Long-term debt - Junior Subordinated Debt (Details 1) (USD $)			12 Months Ended																																		0 Months Ended	12 Months Ended
	Dec. 31, 2012 entities	Dec. 31, 2011	Dec. 31, 2012 Bank One Capital III [Member]	Dec. 31, 2011 Bank One Capital III [Member]	Dec. 31, 2012 Bank One Capital VI [Member]	Dec. 31, 2011 Bank One Capital VI [Member]	Dec. 31, 2012 Chase Capital II [Member]	Dec. 31, 2011 Chase Capital II [Member]	Dec. 31, 2012 Chase Capital III [Member]	Dec. 31, 2011 Chase Capital III [Member]	Dec. 31, 2012 Chase Capital VI [Member]	Dec. 31, 2011 Chase Capital VI [Member]	Dec. 31, 2012 First Chicago NBD Capital I [Member]	Dec. 31, 2011 First Chicago NBD Capital I [Member]	Dec. 31, 2012 J.P. Morgan Chase Capital X [Member]	Dec. 31, 2011 J.P. Morgan Chase Capital X [Member]	Dec. 31, 2012 JPMorgan Chase Capital XI [Member]	Dec. 31, 2011 JPMorgan Chase Capital XI [Member]	Dec. 31, 2012 JPMorgan Chase Capital XII [Member]	Dec. 31, 2011 JPMorgan Chase Capital XII [Member]	Dec. 31, 2012 JPMorgan Chase Capital XIII [Member]	Dec. 31, 2011 JPMorgan Chase Capital XIII [Member]	Dec. 31, 2012 JPMorgan Chase Capital XIV [Member]	Dec. 31, 2011 JPMorgan Chase Capital XIV [Member]	Dec. 31, 2012 JPMorgan Chase Capital XVI [Member]	Dec. 31, 2011 JPMorgan Chase Capital XVI [Member]	Dec. 31, 2012 JPMorgan Chase Capital XIX [Member]	Dec. 31, 2011 JPMorgan Chase Capital XIX [Member]	Dec. 31, 2012 JPMorgan Chase Capital XXI [Member]	Dec. 31, 2011 JPMorgan Chase Capital XXI [Member]	Dec. 31, 2012 JPMorgan Chase Capital XXIII [Member]	Dec. 31, 2011 JPMorgan Chase Capital XXIII [Member]	Dec. 31, 2012 JPMorgan Chase Capital XXIV [Member]	Dec. 31, 2011 JPMorgan Chase Capital XXIV [Member]	Dec. 31, 2012 JPMorgan Chase Capital XXIX [Member]	Dec. 31, 2011 JPMorgan Chase Capital XXIX [Member]	Jul. 12, 2012 Parent Company [Member]	Dec. 31, 2012 Parent Company [Member]
Debt Instrument [Line Items]
Payments for Repurchase of Trust Preferred Securities																																					$ 9,000,000,000
Preferred Stock, Liquidation Preference, Percentage																																					100.00%
Gains (Losses) on Extinguishment of Debt																																						888,000,000
Outstanding trust preferred debt security issuance
Issuer Trusts That Guarantee Capital Debt Securities, Number	17
Amount of trust preferred capital debt securities issued by trust	10,124,000,000		474,000,000		100,000,000		482,000,000		296,000,000		241,000,000		249,000,000		1,000,000,000		1,075,000,000		400,000,000		465,000,000		600,000,000		500,000,000		563,000,000		836,000,000		643,000,000		700,000,000		1,500,000,000
Principal amount of debenture issued to trust	$ 10,399,000,000	$ 20,900,000,000	$ 757,000,000		$ 105,000,000		$ 498,000,000		$ 305,000,000		$ 249,000,000		$ 256,000,000		$ 1,018,000,000		$ 1,013,000,000		$ 392,000,000		$ 480,000,000		$ 588,000,000		$ 494,000,000		$ 564,000,000		$ 837,000,000		$ 643,000,000		$ 700,000,000		$ 1,500,000,000			$ 10,200,000,000
Issue date			Dec. 31, 2000		Dec. 31, 2001		Dec. 31, 1997		Dec. 31, 1997		Dec. 31, 1998		Dec. 31, 1997		Dec. 31, 2002		Dec. 31, 2003		Dec. 31, 2003		Dec. 31, 2004		Dec. 31, 2004		Dec. 31, 2005		Dec. 31, 2006		Dec. 31, 2007		Dec. 31, 2007		Dec. 31, 2007		Dec. 31, 2010
Stated maturity of trust preferred capital securities and debentures			2030		2031		2027		2027		2028		2027		2032		2033		2033		2034		2034		2035		2036		2037		2047		2047		2040
Earliest redemption date			Any time		Any time		Any time		Any time		Any time		Any time		Any time		Any time		Any time		2014		Any time		Any time		Any time		Any time		Any time		Any time		2015
Debt Instrument, Interest Rate Terms			Fixed Rate 8.75%		Fixed Rate 7.20%		LIBOR + 0.50%		LIBOR + 0.55%		LIBOR + 0.625%		LIBOR + 0.55%		Fixed Rate 7.00%		Fixed Rate 5.88%		Fixed Rate 6.25%		LIBOR + 0.95%		Fixed Rate 6.20%		Fixed Rate 6.35%		Fixed Rate 6.63%		LIBOR + 0.95%		LIBOR + 1.00%		Fixed Rate 6.88%		Fixed Rate 6.70%
Interest rate of trust preferred capital securities and debentures			8.75%		7.20%										7.00%		5.88%		6.25%				6.20%		6.35%		6.63%						6.88%		6.70%
Interest rate spread of trust preferred capital securities and debentures							0.50%		0.55%		0.63%		0.55%								0.95%								0.95%		1.00%
Interest payment/distribution dates				Semiannually		Quarterly		Quarterly		Quarterly		Quarterly		Quarterly		Quarterly		Quarterly		Quarterly		Quarterly		Quarterly		Quarterly		Quarterly		Quarterly		Quarterly		Quarterly		Quarterly