Noninterest Revenue (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended																									3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Debit Valuation Adjustment [Member]	Dec. 31, 2011 Debit Valuation Adjustment [Member]	Dec. 31, 2010 Debit Valuation Adjustment [Member]	Dec. 31, 2012 Commodity	Dec. 31, 2011 Commodity	Dec. 31, 2010 Commodity	Dec. 31, 2012 Interest rate	Dec. 31, 2011 Interest rate	Dec. 31, 2010 Interest rate	Dec. 31, 2012 Credit	Dec. 31, 2011 Credit	Dec. 31, 2010 Credit	Dec. 31, 2012 Foreign exchange	Dec. 31, 2011 Foreign exchange	Dec. 31, 2010 Foreign exchange	Dec. 31, 2012 Equity	Dec. 31, 2011 Equity	Dec. 31, 2010 Equity	Dec. 31, 2012 Commodity	Dec. 31, 2011 Commodity	Dec. 31, 2010 Commodity	Dec. 31, 2012 Federal Reserve Bank of New York [Member]	Sep. 30, 2012 Chief Investment Office [Member] Credit	Jun. 30, 2012 Chief Investment Office [Member] Credit	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Maximum [Member]
Schedule of Non interest Revenue [Line Items]
Credit Card Revenue Sharing Agreements General Period Length in Years																												3 years	10 years
Gain on Expected Recovery of Subordinated Loan, Pre-tax																									$ 665
Operating Leases, Income Statement, Lease Revenue	1,300	1,200	971
Underwriting:
Equity	1,026	1,181	1,589
Debt	3,290	2,934	3,172
Total underwriting	4,316	4,115	4,761
Advisory	1,492	1,796	1,429
Total investment banking fees	5,808	5,911	6,190
Principal transactions revenue
Trading revenue	4,765	8,898	9,404							3,922	(873)	(199)	(5,460)	3,393	4,543	1,436	1,154	1,896	2,504	2,401	2,275	2,363	2,823	889		449	5,800
Private equity gains/(losses)	771	1,107	1,490
Principal transactions	5,536	10,005	10,894	(930)	1,400	509
Gain (Loss) on Fair Value Hedges Recognized in Earnings	(860)	1,392	799				(1,399)	(1,096)	528
Asset management:
Investment management fees	6,309	6,085	5,632
All other asset management fees	792	605	496
Total asset management fees	7,101	6,690	6,128
Total administration fees	2,135	2,171	2,023
Commission and other fees:
Brokerage commissions	2,331	2,753	2,804
All other commissions and fees	2,301	2,480	2,544
Total commissions and fees	4,632	5,233	5,348
Total asset management, administration and commissions	$ 13,868	$ 14,094	$ 13,499