Fair Value Measurements - Changes in Fair Value of Level 3 Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Assets, Beginning Balance	$ 3,690		$ 4,157
Fair Value Assets, Trading Revenue (Loss)	58	[1]	(330)	[1]
Fair Value Assets, Other Revenue	42	[1]	(77)	[1]
Fair Value Assets, Purchases	1,029		884
Fair Value Assets, Issuances	0		18
Fair Value Assets, Settlements	(1,548)		(1,022)
Transfers Into Level 3	(45)		25
Fair Value Assets, Transfers Out of Level 3	(76)		35
Fair Value Assets, Ending Balance	3,150		3,690
Fair Value Assets, Current Period Unrealized Gains (Losses)	(44)		(770)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Liability, Beginning Balance	(3,065)		(2,953)
Fair Value Liability, Trading Revenue (Loss)	23	[1]	(136)	[1]
Fair Value Liability, Purchases	0		0
Fair Value Liability, Issuances	(1,207)		(1,230)
Fair Value Liability, Settlements	616		384
Transfers into level 3	343		41
Fair Value Liability, Transfers Out of Level 3	742		911
Fair Value Liability, Ending Balance	(3,234)		(3,065)
Fair Value Liability, Current Period Unrealized Gains (Losses)	(207)		(92)
Interest rate contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Assets, Beginning Balance	7	[2]	9	[2]
Fair Value Assets, Trading Revenue (Loss)	0	[1],[2]	0	[1],[2]
Fair Value Assets, Other Revenue	(6)	[1],[2]	(2)	[1],[2]
Fair Value Assets, Purchases	0	[2]	0	[2]
Fair Value Assets, Issuances	0	[2]	0	[2]
Fair Value Assets, Settlements	0	[2]	0	[2]
Transfers Into Level 3	0	[2]	0	[2]
Fair Value Assets, Transfers Out of Level 3	0	[2]	0	[2]
Fair Value Assets, Ending Balance	1	[2]	7	[2]
Fair Value Assets, Current Period Unrealized Gains (Losses)	(7)	[2]	(2)	[2]
Foreign exchange contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Assets, Beginning Balance	5	[2]	(1)	[2]
Fair Value Assets, Trading Revenue (Loss)	1	[1],[2]	(34)	[1],[2]
Fair Value Assets, Other Revenue	0	[1],[2]	0	[1],[2]
Fair Value Assets, Purchases	0	[2]	0	[2]
Fair Value Assets, Issuances	0	[2]	(6)	[2]
Fair Value Assets, Settlements	105	[2]	15	[2]
Transfers Into Level 3	(16)	[2]	(2)	[2]
Fair Value Assets, Transfers Out of Level 3	0	[2]	33	[2]
Fair Value Assets, Ending Balance	95	[2]	5	[2]
Fair Value Assets, Current Period Unrealized Gains (Losses)	100	[2]	5	[2]
Equity contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Assets, Beginning Balance	(7)	[2]	(83)	[2]
Fair Value Assets, Trading Revenue (Loss)	85	[1],[2]	116	[1],[2]
Fair Value Assets, Other Revenue	0	[1],[2]	0	[1],[2]
Fair Value Assets, Purchases	0	[2]	0	[2]
Fair Value Assets, Issuances	0	[2]	0	[2]
Fair Value Assets, Settlements	(67)	[2]	(41)	[2]
Transfers Into Level 3	16	[2]	(1)	[2]
Fair Value Assets, Transfers Out of Level 3	(24)	[2]	2	[2]
Fair Value Assets, Ending Balance	3	[2]	(7)	[2]
Fair Value Assets, Current Period Unrealized Gains (Losses)	9	[2]	45	[2]
Precious metals contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Assets, Beginning Balance	0	[2]	0	[2]
Fair Value Assets, Trading Revenue (Loss)	(2)	[1],[2]	0	[1],[2]
Fair Value Assets, Other Revenue	0	[1],[2]	0	[1],[2]
Fair Value Assets, Purchases	0	[2]	0	[2]
Fair Value Assets, Issuances	0	[2]	0	[2]
Fair Value Assets, Settlements	0	[2]	0	[2]
Transfers Into Level 3	0	[2]	0	[2]
Fair Value Assets, Transfers Out of Level 3	0	[2]	0	[2]
Fair Value Assets, Ending Balance	(2)	[2]	0	[2]
Fair Value Assets, Current Period Unrealized Gains (Losses)	(2)	[2]	0	[2]
Credit contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Assets, Beginning Balance	571	[2]	1,353	[2]
Fair Value Assets, Trading Revenue (Loss)	(215)	[1],[2]	(698)	[1],[2]
Fair Value Assets, Other Revenue	0	[1],[2]	0	[1],[2]
Fair Value Assets, Purchases	0	[2]	0	[2]
Fair Value Assets, Issuances	0	[2]	0	[2]
Fair Value Assets, Settlements	(119)	[2]	(72)	[2]
Transfers Into Level 3	(45)	[2]	(12)	[2]
Fair Value Assets, Transfers Out of Level 3	(1)	[2]	0	[2]
Fair Value Assets, Ending Balance	191		571	[2]
Fair Value Assets, Current Period Unrealized Gains (Losses)	(369)	[2]	(926)	[2]
Collateralized debt obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Assets, Beginning Balance	466		703
Fair Value Assets, Trading Revenue (Loss)	154	[1]	130	[1]
Fair Value Assets, Other Revenue	0	[1]	0	[1]
Fair Value Assets, Purchases	237		70
Fair Value Assets, Issuances	0		0
Fair Value Assets, Settlements	(603)		(477)
Transfers Into Level 3	0		40
Fair Value Assets, Transfers Out of Level 3	0		0
Fair Value Assets, Ending Balance	254		466
Fair Value Assets, Current Period Unrealized Gains (Losses)	151		51
Corporate and other domestic [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Assets, Beginning Balance	1,861		1,679
Fair Value Assets, Trading Revenue (Loss)	29	[1]	46	[1]
Fair Value Assets, Other Revenue	0	[1]	0	[1]
Fair Value Assets, Purchases	792		426
Fair Value Assets, Issuances	0		0
Fair Value Assets, Settlements	(422)		(290)
Transfers Into Level 3	0		0
Fair Value Assets, Transfers Out of Level 3	0		0
Fair Value Assets, Ending Balance	2,260		1,861
Fair Value Assets, Current Period Unrealized Gains (Losses)	29		27
Foreign debt securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Assets, Beginning Balance	299		253
Fair Value Assets, Trading Revenue (Loss)	(10)	[1]	46	[1]
Fair Value Assets, Other Revenue	0	[1]	0	[1]
Fair Value Assets, Purchases	0		0
Fair Value Assets, Issuances	0		0
Fair Value Assets, Settlements	(238)		0
Transfers Into Level 3	0		0
Fair Value Assets, Transfers Out of Level 3	(51)		0
Fair Value Assets, Ending Balance	0		299
Fair Value Assets, Current Period Unrealized Gains (Losses)	0		46
Government debt securities issued by foreign entities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Assets, Beginning Balance	311		0
Fair Value Assets, Trading Revenue (Loss)	21	[1]	65	[1]
Fair Value Assets, Other Revenue	0	[1]
Fair Value Assets, Purchases	0		388
Fair Value Assets, Issuances	0
Fair Value Assets, Settlements	(211)		(142)
Transfers Into Level 3	0
Fair Value Assets, Transfers Out of Level 3	0
Fair Value Assets, Ending Balance	121		311
Fair Value Assets, Current Period Unrealized Gains (Losses)	2		61
Equity securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Assets, Beginning Balance	9		13
Fair Value Assets, Trading Revenue (Loss)	(5)	[1]	(1)	[1]
Fair Value Assets, Other Revenue	0	[1]	0	[1]
Fair Value Assets, Purchases	0		0
Fair Value Assets, Issuances	0		0
Fair Value Assets, Settlements	(4)		(3)
Transfers Into Level 3	0		0
Fair Value Assets, Transfers Out of Level 3	0		0
Fair Value Assets, Ending Balance	0		9
Fair Value Assets, Current Period Unrealized Gains (Losses)	(5)		(1)
Loans Receivable [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Assets, Beginning Balance			11	[2],[3]
Fair Value Assets, Trading Revenue (Loss)			0	[1],[2]
Fair Value Assets, Other Revenue			1	[1],[2]
Fair Value Assets, Purchases			0	[2],[3]
Fair Value Assets, Issuances			0	[2],[3]
Fair Value Assets, Settlements			(12)	[2],[3]
Transfers Into Level 3			0	[2],[3]
Fair Value Assets, Transfers Out of Level 3			0	[2],[3]
Fair Value Assets, Ending Balance			0	[2],[3]
Fair Value Assets, Current Period Unrealized Gains (Losses)			0	[2],[3]
Mortgage servicing rights [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Assets, Beginning Balance	168	[2],[4]	220	[2],[4]
Fair Value Assets, Trading Revenue (Loss)	0	[1],[2],[4]	0	[1],[2],[4]
Fair Value Assets, Other Revenue	48	[1],[2],[4]	(76)	[1],[2],[4]
Fair Value Assets, Purchases	0	[2],[4]	0	[2],[4]
Fair Value Assets, Issuances	0	[2],[4]	24	[2],[4]
Fair Value Assets, Settlements	11	[2],[4]	0	[2],[4]
Transfers Into Level 3	0	[2],[4]	0	[2],[4]
Fair Value Assets, Transfers Out of Level 3	0	[2],[4]	0	[2],[4]
Fair Value Assets, Ending Balance	227	[2],[4]	168	[2],[4]
Fair Value Assets, Current Period Unrealized Gains (Losses)	48	[2],[4]	(76)	[2],[4]
Deposits In Domestic Office [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Liability, Beginning Balance	(2,636)		(2,867)
Fair Value Liability, Trading Revenue (Loss)	301	[1]	(123)	[1]
Fair Value Liability, Purchases	0		0
Fair Value Liability, Issuances	(601)		(806)
Fair Value Liability, Settlements	391		346
Transfers into level 3	305		34
Fair Value Liability, Transfers Out of Level 3	516		848
Fair Value Liability, Ending Balance	(2,334)		(2,636)
Fair Value Liability, Current Period Unrealized Gains (Losses)	(24)		(77)
Long-term Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Liability, Beginning Balance	(429)		(86)
Fair Value Liability, Trading Revenue (Loss)	(278)	[1]	(13)	[1]
Fair Value Liability, Purchases	0		0
Fair Value Liability, Issuances	(606)		(424)
Fair Value Liability, Settlements	225		38
Transfers into level 3	38		7
Fair Value Liability, Transfers Out of Level 3	226		63
Fair Value Liability, Ending Balance	(900)		(429)
Fair Value Liability, Current Period Unrealized Gains (Losses)	$ (183)		$ (15)

[1] Includes realized and unrealized gains and losses.

[2] Level 3 net derivatives included derivative assets of $805 million and derivative liabilities of $517 million as of December 31, 2013 and derivative assets of $1,365 million and derivative liabilities of $789 million as of December 31, 2012.

[3] Includes leveraged acquisition finance loans held for sale which we have elected to apply the fair value option. See Note 8, "Loans Held for Sale," for further information.

[4] See Note 10, "Intangible Assets," for additional information.