Derivatives and Hedging Activities (Details 6) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
OTC Derivatives [Abstract]
OTC Derivative Assets	$ 67,404	$ 74,148
Gross Fair Value of Derivative Asset Contracts	839,124	985,865
OTC Derivative Liabilities	47,490	55,281
Gross Fair Value of Derivative Liability Contracts	749,523	875,015
Netting Across Product Types [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	(13,724)	(15,131)
OTC Derivative Liabilities	(13,724)	(15,131)
Cross Maturity Netting [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	(17,973)	(22,562)
OTC Derivative Liabilities	(17,973)	(22,562)
Cash collateral netting [Member]
OTC Derivatives [Abstract]
Gross Fair Value of Derivative Asset Contracts	(99,488)	(118,104)
Gross Fair Value of Derivative Liability Contracts	(30,636)	(28,829)
0-12 Months [Member] | Netting Across Product Types [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	(2,811)	(3,071)
OTC Derivative Liabilities	(2,811)	(3,071)
1-5 Years [Member] | Netting Across Product Types [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	(5,831)	(6,033)
OTC Derivative Liabilities	(5,831)	(6,033)
5 Years or Greater [Member] | Netting Across Product Types [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	(5,082)	(6,027)
OTC Derivative Liabilities	(5,082)	(6,027)
Interest Rate Contract [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	119,212	125,605
OTC Derivative Liabilities	56,548	62,133
Interest Rate Contract [Member] | 0-12 Months [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	10,318	10,931
OTC Derivative Liabilities	6,266	5,787
Interest Rate Contract [Member] | 1-5 Years [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	28,445	32,194
OTC Derivative Liabilities	17,860	18,607
Interest Rate Contract [Member] | 5 Years or Greater [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	80,449	82,480
OTC Derivative Liabilities	32,422	37,739
Credit Risk Contract [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	22,404	32,209
OTC Derivative Liabilities	11,514	12,051
Credit Risk Contract [Member] | 0-12 Months [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	2,190	3,054
OTC Derivative Liabilities	809	1,200
Credit Risk Contract [Member] | 1-5 Years [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	12,244	15,468
OTC Derivative Liabilities	7,537	6,957
Credit Risk Contract [Member] | 5 Years or Greater [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	7,970	13,687
OTC Derivative Liabilities	3,168	3,894
Foreign Exchange Contract [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	30,523	38,868
OTC Derivative Liabilities	19,217	21,842
Foreign Exchange Contract [Member] | 0-12 Months [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	11,100	11,253
OTC Derivative Liabilities	8,586	9,826
Foreign Exchange Contract [Member] | 1-5 Years [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	8,379	11,592
OTC Derivative Liabilities	4,849	5,514
Foreign Exchange Contract [Member] | 5 Years or Greater [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	11,044	16,023
OTC Derivative Liabilities	5,782	6,502
Commodity Contract [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	8,006	11,364
OTC Derivative Liabilities	9,356	14,223
Commodity Contract [Member] | 0-12 Months [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	3,840	5,286
OTC Derivative Liabilities	3,970	6,322
Commodity Contract [Member] | 1-5 Years [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	3,862	5,931
OTC Derivative Liabilities	3,119	5,174
Commodity Contract [Member] | 5 Years or Greater [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	304	147
OTC Derivative Liabilities	2,267	2,727
Equity Contract [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	18,444	21,899
OTC Derivative Liabilities	13,188	11,554
Equity Contract [Member] | 0-12 Months [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	3,757	6,663
OTC Derivative Liabilities	3,775	3,290
Equity Contract [Member] | 1-5 Years [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	7,730	7,768
OTC Derivative Liabilities	5,476	4,018
Equity Contract [Member] | 5 Years or Greater [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	6,957	7,468
OTC Derivative Liabilities	3,937	4,246
Derivatives Net of Counterparty Netting within Tenor Categories [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	184,865	214,814
OTC Derivative Liabilities	96,099	106,672
Derivatives Net of Counterparty Netting within Tenor Categories [Member] | 0-12 Months [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	28,394	34,116
OTC Derivative Liabilities	20,595	23,354
Derivatives Net of Counterparty Netting within Tenor Categories [Member] | 1-5 Years [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	54,829	66,920
OTC Derivative Liabilities	33,010	34,237
Derivatives Net of Counterparty Netting within Tenor Categories [Member] | 5 Years or Greater [Member]
OTC Derivatives [Abstract]
OTC Derivative Assets	101,642	113,778
OTC Derivative Liabilities	$ 42,494	$ 49,081