Derivative Instruments Derivative Instruments - Derivatives Netting (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	$ 1,507,168,000,000	$ 1,643,376,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(1,455,433,000,000)	(1,597,394,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	51,735,000,000	45,982,000,000
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	18,874,000,000	29,001,000,000
Derivative Asset, Fair Value, Gross Asset	1,526,042,000,000	1,672,377,000,000
Derivative Assets	70,609,000,000	74,983,000,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	72,500,000,000	79,200,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	1,489,301,000,000	1,628,189,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(1,443,818,000,000)	(1,578,899,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	45,483,000,000	49,290,000,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	16,506,000,000	21,366,000,000
Derivative Liability, Fair Value, Gross Liability	1,505,807,000,000	1,649,555,000,000
Derivative Liabilities	61,989,000,000	70,656,000,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	60,900,000,000	60,700,000,000
Interest Rate Contract
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	1,164,053,000,000	1,313,145,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(1,139,509,000,000)	(1,290,043,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	24,544,000,000	23,102,000,000
Derivative Asset, Fair Value, Gross Asset	1,173,789,000,000	1,329,248,000,000
Derivative Assets	34,280,000,000	39,205,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	1,131,924,000,000	1,283,682,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(1,116,085,000,000)	(1,262,708,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	15,839,000,000	20,974,000,000
Derivative Liability, Fair Value, Gross Liability	1,134,696,000,000	1,287,614,000,000
Derivative Liabilities	18,611,000,000	24,906,000,000
Interest Rate Contract | Over the counter
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	742,239,000,000	821,198,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(717,741,000,000)	(798,365,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	24,498,000,000	22,833,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	719,641,000,000	801,664,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(703,862,000,000)	(780,945,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	15,779,000,000	20,719,000,000
Interest Rate Contract | OTC-cleared
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	421,814,000,000	491,947,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(421,768,000,000)	(491,678,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	46,000,000	269,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	412,283,000,000	482,018,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(412,223,000,000)	(481,763,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	60,000,000	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	102,719,000,000	99,215,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(99,735,000,000)	(98,575,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	2,984,000,000	640,000,000
Derivative Asset, Fair Value, Gross Asset	103,399,000,000	100,310,000,000
Derivative Assets	3,664,000,000	1,735,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	99,596,000,000	98,542,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(98,216,000,000)	(97,523,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	1,380,000,000	1,019,000,000
Derivative Liability, Fair Value, Gross Liability	101,350,000,000	100,027,000,000
Derivative Liabilities	3,134,000,000	2,504,000,000
Credit Risk Contract | Over the counter
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	92,182,000,000	90,744,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(89,199,000,000)	(90,104,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	2,983,000,000	640,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	88,702,000,000	89,170,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(87,322,000,000)	(88,151,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	1,380,000,000	1,019,000,000
Credit Risk Contract | OTC-cleared
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	10,537,000,000	8,471,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(10,536,000,000)	(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	10,894,000,000	9,372,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(10,894,000,000)	(9,372,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	0	0
Foreign exchange contract
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	136,723,000,000	142,082,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(129,145,000,000)	(134,117,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	7,578,000,000	7,965,000,000
Derivative Asset, Fair Value, Gross Asset	141,491,000,000	148,259,000,000
Derivative Assets	12,346,000,000	14,142,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	151,918,000,000	154,300,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(141,608,000,000)	(143,041,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	10,310,000,000	11,259,000,000
Derivative Liability, Fair Value, Gross Liability	156,414,000,000	161,642,000,000
Derivative Liabilities	14,806,000,000	18,601,000,000
Foreign exchange contract | Over the counter
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	136,683,000,000	142,059,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(129,105,000,000)	(134,094,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	7,578,000,000	7,965,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	151,880,000,000	154,271,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(141,571,000,000)	(143,018,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	10,309,000,000	11,253,000,000
Foreign exchange contract | OTC-cleared
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	40,000,000	23,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(40,000,000)	(23,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	0	0
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	38,000,000	29,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(37,000,000)	(23,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	1,000,000	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	44,340,000,000	38,849,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(36,403,000,000)	(33,396,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	7,937,000,000	5,453,000,000
Derivative Asset, Fair Value, Gross Asset	46,438,000,000	42,662,000,000
Derivative Assets	10,035,000,000	9,266,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	44,996,000,000	40,320,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(35,361,000,000)	(32,715,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	9,635,000,000	7,605,000,000
Derivative Liability, Fair Value, Gross Liability	48,708,000,000	44,534,000,000
Derivative Liabilities	13,347,000,000	11,819,000,000
Equity Contract | Over the counter
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	28,741,000,000	26,008,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(27,009,000,000)	(24,628,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	1,732,000,000	1,380,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	30,628,000,000	28,320,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(25,967,000,000)	(23,948,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	4,661,000,000	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	15,599,000,000	12,841,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(9,394,000,000)	(8,768,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	6,205,000,000	4,073,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	14,368,000,000	12,000,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(9,394,000,000)	(8,767,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	4,974,000,000	3,233,000,000
Commodity Contract
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	59,333,000,000	50,085,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(50,641,000,000)	(41,263,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	8,692,000,000	8,822,000,000
Derivative Asset, Fair Value, Gross Asset	60,925,000,000	51,898,000,000
Derivative Assets	10,284,000,000	10,635,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	60,867,000,000	51,345,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(52,548,000,000)	(42,912,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	8,319,000,000	8,433,000,000
Derivative Liability, Fair Value, Gross Liability	64,639,000,000	55,738,000,000
Derivative Liabilities	12,091,000,000	12,826,000,000
Commodity Contract | Over the counter
Derivative
Derivative Asset, Fair Value, Gross Asset, Subject to Master Netting Arrangement	37,838,000,000	34,977,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(30,877,000,000)	(28,856,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	6,961,000,000	6,121,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	39,447,000,000	36,857,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(32,783,000,000)	(30,505,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	6,664,000,000	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	21,495,000,000	15,108,000,000
Derivative Asset, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(19,764,000,000)	(12,407,000,000)
Derivatives Assets, Subject to Master Netting Arrangement	1,731,000,000	2,701,000,000
Derivative Liability, Fair Value, Gross Liability, Subject to Master Netting Arrangement	21,420,000,000	14,488,000,000
Derivative Liability, Fair Value, Amount Offset Against Other Derivatives and/or Collateral	(19,765,000,000)	(12,407,000,000)
Derivatives Liabilities, Subject to Master Netting Arrangement	$ 1,655,000,000	$ 2,081,000,000