Noninterest Revenue (Details) (USD $)	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended			3 Months Ended		6 Months Ended			1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2013 Interest rate	Jun. 30, 2012 Interest rate	Jun. 30, 2013 Interest rate	Jun. 30, 2012 Interest rate	Jun. 30, 2013 Credit	Jun. 30, 2012 Credit	Jun. 30, 2013 Credit	Jun. 30, 2012 Credit	Jun. 30, 2013 Foreign exchange	Jun. 30, 2012 Foreign exchange	Jun. 30, 2013 Foreign exchange	Jun. 30, 2012 Foreign exchange	Jun. 30, 2013 Equity	Jun. 30, 2012 Equity	Jun. 30, 2013 Equity	Jun. 30, 2012 Equity	Jun. 30, 2013 Commodity	Jun. 30, 2012 Commodity	Jun. 30, 2013 Commodity	Jun. 30, 2012 Commodity	Jun. 30, 2013 Debit Valuation Adjustment	Jun. 30, 2012 Debit Valuation Adjustment	Jun. 30, 2013 Debit Valuation Adjustment	Jun. 30, 2012 Debit Valuation Adjustment	Jun. 30, 2012 Chief Investment Office Credit	Jun. 30, 2012 Chief Investment Office Credit	Jun. 30, 2013 Credit derivatives	Dec. 31, 2012 Credit derivatives	Jun. 30, 2013 Commodity	Jun. 30, 2012 Commodity	Jun. 30, 2013 Commodity	Jun. 30, 2012 Commodity	Dec. 31, 2012 Commodity	Jun. 30, 2012 Synthetic Credit Derivatives Credit derivatives Chief Investment Office	Jul. 02, 2012 Synthetic Credit Derivatives Credit derivatives Chief Investment Office
Underwriting:
Equity	$ 457,000,000	$ 250,000,000	$ 730,000,000	$ 526,000,000
Debt	956,000,000	654,000,000	1,873,000,000	1,477,000,000
Total underwriting	1,413,000,000	904,000,000	2,603,000,000	2,003,000,000
Advisory	304,000,000	353,000,000	559,000,000	635,000,000
Total investment banking fees	1,717,000,000	1,257,000,000	3,162,000,000	2,638,000,000
Principal transactions revenue
Trading revenue	3,280,000,000	(781,000,000)	7,313,000,000	1,578,000,000		564,000,000	1,228,000,000	1,153,000,000	2,573,000,000	733,000,000	(3,583,000,000)	1,878,000,000	(4,567,000,000)	554,000,000	245,000,000	1,043,000,000	793,000,000	888,000,000	712,000,000	2,010,000,000	1,535,000,000	541,000,000	617,000,000	1,229,000,000	1,244,000,000					4,400,000,000	5,800,000,000								240,000,000
Private equity gains/(losses)	480,000,000	354,000,000	208,000,000	717,000,000
Principal transactions	3,760,000,000	(427,000,000)	7,521,000,000	2,295,000,000																						355,000,000	755,000,000	481,000,000	(152,000,000)
Derivative notional amount	73,544,000,000,000		73,544,000,000,000		69,546,000,000,000																											6,291,000,000,000	5,981,000,000,000	850,000,000,000		850,000,000,000		1,024,000,000,000		12,000,000,000
Gain (Loss) on Fair Value Hedges Recognized in Earnings	353,000,000	312,000,000	756,000,000	(97,000,000)																														114,000,000	203,000,000	140,000,000	(279,000,000)
Asset management:
Investment management fees	1,948,000,000	1,607,000,000	3,773,000,000	3,152,000,000
All other asset management fees	139,000,000	68,000,000	263,000,000	131,000,000
Total asset management fees	2,087,000,000	1,675,000,000	4,036,000,000	3,283,000,000
Total administration fees	548,000,000	559,000,000	1,075,000,000	1,094,000,000
Commission and other fees:
Brokerage commissions	625,000,000	585,000,000	1,205,000,000	1,240,000,000
All other commissions and fees	605,000,000	642,000,000	1,148,000,000	1,236,000,000
Total commissions and fees	1,230,000,000	1,227,000,000	2,353,000,000	2,476,000,000
Total asset management, administration and commissions	3,865,000,000	3,461,000,000	7,464,000,000	6,853,000,000
Operating Leases, Income Statement, Lease Revenue	$ 363,000,000	$ 328,000,000	$ 712,000,000	$ 651,000,000