Derivative Instruments - Derivatives Netting (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	$ 1,332,176,000,000	$ 1,635,280,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(1,275,561,000,000)	(1,589,298,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	56,615,000,000	45,982,000,000
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	17,136,000,000	29,001,000,000
Derivative Asset, Fair Value, Gross Asset	1,349,312,000,000	1,664,281,000,000
Derivative Assets	73,751,000,000	74,983,000,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	64,600,000,000	79,200,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	1,319,857,000,000	1,620,093,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(1,267,734,000,000)	(1,570,803,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	52,123,000,000	49,290,000,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	12,262,000,000	21,366,000,000
Derivative Liability, Fair Value, Gross Liability	1,332,119,000,000	1,641,459,000,000
Derivative Liabilities	64,385,000,000	70,656,000,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	56,800,000,000	60,700,000,000
Interest rate contract
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	963,753,000,000	1,286,464,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(939,515,000,000)	(1,263,362,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	24,238,000,000	23,102,000,000
Derivative Asset, Fair Value, Gross Asset	971,212,000,000	1,302,567,000,000
Derivative Assets	31,697,000,000	39,205,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	936,225,000,000	1,256,787,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(919,769,000,000)	(1,235,813,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	16,456,000,000	20,974,000,000
Derivative Liability, Fair Value, Gross Liability	938,185,000,000	1,260,719,000,000
Derivative Liabilities	18,416,000,000	24,906,000,000
Interest rate contract | Over the counter
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	592,762,000,000	794,517,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(568,551,000,000)	(771,684,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	24,211,000,000	22,833,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	576,955,000,000	774,769,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(560,519,000,000)	(754,050,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	16,436,000,000	20,719,000,000
Interest rate contract | OTC-cleared
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	370,991,000,000	491,947,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(370,964,000,000)	(491,678,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	27,000,000	269,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	359,270,000,000	482,018,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(359,250,000,000)	(481,763,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	20,000,000	255,000,000
Interest rate contract | Exchange-traded
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	0	0
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	0	0
Derivatives Assets, Subject to Master Netting Arrangement	0	0
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	0	0
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	0	0
Derivatives Liabilities, Subject to Master Netting Arrangement	0	0
Credit Risk Contract
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	93,165,000,000	99,215,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(91,297,000,000)	(98,575,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	1,868,000,000	640,000,000
Derivative Asset, Fair Value, Gross Asset	93,661,000,000	100,310,000,000
Derivative Assets	2,364,000,000	1,735,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	90,691,000,000	98,542,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(89,032,000,000)	(97,523,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	1,659,000,000	1,019,000,000
Derivative Liability, Fair Value, Gross Liability	91,643,000,000	100,027,000,000
Derivative Liabilities	2,611,000,000	2,504,000,000
Credit Risk Contract | Over the counter
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	82,980,000,000	90,744,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(81,113,000,000)	(90,104,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	1,867,000,000	640,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	80,148,000,000	89,170,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(78,490,000,000)	(88,151,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	1,658,000,000	1,019,000,000
Credit Risk Contract | OTC-cleared
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	10,185,000,000	8,471,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(10,184,000,000)	(8,471,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	1,000,000	0
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	10,543,000,000	9,372,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(10,542,000,000)	(9,372,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	1,000,000	0
Foreign exchange contract
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	171,791,000,000	168,763,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(162,940,000,000)	(160,798,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	8,851,000,000	7,965,000,000
Derivative Asset, Fair Value, Gross Asset	177,257,000,000	174,940,000,000
Derivative Assets	14,317,000,000	14,142,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	188,469,000,000	181,195,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(176,350,000,000)	(169,936,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	12,119,000,000	11,259,000,000
Derivative Liability, Fair Value, Gross Liability	193,060,000,000	188,537,000,000
Derivative Liabilities	16,710,000,000	18,601,000,000
Foreign exchange contract | Over the counter
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	171,703,000,000	168,740,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(162,852,000,000)	(160,775,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	8,851,000,000	7,965,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	188,344,000,000	181,166,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(176,231,000,000)	(169,913,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	12,113,000,000	11,253,000,000
Foreign exchange contract | OTC-cleared
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	88,000,000	23,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(88,000,000)	(23,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	0	0
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	125,000,000	29,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(119,000,000)	(23,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	6,000,000	6,000,000
Foreign exchange contract | Exchange-traded
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	0	0
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	0	0
Derivatives Assets, Subject to Master Netting Arrangement	0	0
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	0	0
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	0	0
Derivatives Liabilities, Subject to Master Netting Arrangement	0	0
Equity Contract
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	50,321,000,000	38,849,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(38,490,000,000)	(33,396,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	11,831,000,000	5,453,000,000
Derivative Asset, Fair Value, Gross Asset	52,059,000,000	42,662,000,000
Derivative Assets	13,569,000,000	9,266,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	50,515,000,000	40,320,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(38,676,000,000)	(32,715,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	11,839,000,000	7,605,000,000
Derivative Liability, Fair Value, Gross Liability	53,404,000,000	44,534,000,000
Derivative Liabilities	14,728,000,000	11,819,000,000
Equity Contract | Over the counter
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	31,838,000,000	26,008,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(28,006,000,000)	(24,628,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	3,832,000,000	1,380,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	33,123,000,000	28,320,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(28,192,000,000)	(23,948,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	4,931,000,000	4,372,000,000
Equity Contract | OTC-cleared
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	0	0
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	0	0
Derivatives Assets, Subject to Master Netting Arrangement	0	0
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	0	0
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	0	0
Derivatives Liabilities, Subject to Master Netting Arrangement	0	0
Equity Contract | Exchange-traded
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	18,483,000,000	12,841,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(10,484,000,000)	(8,768,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	7,999,000,000	4,073,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	17,392,000,000	12,000,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(10,484,000,000)	(8,767,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	6,908,000,000	3,233,000,000
Commodity Contract
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	53,146,000,000	41,989,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(43,319,000,000)	(33,167,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	9,827,000,000	8,822,000,000
Derivative Asset, Fair Value, Gross Asset	55,123,000,000	43,802,000,000
Derivative Assets	11,804,000,000	10,635,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	53,957,000,000	43,249,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(43,907,000,000)	(34,816,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	10,050,000,000	8,433,000,000
Derivative Liability, Fair Value, Gross Liability	55,827,000,000	47,642,000,000
Derivative Liabilities	11,920,000,000	12,826,000,000
Commodity Contract | Over the counter
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	27,765,000,000	26,881,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(19,514,000,000)	(20,760,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	8,251,000,000	6,121,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	28,616,000,000	28,761,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(20,102,000,000)	(22,409,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	8,514,000,000	6,352,000,000
Commodity Contract | OTC-cleared
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	0	0
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	0	0
Derivatives Assets, Subject to Master Netting Arrangement	0	0
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	0	0
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	0	0
Derivatives Liabilities, Subject to Master Netting Arrangement	0	0
Commodity Contract | Exchange-traded
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	25,381,000,000	15,108,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(23,805,000,000)	(12,407,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	1,576,000,000	2,701,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	25,341,000,000	14,488,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(23,805,000,000)	(12,407,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	$ 1,536,000,000	$ 2,081,000,000