Derivative Instruments and Hedging Activities (Components of Derivative Products) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Derivative Assets
Gross amounts	$ 540,819	$ 676,371
Amounts offset in the Condensed Consolidated Statements of Financial Condition	(507,525)	(639,977)
Net amounts presented in the Condensed Consolidated Statements of Financial Condition	33,294	36,394
Amounts not offset against financial instruments collateral	(9,967)	(9,844)
Amounts not offset against other cash collateral	(8)	(19)
Net exposure	23,319	26,531
Derivative assets, which are either not subject to master netting agreements or collateral agreements, or are subject to such agreements but the entity has not determined the agreements to be legally enforceable	6,200	6,500
Derivative Liabilities
Gross amounts	523,862	654,306
Amounts offset in the Condensed Consolidated Statements of Financial Condition	(488,089)	(614,094)
Net amounts presented in the Condensed Consolidated Statements of Financial Condition	35,773	40,212
Amounts not offset against financial instruments collateral	(7,702)	(11,918)
Amounts not offset against other cash collateral	(2)	(185)
Net exposure	28,069	28,109
Derivative liabilities, which are either not subject to master netting agreements or collateral agreements, or are subject to such agreements but the entity has not determined the agreements to be legally enforceable	6,900	6,900
Bilateral OTC
Derivative Assets
Gross amounts	379,609	427,079
Amounts offset in the Condensed Consolidated Statements of Financial Condition	(351,265)	(396,582)
Net amounts presented in the Condensed Consolidated Statements of Financial Condition	28,344	30,497
Amounts not offset against financial instruments collateral	(9,967)	(9,844)
Amounts not offset against other cash collateral	(8)	(19)
Net exposure	18,369	20,634
Derivative Liabilities
Gross amounts	361,467	410,003
Amounts offset in the Condensed Consolidated Statements of Financial Condition	(332,549)	(375,095)
Net amounts presented in the Condensed Consolidated Statements of Financial Condition	28,918	34,908
Amounts not offset against financial instruments collateral	(6,967)	(11,192)
Amounts not offset against other cash collateral	0	(179)
Net exposure	21,951	23,537
Cleared OTC
Derivative Assets
Gross amounts	129,262	217,169
Amounts offset in the Condensed Consolidated Statements of Financial Condition	(127,987)	(215,576)
Net amounts presented in the Condensed Consolidated Statements of Financial Condition	1,275	1,593
Amounts not offset against financial instruments collateral	0	0
Amounts not offset against other cash collateral	0	0
Net exposure	1,275	1,593
Derivative Liabilities
Gross amounts	128,153	211,695
Amounts offset in the Condensed Consolidated Statements of Financial Condition	(127,267)	(211,180)
Net amounts presented in the Condensed Consolidated Statements of Financial Condition	886	515
Amounts not offset against financial instruments collateral	0	0
Amounts not offset against other cash collateral	(2)	(6)
Net exposure	884	509
Exchange Traded
Derivative Assets
Gross amounts	31,948	32,123
Amounts offset in the Condensed Consolidated Statements of Financial Condition	(28,273)	(27,819)
Net amounts presented in the Condensed Consolidated Statements of Financial Condition	3,675	4,304
Amounts not offset against financial instruments collateral	0	0
Amounts not offset against other cash collateral	0	0
Net exposure	3,675	4,304
Derivative Liabilities
Gross amounts	34,242	32,608
Amounts offset in the Condensed Consolidated Statements of Financial Condition	(28,273)	(27,819)
Net amounts presented in the Condensed Consolidated Statements of Financial Condition	5,969	4,789
Amounts not offset against financial instruments collateral	(735)	(726)
Amounts not offset against other cash collateral	0	0
Net exposure	$ 5,234	$ 4,063