Fair Value Measurements - Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	$ 41,459		$ 41,167
Gross Balance, Liabilities	435		365
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] | Debt Securities issued by foreign entities [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] | Debt Securities issued by foreign entities [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0		40
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	367		308
Level 1 [Member] | Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	68	[2]	57	[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	33	[2]	34	[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	11	[2]	16	[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	24	[2]	7	[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, U.S. Government agencies and sponsored enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	2,140		1,344
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		0
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] | Asset backed securities [Member] | Student Loans [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] | Debt Securities issued by foreign entities [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] | Debt Securities issued by foreign entities [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] | Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	166	[2]	270	[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	88	[2]	81	[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	26	[2]	7	[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	52	[2]	182	[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] | Securities available-for-sale [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] | Securities available-for-sale [Member] | U.S. Treasury, U.S. Government agencies and sponsored enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	39,153		39,513
Level 1 [Member] | Securities available-for-sale [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] | Securities available-for-sale [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] | Securities available-for-sale [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] | Securities available-for-sale [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] | Securities available-for-sale [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] | 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	104,222		113,315
Gross Balance, Liabilities	86,644		93,424
Level 2 [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	163		162
Level 2 [Member] | Debt Securities issued by foreign entities [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	874		881
Level 2 [Member] | Debt Securities issued by foreign entities [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	3,772		3,681
Level 2 [Member] | Deposits in domestic offices
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	5,393	[1]	5,406	[1]
Level 2 [Member] | Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	3,993		3,826
Level 2 [Member] | Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	70,299	[2]	77,506	[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	51,348	[2]	56,282	[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	12,541	[2]	14,576	[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	1,312	[2]	1,403	[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	817	[2]	847	[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	4,281	[2]	4,398	[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	6,959	[3]	6,686	[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	0		0
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	21		25
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	10,332		11,751
Level 2 [Member] | Trading securities, excluding derivatives [Member] | U.S. Treasury, U.S. Government agencies and sponsored enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	81		178
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	25		25
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	158		159
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	68		68
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Debt Securities issued by foreign entities [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	107		495
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Debt Securities issued by foreign entities [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	7,233		6,223
Level 2 [Member] | Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	71,009	[2]	78,980	[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	50,846	[2]	56,095	[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	13,523	[2]	15,291	[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	1,983	[2]	2,042	[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	784	[2]	1,400	[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	3,873	[2]	4,152	[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] | Securities available-for-sale [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 2 [Member] | Securities available-for-sale [Member] | U.S. Treasury, U.S. Government agencies and sponsored enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	8,478		9,439
Level 2 [Member] | Securities available-for-sale [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	737		742
Level 2 [Member] | Securities available-for-sale [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] | Securities available-for-sale [Member] | Asset backed securities [Member] | Commercial mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	96		126
Level 2 [Member] | Securities available-for-sale [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	220		227
Level 2 [Member] | Securities available-for-sale [Member] | Asset backed securities [Member] | Others [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	94		94
Level 2 [Member] | Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	753	[4]	58	[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	4,082		3,667
Gross Balance, Liabilities	3,368		3,751
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] | Debt Securities issued by foreign entities [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] | Debt Securities issued by foreign entities [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	2,244	[1]	2,334	[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	392	[2]	517	[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	0	[2]	0	[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	30	[2]	36	[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	130	[2]	157	[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]	3	[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	232	[2]	321	[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	732	[3]	900	[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	2,808		2,260
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		0
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, U.S. Government agencies and sponsored enterprises [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] | 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] | 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	258		254
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] | Asset backed securities [Member] | Student Loans [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] | Debt Securities issued by foreign entities [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] | Trading securities, excluding derivatives [Member] | Debt Securities issued by foreign entities [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	117		121
Level 3 [Member] | Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	694	[2]	805	[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	1	[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, Assets	126	[2]	131	[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	154	[2]	160	[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	0	[2]	1	[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	413	[2]	512	[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] | Securities available-for-sale [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] | Securities available-for-sale [Member] | U.S. Treasury, U.S. Government agencies and sponsored enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 3 [Member] | Securities available-for-sale [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] | Securities available-for-sale [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] | Securities available-for-sale [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] | Securities available-for-sale [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] | Securities available-for-sale [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] | 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	205	[5]	227	[5]
Estimate of fair value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	149,763		158,149
Netting, Assets	(66,413)	[6]	(72,486)	[6]
Net Balance, Assets	83,350		85,663
Gross Balance, Liabilities	90,447		97,540
Netting, Liabilities	(65,111)	[6]	(70,732)	[6]
Net Balance, Liabilities	25,336		26,808
Estimate of fair value [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	163		162
Net Balance, Assets	163		162
Estimate of fair value [Member] | Debt Securities issued by foreign entities [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	874		881
Net Balance, Assets	874		881
Estimate of fair value [Member] | Debt Securities issued by foreign entities [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	3,772		3,721
Net Balance, Assets	3,772		3,721
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	7,637	[1]	7,740	[1]
Net Balance, Liabilities	7,637	[1]	7,740	[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	4,360		4,134
Net Balance, Liabilities	4,360		4,134
Estimate of fair value [Member] | Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Liabilities	70,759	[2]	78,080	[2]
Netting, Liabilities	(65,111)	[2],[6]	(70,732)	[2],[6]
Net Balance, Liabilities	5,648	[2]	7,348	[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	51,381	[2]	56,316	[2]
Netting, Liabilities	0	[2],[6]	0	[2],[6]
Net Balance, Liabilities	51,381	[2]	56,316	[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	12,582	[2]	14,628	[2]
Netting, Liabilities	0	[2],[6]	0	[2],[6]
Net Balance, Liabilities	12,582	[2]	14,628	[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	1,442	[2]	1,560	[2]
Netting, Liabilities	0	[2],[6]	0	[2],[6]
Net Balance, Liabilities	1,442	[2]	1,560	[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	841	[2]	857	[2]
Netting, Liabilities	0	[2],[6]	0	[2],[6]
Net Balance, Liabilities	841	[2]	857	[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	4,513	[2]	4,719	[2]
Netting, Liabilities	0	[2],[6]	0	[2],[6]
Net Balance, Liabilities	4,513	[2]	4,719	[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	(65,111)	[2],[6]	(70,732)	[2],[6]
Net Balance, Liabilities	(65,111)	[2]	(70,732)	[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	7,691	[3]	7,586	[3]
Netting, Liabilities	0	[3],[6]
Net Balance, Liabilities	7,691	[3]	7,586	[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	2,808		2,260
Net Balance, Assets	2,808		2,260
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	21		25
Net Balance, Assets	21		25
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	10,332		11,751
Net Balance, Assets	10,332		11,751
Estimate of fair value [Member] | Trading securities, excluding derivatives [Member] | U.S. Treasury, U.S. Government agencies and sponsored enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	2,221		1,522
Net Balance, Assets	2,221		1,522
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	25		25
Net Balance, Assets	25		25
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	258		254
Net Balance, Assets	258		254
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	158		159
Net Balance, Assets	158		159
Estimate of fair value [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	68		68
Net Balance, Assets	68		68
Estimate of fair value [Member] | Trading securities, excluding derivatives [Member] | Debt Securities issued by foreign entities [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	107		495
Net Balance, Assets	107		495
Estimate of fair value [Member] | Trading securities, excluding derivatives [Member] | Debt Securities issued by foreign entities [Member] | Foreign Government Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	7,350		6,344
Net Balance, Assets	7,350		6,344
Estimate of fair value [Member] | Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	71,869	[2]	80,055	[2]
Netting, Assets	(66,413)	[2],[6]	(72,486)	[2],[6]
Net Balance, Assets	5,456	[2]	7,569	[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	50,935	[2]	56,177	[2]
Netting, Assets	0	[2],[6]	0	[2],[6]
Net Balance, Assets	50,935	[2]	56,177	[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	13,675	[2]	15,429	[2]
Netting, Assets	0	[2],[6]	0	[2],[6]
Net Balance, Assets	13,675	[2]	15,429	[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	2,137	[2]	2,202	[2]
Netting, Assets	0	[2],[6]	0	[2],[6]
Net Balance, Assets	2,137	[2]	2,202	[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	836	[2]	1,583	[2]
Netting, Assets	0	[2],[6]	0	[2],[6]
Net Balance, Assets	836	[2]	1,583	[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	4,286	[2]	4,664	[2]
Netting, Assets	0	[2],[6]	0	[2],[6]
Net Balance, Assets	4,286	[2]	4,664	[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	(66,413)	[2],[6]	(72,486)	[2],[6]
Net Balance, Assets	(66,413)	[2]	(72,486)	[2]
Estimate of fair value [Member] | Securities available-for-sale [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	0		0
Net Balance, Assets	0		0
Estimate of fair value [Member] | Securities available-for-sale [Member] | U.S. Treasury, U.S. Government agencies and sponsored enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	47,631		48,952
Net Balance, Assets	47,631		48,952
Estimate of fair value [Member] | Securities available-for-sale [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	737		742
Net Balance, Assets	737		742
Estimate of fair value [Member] | Securities available-for-sale [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] | Securities available-for-sale [Member] | Asset backed securities [Member] | Commercial mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	96		126
Net Balance, Assets	96		126
Estimate of fair value [Member] | Securities available-for-sale [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	220		227
Net Balance, Assets	220		227
Estimate of fair value [Member] | Securities available-for-sale [Member] | Asset backed securities [Member] | Others [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	94		94
Net Balance, Assets	94		94
Estimate of fair value [Member] | Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross Balance, Assets	753	[4]	58	[4]
Net Balance, Assets	753	[4]	58	[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	205	[5]	227	[5]
Net Balance, Assets	$ 205	[5]	$ 227	[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 $3,988 million and $5,991 million and trading derivative liabilities of $4,989 million and $6,741 million as of March 31, 2014 and December 31, 2013, 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 certain commercial loans held for sale which we have elected to apply the fair value option. See Note 6, "Loans Held for Sale," for further information.

[5] See Note 7, "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.