Derivatives, Balance Sheet Offsetting of Assets and Liabilities (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2015	Dec. 31, 2014
Derivative Assets
Gross amounts recognized	$ 83,895	$ 88,474
Gross amounts offset in consolidated balance sheet	(65,486)	(65,869)
Net amounts in consolidated balance sheet	18,409	22,605
Gross amounts not offset in consolidated balance sheet	(1,300)	(1,332)
Net amounts	17,109	21,273
Derivative Liabilities
Gross amounts recognized	81,075	83,781
Gross amounts offset in consolidated balance sheet	(66,379)	(65,043)
Net amounts in consolidated balance sheet	14,696	18,738
Gross amounts not offset in consolidated balance sheet	(4,093)	(5,248)
Net amounts	10,603	13,490
Interest rate contract [Member]
Derivative Assets
Gross amounts recognized	61,698	63,698
Gross amounts offset in consolidated balance sheet	(55,749)	(56,051)
Net amounts in consolidated balance sheet	5,949	7,647
Gross amounts not offset in consolidated balance sheet	(808)	(769)
Net amounts	$ 5,141	$ 6,878
Percent exchanged in the over the counter market	39.00%	45.00%
Derivative Liabilities
Gross amounts recognized	$ 58,647	$ 60,059
Gross amounts offset in consolidated balance sheet	(53,848)	(54,394)
Net amounts in consolidated balance sheet	4,799	5,665
Gross amounts not offset in consolidated balance sheet	(3,335)	(4,244)
Net amounts	$ 1,464	$ 1,421
Percent traded in over the counter market	34.00%	44.00%
Commodity contract [Member]
Derivative Assets
Gross amounts recognized	$ 4,642	$ 7,461
Gross amounts offset in consolidated balance sheet	(959)	(1,233)
Net amounts in consolidated balance sheet	3,683	6,228
Gross amounts not offset in consolidated balance sheet	(1)	(72)
Net amounts	$ 3,682	$ 6,156
Percent exchanged in the over the counter market	35.00%	27.00%
Derivative Liabilities
Gross amounts recognized	$ 5,223	$ 7,702
Gross amounts offset in consolidated balance sheet	(1,141)	(1,459)
Net amounts in consolidated balance sheet	4,082	6,243
Gross amounts not offset in consolidated balance sheet	(149)	(33)
Net amounts	$ 3,933	$ 6,210
Percent traded in over the counter market	87.00%	81.00%
Equity contract [Member]
Derivative Assets
Gross amounts recognized	$ 9,117	$ 9,005
Gross amounts offset in consolidated balance sheet	(3,187)	(2,842)
Net amounts in consolidated balance sheet	5,930	6,163
Gross amounts not offset in consolidated balance sheet	(481)	(405)
Net amounts	$ 5,449	$ 5,758
Percent exchanged in the over the counter market	52.00%	54.00%
Derivative Liabilities
Gross amounts recognized	$ 6,328	$ 7,038
Gross amounts offset in consolidated balance sheet	(2,842)	(2,845)
Net amounts in consolidated balance sheet	3,486	4,193
Gross amounts not offset in consolidated balance sheet	(243)	(484)
Net amounts	$ 3,243	$ 3,709
Percent traded in over the counter market	83.00%	82.00%
Foreign exchange contract [Member]
Derivative Assets
Gross amounts recognized	$ 7,695	$ 7,404
Gross amounts offset in consolidated balance sheet	(4,940)	(4,923)
Net amounts in consolidated balance sheet	2,755	2,481
Gross amounts not offset in consolidated balance sheet	(9)	(85)
Net amounts	$ 2,746	$ 2,396
Percent exchanged in the over the counter market	99.00%	98.00%
Derivative Liabilities
Gross amounts recognized	$ 9,971	$ 7,827
Gross amounts offset in consolidated balance sheet	(7,871)	(5,511)
Net amounts in consolidated balance sheet	2,100	2,316
Gross amounts not offset in consolidated balance sheet	(276)	(270)
Net amounts	$ 1,824	$ 2,046
Percent traded in over the counter market	100.00%	100.00%
Credit Contracts Protection Sold [Member]
Derivative Assets
Gross amounts recognized	$ 101	$ 151
Gross amounts offset in consolidated balance sheet	(92)	(131)
Net amounts in consolidated balance sheet	9	20
Gross amounts not offset in consolidated balance sheet	0	0
Net amounts	$ 9	$ 20
Percent exchanged in the over the counter market	93.00%	90.00%
Derivative Liabilities
Gross amounts recognized	$ 743	$ 943
Gross amounts offset in consolidated balance sheet	(606)	(713)
Net amounts in consolidated balance sheet	137	230
Gross amounts not offset in consolidated balance sheet	(54)	(199)
Net amounts	$ 83	$ 31
Percent traded in over the counter market	100.00%	100.00%
Credit Contracts Protection Purchased [Member]
Derivative Assets
Gross amounts recognized	$ 642	$ 755
Gross amounts offset in consolidated balance sheet	(559)	(689)
Net amounts in consolidated balance sheet	83	66
Gross amounts not offset in consolidated balance sheet	(1)	(1)
Net amounts	$ 82	$ 65
Percent exchanged in the over the counter market	100.00%	100.00%
Derivative Liabilities
Gross amounts recognized	$ 125	$ 168
Gross amounts offset in consolidated balance sheet	(71)	(121)
Net amounts in consolidated balance sheet	54	47
Gross amounts not offset in consolidated balance sheet	(36)	(18)
Net amounts	$ 18	$ 29
Percent traded in over the counter market	74.00%	86.00%
Other contract [Member]
Derivative Liabilities
Gross amounts recognized	$ 38	$ 44
Gross amounts offset in consolidated balance sheet	0	0
Net amounts in consolidated balance sheet	38	44
Gross amounts not offset in consolidated balance sheet	0	0
Net amounts	$ 38	$ 44
Percent traded in over the counter market	100.00%	100.00%

Fair value of securities received as collateral against derivative assets.

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