Derivatives and Hedging Activities (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	$ 638,513	$ 651,312
Total financial liabilities at fair value	377,677	388,669
Financial instruments owned, at fair value (includes $67,177 and $53,989 pledged as collateral as of December 2012 and December 2011, respectively)	407,011	364,206
Financial instruments sold, but not yet purchased, at fair value	126,644	145,013
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	190,737	136,780
Total financial liabilities at fair value	65,994	75,557
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	502,293	587,416
Total financial liabilities at fair value	318,764	319,160
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	47,095	47,937
Total financial liabilities at fair value	25,679	25,498
Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	608,356	646,170
Total financial liabilities at fair value	545,671	582,621
Interest Rate Contract [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	13	33
Total financial liabilities at fair value	14	24
Interest Rate Contract [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	608,151	645,923
Total financial liabilities at fair value	545,110	582,012
Interest Rate Contract [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	192	214
Total financial liabilities at fair value	547	585
Credit Risk Contract [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	85,816	150,816
Total financial liabilities at fair value	74,927	130,659
Credit Risk Contract [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	0	0
Total financial liabilities at fair value	0	0
Credit Risk Contract [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	74,907	137,110
Total financial liabilities at fair value	70,246	123,253
Credit Risk Contract [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	10,909	13,706
Total financial liabilities at fair value	4,681	7,406
Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	72,149	88,778
Total financial liabilities at fair value	60,894	71,757
Foreign Exchange Contract [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	0	0
Total financial liabilities at fair value	0	0
Foreign Exchange Contract [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	71,157	86,752
Total financial liabilities at fair value	59,937	70,573
Foreign Exchange Contract [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	992	2,026
Total financial liabilities at fair value	957	1,184
Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	23,320	35,966
Total financial liabilities at fair value	24,350	38,050
Commodity Contract [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	0	0
Total financial liabilities at fair value	0	0
Commodity Contract [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	22,697	35,062
Total financial liabilities at fair value	23,423	36,541
Commodity Contract [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	623	904
Total financial liabilities at fair value	927	1,509
Equity Contract [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	49,483	64,135
Total financial liabilities at fair value	43,681	51,928
Equity Contract [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	43	24
Total financial liabilities at fair value	50	185
Equity Contract [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	48,698	62,684
Total financial liabilities at fair value	41,641	49,884
Equity Contract [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	742	1,427
Total financial liabilities at fair value	1,990	1,859
Gross Fair Value of Derivative [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	839,124	985,865
Total financial liabilities at fair value	749,523	875,015
Gross Fair Value of Derivative [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	56	57
Total financial liabilities at fair value	64	209
Gross Fair Value of Derivative [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	825,610	967,531
Total financial liabilities at fair value	740,357	862,263
Gross Fair Value of Derivative [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	13,458	18,277
Total financial liabilities at fair value	9,102	12,543
Derivative Net Of Counterparty Netting [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	170,664	198,132
Total financial liabilities at fair value	81,063	87,282
Derivative Net Of Counterparty Netting [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	56	57
Total financial liabilities at fair value	64	209
Derivative Net Of Counterparty Netting [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	162,812	188,892
Total financial liabilities at fair value	77,559	83,624
Derivative Net Of Counterparty Netting [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	9,920	11,900
Total financial liabilities at fair value	5,564	6,166
Cross-Level Netting [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	(2,124)	(2,717)
Total financial liabilities at fair value	(2,124)	(2,717)
Cash collateral netting [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	(99,488)	(118,104)
Total financial liabilities at fair value	(30,636)	(28,829)
Counterparty Netting [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	(668,460)	(787,733)
Total financial liabilities at fair value	(668,460)	(787,733)
Counterparty Netting [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	0	0
Total financial liabilities at fair value	0	0
Counterparty Netting [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	(662,798)	(778,639)
Total financial liabilities at fair value	(662,798)	(778,639)
Counterparty Netting [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on A Recurring Basis
Total financial assets at fair value	(3,538)	(6,377)
Total financial liabilities at fair value	$ (3,538)	$ (6,377)