible Assets,” for additional information.

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