Fair Value Measurements - Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	$ 30,468		$ 46,142
Gross Balance, Liabilities	609		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	41		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	[1]	0	[1]
Level 1 [Member] | Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	457		207
Level 1 [Member] | Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	152	[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	104	[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	3	[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	45	[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	2,277		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] | Student Loans [Member] | Residential Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	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] | Trading securities, excluding derivatives [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
Level 1 [Member] | Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	181	[2]	237	[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, Assets	73	[2]	98	[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, Assets	1	[2]	4	[2]
Level 1 [Member] | Derivatives [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] | Derivatives [Member] | Precious metals contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	107	[2]	135	[2]
Level 1 [Member] | Derivatives [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] | Derivatives [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	27,969		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	[4]	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	[5]	0	[5]
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	113,904		133,451
Gross Balance, Liabilities	92,013		107,412
Level 2 [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	164		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	887		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	3,860		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	5,182	[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	4,013		5,767
Level 2 [Member] | Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	76,532	[2]	88,738	[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	55,596	[2]	66,258	[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	13,800	[2]	13,770	[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	1,232	[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	1,016	[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	4,888	[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	6,286	[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	3		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	10,587		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	278		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	0		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	163		221
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Student Loans [Member] | Residential Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	74
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	967		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	4,481		5,609
Level 2 [Member] | Trading securities, excluding derivatives [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	16
Level 2 [Member] | Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	77,267	[2]	88,630	[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, Assets	55,684	[2]	66,602	[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, Assets	14,114	[2]	13,825	[2]
Level 2 [Member] | Derivatives [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	1,688	[2]	1,593	[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, Assets	1,175	[2]	649	[2]
Level 2 [Member] | Derivatives [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	4,606	[2]	5,961	[2]
Level 2 [Member] | Derivatives [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	0		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	13,804		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	2		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	135		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	230		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	103		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	858		912
Level 2 [Member] | Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	1	[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	[5]	0	[5]
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	3,192		4,479
Gross Balance, Liabilities	3,848		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	2,669	[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	618	[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	31	[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	175	[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	2	[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	408	[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	561	[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	1,513		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	245		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] | Student Loans [Member] | Residential Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	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	192		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	121		311
Level 3 [Member] | Trading securities, excluding derivatives [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
Level 3 [Member] | Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	897	[2]	1,365	[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, Assets	2	[2]	8	[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, Assets	136	[2]	16	[2]
Level 3 [Member] | Derivatives [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	137	[2]	166	[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, Assets	1	[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, Assets	621	[2]	1,168	[2]
Level 3 [Member] | Derivatives [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	[4]	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	224	[5]	168	[5]
Estimate of fair value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	147,564		184,072
Netting, Assets	(72,300)	[6]	(83,367)	[6]
Net Balance, Assets	75,264		100,705
Gross Balance, Liabilities	96,470		111,607
Netting, Liabilities	(69,925)	[6]	(79,580)	[6]
Net Balance, Liabilities	26,545		32,027
Estimate of fair value [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	164		173
Net Balance, Assets	164		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	887		831
Net Balance, Assets	887		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	3,901		4,522
Net Balance, Assets	3,901		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	7,851	[1]	8,692	[1]
Net Balance, Liabilities	7,851	[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	4,470		5,974
Net Balance, Liabilities	4,470		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	77,302	[2]	89,661	[2]
Netting, Liabilities	(69,925)	[2],[6]	(79,580)	[2],[6]
Net Balance, Liabilities	7,377	[2]	10,081	[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	55,702	[2]	66,349	[2]
Netting, Liabilities	0	[2],[6]	0	[2],[6]
Net Balance, Liabilities	55,702	[2]	66,349	[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	13,834	[2]	13,806	[2]
Netting, Liabilities	0	[2],[6]	0	[2],[6]
Net Balance, Liabilities	13,834	[2]	13,806	[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	1,407	[2]	1,417	[2]
Netting, Liabilities	0	[2],[6]	0	[2],[6]
Net Balance, Liabilities	1,407	[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	1,063	[2]	738	[2]
Netting, Liabilities	0	[2],[6]	0	[2],[6]
Net Balance, Liabilities	1,063	[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	5,296	[2]	7,351	[2]
Netting, Liabilities	0	[2],[6]	0	[2],[6]
Net Balance, Liabilities	5,296	[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	(69,925)	[2],[6]	(79,580)	[2],[6]
Net Balance, Liabilities	(69,925)	[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	6,847	[3]	7,280	[3]
Netting, Liabilities	0	[3],[6]
Net Balance, Liabilities	6,847	[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	1,516		2,896
Net Balance, Assets	1,516		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	10,587		12,332
Net Balance, Assets	10,587		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	2,555		2,853
Net Balance, Assets	2,555		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	245		466
Net Balance, Assets	245		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	163		221
Net Balance, Assets	163		221
Estimate of fair value [Member] | Trading securities, excluding derivatives [Member] | Student Loans [Member] | Residential Mortgage [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	74
Net Balance, Assets	74
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	1,159		767
Net Balance, Assets	1,159		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	4,602		5,920
Net Balance, Assets	4,602		5,920
Estimate of fair value [Member] | Trading securities, excluding derivatives [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	16
Net Balance, Assets	16
Estimate of fair value [Member] | Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	78,345	[2]	90,232	[2]
Netting, Assets	(72,300)	[2],[6]	(83,367)	[2],[6]
Net Balance, Assets	6,045	[2]	6,865	[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, Assets	55,759	[2]	66,708	[2]
Netting, Assets	0	[2],[6]	0	[2],[6]
Net Balance, Assets	55,759	[2]	66,708	[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, Assets	14,251	[2]	13,845	[2]
Netting, Assets	0	[2],[6]	0	[2],[6]
Net Balance, Assets	14,251	[2]	13,845	[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, Assets	1,825	[2]	1,759	[2]
Netting, Assets	0	[2],[6]	0	[2],[6]
Net Balance, Assets	1,825	[2]	1,759	[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, Assets	1,283	[2]	791	[2]
Netting, Assets	0	[2],[6]	0	[2],[6]
Net Balance, Assets	1,283	[2]	791	[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, Assets	5,227	[2]	7,129	[2]
Netting, Assets	0	[2],[6]	0	[2],[6]
Net Balance, Assets	5,227	[2]	7,129	[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, Assets	0	[2]	0	[2]
Netting, Assets	(72,300)	[2],[6]	(83,367)	[2],[6]
Net Balance, Assets	(72,300)	[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	0		26
Net Balance, Assets	0		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	41,773		60,695
Net Balance, Assets	41,773		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	2		1
Net Balance, Assets	2		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	135		214
Net Balance, Assets	135		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	230		258
Net Balance, Assets	230		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	103		84
Net Balance, Assets	103		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	858		912
Net Balance, Assets	858		912
Estimate of fair value [Member] | Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	1	[4]	465	[4]
Net Balance, Assets	1	[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	224	[5]	168	[5]
Net Balance, Assets	$ 224	[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 $4.6 billion and $5.4 billion and trading derivative liabilities of $6.6 billion and $8.7 billion as of September 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.