Fair Value Measurements - Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Netting, Assets	$ (72,092)	[1],[2]	$ (63,913)	[1],[2]
Netting Liabilities	(72,092)	[1],[2]	(63,913)	[1],[2]
Trading assets	22,444		21,092
Trading liabilities	11,288		8,164
Obligations of U.S. states and political subdivision [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets	586		591
Other securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets	18		22
Precious metals [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets	3,310		1,992
Trading liabilities	0		22
Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading liabilities	10,642		7,459
Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets	6,506		5,602
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	28,140		24,828
Gross Balance, Liabilities	613		727
Level 1 [Member] | Trading liabilities excluding derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	477		653
Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	136	[3]	74	[3]
Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest rate contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	58	[3]	43	[3]
Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Foreign exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	47	[3]	13	[3]
Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	0	[3]	0	[3]
Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Precious metals contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	31	[3]	18	[3]
Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	0	[3]	0	[3]
Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Derivatives netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	0	[3]	0	[3]
Level 1 [Member] | Trading Securities, excluding derivatives [Member] | U.S. Treasury, U.S. Government agencies and sponsored entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	2,912		2,675
Level 1 [Member] | Trading Securities, excluding derivatives [Member] | Obligations of U.S. states and political subdivision [Member]
Fair Value, Assets and Liabilities Measured on Recurring 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 Basis [Line Items]
Gross Balance, Assets	0		0
Level 1 [Member] | Trading Securities, excluding derivatives [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 1 [Member] | Trading Securities, excluding derivatives [Member] | Student Loan Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 1 [Member] | Trading Securities, excluding derivatives [Member] | Corporate and other domestic [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 1 [Member] | Trading Securities, excluding derivatives [Member] | Corporate debt securities issued by foreign entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 1 [Member] | Trading Securities, excluding derivatives [Member] | Government debt securities issued by foreign entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring 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 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 Basis [Line Items]
Gross Balance, Assets	0		0
Level 1 [Member] | Derivative financial assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	87	[3]	105	[3]
Level 1 [Member] | Derivative financial assets [Member] | Interest rate contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	32	[3]	46	[3]
Level 1 [Member] | Derivative financial assets [Member] | Foreign exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	22	[3]	0	[3]
Level 1 [Member] | Derivative financial assets [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0	[3]	0	[3]
Level 1 [Member] | Derivative financial assets [Member] | Precious metals contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	33	[3]	59	[3]
Level 1 [Member] | Derivative financial assets [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0	[3]	0	[3]
Level 1 [Member] | Derivative financial assets [Member] | Derivatives netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0	[3]	0	[3]
Level 1 [Member] | Securities available-for-sale [Member] | U.S. Treasury, U.S. Government agencies and sponsored entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	25,141		22,048
Level 1 [Member] | Securities available-for-sale [Member] | Obligations of U.S. states and political subdivision [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 1 [Member] | Securities available-for-sale [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 1 [Member] | Securities available-for-sale [Member] | Home Equity Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 1 [Member] | Securities available-for-sale [Member] | Other securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 1 [Member] | Securities available-for-sale [Member] | Corporate debt securities issued by foreign entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 1 [Member] | Securities available-for-sale [Member] | Government debt securities issued by foreign entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 1 [Member] | Securities available-for-sale [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	104,653		93,575
Gross Balance, Liabilities	98,260		87,302
Level 2 [Member] | Trading liabilities excluding derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	169		52
Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	84,678	[3]	73,728	[3]
Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest rate contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	52,183	[3]	46,683	[3]
Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Foreign exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	26,315	[3]	20,847	[3]
Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	1,603	[3]	1,661	[3]
Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Precious metals contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	645	[3]	596	[3]
Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	3,932	[3]	3,941	[3]
Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Derivatives netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	0	[3]	0	[3]
Level 2 [Member] | Trading Securities, excluding derivatives [Member] | U.S. Treasury, U.S. Government agencies and sponsored entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	107		48
Level 2 [Member] | Trading Securities, excluding derivatives [Member] | Obligations of U.S. states and political subdivision [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	586		591
Level 2 [Member] | Trading Securities, excluding derivatives [Member] | Collateralized debt obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 2 [Member] | Trading Securities, excluding derivatives [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	139		142
Level 2 [Member] | Trading Securities, excluding derivatives [Member] | Student Loan Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	88		86
Level 2 [Member] | Trading Securities, excluding derivatives [Member] | Corporate and other domestic [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		1
Level 2 [Member] | Trading Securities, excluding derivatives [Member] | Corporate debt securities issued by foreign entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	183		184
Level 2 [Member] | Trading Securities, excluding derivatives [Member] | Government debt securities issued by foreign entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	5,494		6,656
Level 2 [Member] | Trading Securities, excluding derivatives [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	18		22
Level 2 [Member] | Trading Securities, excluding derivatives [Member] | Precious metals [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	3,310		1,992
Level 2 [Member] | Derivative financial assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	86,518	[3]	75,377	[3]
Level 2 [Member] | Derivative financial assets [Member] | Interest rate contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	51,719	[3]	46,012	[3]
Level 2 [Member] | Derivative financial assets [Member] | Foreign exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	27,735	[3]	22,241	[3]
Level 2 [Member] | Derivative financial assets [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	2,245	[3]	2,212	[3]
Level 2 [Member] | Derivative financial assets [Member] | Precious metals contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	794	[3]	1,013	[3]
Level 2 [Member] | Derivative financial assets [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	4,025	[3]	3,899	[3]
Level 2 [Member] | Derivative financial assets [Member] | Derivatives netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0	[3]	0	[3]
Level 2 [Member] | Securities available-for-sale [Member] | U.S. Treasury, U.S. Government agencies and sponsored entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	2,721		3,117
Level 2 [Member] | Securities available-for-sale [Member] | Obligations of U.S. states and political subdivision [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	748		667
Level 2 [Member] | Securities available-for-sale [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	29		43
Level 2 [Member] | Securities available-for-sale [Member] | Home Equity Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	85		89
Level 2 [Member] | Securities available-for-sale [Member] | Other securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	94		94
Level 2 [Member] | Securities available-for-sale [Member] | Corporate debt securities issued by foreign entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	360		517
Level 2 [Member] | Securities available-for-sale [Member] | Government debt securities issued by foreign entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	3,753		3,398
Level 2 [Member] | Securities available-for-sale [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	165		167
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	3,705		3,752
Gross Balance, Liabilities	2,776		2,863
Level 3 [Member] | Collateralized debt obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	254		253
Level 3 [Member] | Corporate and other domestic [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	2,848		2,840
Level 3 [Member] | Interest rate contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	20		0
Level 3 [Member] | Foreign exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0	[4]	0	[4]
Level 3 [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	43	[4]	42
Level 3 [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	192		210
Level 3 [Member] | Trading liabilities excluding derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	0		0
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	208	[3]	248	[3]
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest rate contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	1	[3]	1	[3]
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Foreign exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	19	[3]	23	[3]
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	122	[3]	138	[3]
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Precious metals contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	0	[3]	0	[3]
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	66	[3]	86	[3]
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Derivatives netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	0	[3]	0	[3]
Level 3 [Member] | Trading Securities, excluding derivatives [Member] | U.S. Treasury, U.S. Government agencies and sponsored entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 3 [Member] | Trading Securities, excluding derivatives [Member] | Obligations of U.S. states and political subdivision [Member]
Fair Value, Assets and Liabilities Measured on Recurring 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 Basis [Line Items]
Gross Balance, Assets	253		253
Level 3 [Member] | Trading Securities, excluding derivatives [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 3 [Member] | Trading Securities, excluding derivatives [Member] | Student Loan Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 3 [Member] | Trading Securities, excluding derivatives [Member] | Corporate and other domestic [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	2,848		2,840
Level 3 [Member] | Trading Securities, excluding derivatives [Member] | Corporate debt securities issued by foreign entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 3 [Member] | Trading Securities, excluding derivatives [Member] | Government debt securities issued by foreign entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 3 [Member] | Trading Securities, excluding derivatives [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring 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 Basis [Line Items]
Gross Balance, Assets	0		0
Level 3 [Member] | Derivative financial assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	463	[3]	500	[3]
Level 3 [Member] | Derivative financial assets [Member] | Interest rate contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	21	[3]	1	[3]
Level 3 [Member] | Derivative financial assets [Member] | Foreign exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	19	[3]	23	[3]
Level 3 [Member] | Derivative financial assets [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	165	[3]	180	[3]
Level 3 [Member] | Derivative financial assets [Member] | Precious metals contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0	[3]	0	[3]
Level 3 [Member] | Derivative financial assets [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	258	[3]	296	[3]
Level 3 [Member] | Derivative financial assets [Member] | Derivatives netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0	[3]	0	[3]
Level 3 [Member] | Securities available-for-sale [Member] | U.S. Treasury, U.S. Government agencies and sponsored entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 3 [Member] | Securities available-for-sale [Member] | Obligations of U.S. states and political subdivision [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 3 [Member] | Securities available-for-sale [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 3 [Member] | Securities available-for-sale [Member] | Home Equity Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 3 [Member] | Securities available-for-sale [Member] | Other securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 3 [Member] | Securities available-for-sale [Member] | Corporate debt securities issued by foreign entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 3 [Member] | Securities available-for-sale [Member] | Government debt securities issued by foreign entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Level 3 [Member] | Securities available-for-sale [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0		0
Estimate of fair value [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	136,498		122,155
Netting, Assets	(78,665)	[5]	(68,724)	[5]
Net Balance, Assets	57,833		53,431
Gross Balance, Liabilities	101,649		90,892
Netting Liabilities	(73,176)	[5]	(65,637)	[5]
Net Balance, Liabilities	28,473		25,255
Estimate of fair value [Member] | Trading liabilities excluding derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	646		705
Net Balance, Liabilities	646		705
Estimate of fair value [Member] | Derivative Financial Instruments, Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	85,022	[3]	74,050	[3]
Netting Liabilities	(73,176)	[3],[5]	(65,637)	[3],[5]
Net Balance, Liabilities	11,846	[3]	8,413	[3]
Estimate of fair value [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest rate contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	52,242	[3]	46,727	[3]
Netting Liabilities	0	[3],[5]	0	[3],[5]
Net Balance, Liabilities	52,242	[3]	46,727	[3]
Estimate of fair value [Member] | Derivative Financial Instruments, Liabilities [Member] | Foreign exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	26,381	[3]	20,883	[3]
Netting Liabilities	0	[3],[5]	0	[3],[5]
Net Balance, Liabilities	26,381	[3]	20,883	[3]
Estimate of fair value [Member] | Derivative Financial Instruments, Liabilities [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	1,725	[3]	1,799	[3]
Netting Liabilities	0	[3],[5]	0	[3],[5]
Net Balance, Liabilities	1,725	[3]	1,799	[3]
Estimate of fair value [Member] | Derivative Financial Instruments, Liabilities [Member] | Precious metals contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	676	[3]	614	[3]
Netting Liabilities	0	[3],[5]	0	[3],[5]
Net Balance, Liabilities	676	[3]	614	[3]
Estimate of fair value [Member] | Derivative Financial Instruments, Liabilities [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	3,998	[3]	4,027	[3]
Netting Liabilities	0	[3],[5]	0	[3],[5]
Net Balance, Liabilities	3,998	[3]	4,027	[3]
Estimate of fair value [Member] | Derivative Financial Instruments, Liabilities [Member] | Derivatives netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	0	[3]	0	[3]
Netting Liabilities	(73,176)	[3],[5]	(65,637)	[3],[5]
Net Balance, Liabilities	(73,176)	[3]	(65,637)	[3]
Estimate of fair value [Member] | Trading Securities, excluding derivatives [Member] | U.S. Treasury, U.S. Government agencies and sponsored entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	3,019		2,723
Net Balance, Assets	3,019		2,723
Estimate of fair value [Member] | Trading Securities, excluding derivatives [Member] | Obligations of U.S. states and political subdivision [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	586		591
Net Balance, Assets	586		591
Estimate of fair value [Member] | Trading Securities, excluding derivatives [Member] | Collateralized debt obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	253		253
Net Balance, Assets	253		253
Estimate of fair value [Member] | Trading Securities, excluding derivatives [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	139		142
Net Balance, Assets	139		142
Estimate of fair value [Member] | Trading Securities, excluding derivatives [Member] | Student Loan Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	88		86
Net Balance, Assets	88		86
Estimate of fair value [Member] | Trading Securities, excluding derivatives [Member] | Corporate and other domestic [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	2,848		2,841
Net Balance, Assets	2,848		2,841
Estimate of fair value [Member] | Trading Securities, excluding derivatives [Member] | Corporate debt securities issued by foreign entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	183		184
Net Balance, Assets	183		184
Estimate of fair value [Member] | Trading Securities, excluding derivatives [Member] | Government debt securities issued by foreign entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	5,494		6,656
Net Balance, Assets	5,494		6,656
Estimate of fair value [Member] | Trading Securities, excluding derivatives [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	18		22
Net Balance, Assets	18		22
Estimate of fair value [Member] | Trading Securities, excluding derivatives [Member] | Precious metals [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	3,310		1,992
Net Balance, Assets	3,310		1,992
Estimate of fair value [Member] | Derivative financial assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	87,068	[3]	75,982	[3]
Netting, Assets	(78,665)	[3],[5]	(68,724)	[3],[5]
Net Balance, Assets	8,403	[3]	7,258	[3]
Estimate of fair value [Member] | Derivative financial assets [Member] | Interest rate contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	51,772	[3]	46,059	[3]
Netting, Assets	0	[3],[5]	0	[3],[5]
Net Balance, Assets	51,772	[3]	46,059	[3]
Estimate of fair value [Member] | Derivative financial assets [Member] | Foreign exchange contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	27,776	[3]	22,264	[3]
Netting, Assets	0	[3],[5]	0	[3],[5]
Net Balance, Assets	27,776	[3]	22,264	[3]
Estimate of fair value [Member] | Derivative financial assets [Member] | Equity contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	2,410	[3]	2,392	[3]
Netting, Assets	0	[3],[5]	0	[3],[5]
Net Balance, Assets	2,410	[3]	2,392	[3]
Estimate of fair value [Member] | Derivative financial assets [Member] | Precious metals contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	827	[3]	1,072	[3]
Netting, Assets	0	[3],[5]	0	[3],[5]
Net Balance, Assets	827	[3]	1,072	[3]
Estimate of fair value [Member] | Derivative financial assets [Member] | Credit contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	4,283	[3]	4,195	[3]
Netting, Assets	0	[3],[5]	0	[3],[5]
Net Balance, Assets	4,283	[3]	4,195	[3]
Estimate of fair value [Member] | Derivative financial assets [Member] | Derivatives netting [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0	[3]	0	[3]
Netting, Assets	(78,665)	[3],[5]	(68,724)	[3],[5]
Net Balance, Assets	(78,665)	[3]	(68,724)	[3]
Estimate of fair value [Member] | Securities available-for-sale [Member] | U.S. Treasury, U.S. Government agencies and sponsored entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	27,862		25,165
Net Balance, Assets	27,862		25,165
Estimate of fair value [Member] | Securities available-for-sale [Member] | Obligations of U.S. states and political subdivision [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	748		667
Net Balance, Assets	748		667
Estimate of fair value [Member] | Securities available-for-sale [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	29		43
Net Balance, Assets	29		43
Estimate of fair value [Member] | Securities available-for-sale [Member] | Home Equity Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	85		89
Net Balance, Assets	85		89
Estimate of fair value [Member] | Securities available-for-sale [Member] | Other securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	94		94
Net Balance, Assets	94		94
Estimate of fair value [Member] | Securities available-for-sale [Member] | Corporate debt securities issued by foreign entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	360		517
Net Balance, Assets	360		517
Estimate of fair value [Member] | Securities available-for-sale [Member] | Government debt securities issued by foreign entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	3,753		3,398
Net Balance, Assets	3,753		3,398
Estimate of fair value [Member] | Securities available-for-sale [Member] | Equity securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	165		167
Net Balance, Assets	165		167
Loans Receivable [Member] | Level 1 [Member] | Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0	[6]	0	[6]
Loans Receivable [Member] | Level 2 [Member] | Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	255	[6]	384	[6]
Loans Receivable [Member] | Level 3 [Member] | Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0	[6]	0	[6]
Loans Receivable [Member] | Estimate of fair value [Member] | Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	255	[6]	384	[6]
Net Balance, Assets	255	[6]	384	[6]
Deposits [Member] | Level 1 [Member] | Deposits In Domestic Offices [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	0	[7]	0	[7]
Deposits [Member] | Level 2 [Member] | Deposits In Domestic Offices [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	5,022	[7]	5,378	[7]
Deposits [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	1,926	[4],[8]	1,968	[4],[8]
Deposits [Member] | Level 3 [Member] | Deposits In Domestic Offices [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	1,926	[7]	1,968	[7]
Deposits [Member] | Estimate of fair value [Member] | Deposits In Domestic Offices [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	6,948	[7]	7,346	[7]
Net Balance, Liabilities	6,948	[7]	7,346	[7]
Long-term debt [Member] | Level 1 [Member] | Long-term Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	0		0
Long-term debt [Member] | Level 2 [Member] | Long-term Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	8,391		8,144
Long-term debt [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	642	[4],[8]	647	[4],[8]
Long-term debt [Member] | Level 3 [Member] | Long-term Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	642		647
Long-term debt [Member] | Estimate of fair value [Member] | Long-term Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities	9,033		8,791
Netting Liabilities	0	[5]
Net Balance, Liabilities	9,033		8,791
Mortgage servicing rights [Member] | Level 1 [Member] | Mortgage servicing rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0	[9]	0	[9]
Mortgage servicing rights [Member] | Level 2 [Member] | Mortgage servicing rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	0	[9]	0	[9]
Mortgage servicing rights [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	141		159
Mortgage servicing rights [Member] | Level 3 [Member] | Mortgage servicing rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	141	[9]	159	[9]
Mortgage servicing rights [Member] | Estimate of fair value [Member] | Mortgage servicing rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets	141	[9]	159	[9]
Net Balance, Assets	$ 141	[9]	$ 159	[9]

[1] Represents the netting of derivative receivable and payable balances for the same counterparty under enforceable netting agreements.

[2] Netting is performed at a counterparty level in cases where enforceable master netting and credit support agreements are in place, regardless of the type of derivative instrument. Therefore, we have not attempted to allocate netting to the different types of derivative instruments shown in the table above.

[3] Includes trading derivative assets of $6,506 million and $5,602 million and trading derivative liabilities of $10,642 million and $7,459 million as of March 31, 2015 and December 31, 2014, respectively, as well as derivatives held for hedging and commitments accounted for as derivatives.

[4] We are the client-facing entity and we enter into identical but opposite derivatives to transfer the resultant risks to our affiliates. With the exception of counterparty credit risks, we are market neutral. The corresponding intra-group derivatives are presented as equity derivatives and foreign exchange derivatives in the table.

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

[6] 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.

[7] See Note 10, "Fair Value Option," for additional information.

[8] Structured deposits and structured notes contain embedded derivative features whose fair value measurements contain significant Level 3 inputs.

[9] See Note 7, "Intangible Assets," for additional information.