Variable interest entities - Resecuritizations, Multi-seller conduits (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2015		Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014	Dec. 31, 2014
Variable Interest Entity [Line Items]
Securities transferred to agency resecuritization VIEs	$ 6,600		$ 7,500	$ 16,800		$ 20,800
Securities transferred to private-label re-securitization VIEs	50		237	777		670
Total assets (including notional amount of interest-only securities)	2,417,121	[1]	2,526,655	2,417,121	[1]	2,526,655	$ 2,572,773	[1]
Unfunded lending-related commitments	940,786		$ 1,057,204	940,786		$ 1,057,204	950,997
Nonconsolidated rirm-sponsored private-label re-securitizations
Variable Interest Entity [Line Items]
Total assets (including notional amount of interest-only securities)	2,200			2,200			2,900
Re-securitization | Private-label re-securitizations
Variable Interest Entity [Line Items]
Senior and subordinated interest in nonconsolidated agency re-securitization entities	2			2			36
Re-securitization | Private-label re-securitizations | Residential mortgage
Variable Interest Entity [Line Items]
VIE, consolidated, carrying amount assets	48			48			77
VIE, consolidated, carrying amount liabilities	9			9			21
Re-securitization | Re-securitizations
Variable Interest Entity [Line Items]
Senior and subordinated interest in nonconsolidated agency re-securitization entities	1,800			1,800			2,400
Multi-seller conduits
Variable Interest Entity [Line Items]
Commercial paper eliminated in consolidation	6,100			6,100			5,700
Multi-seller conduits | Commercial and other
Variable Interest Entity [Line Items]
Unfunded lending-related commitments	$ 6,900			$ 6,900			$ 9,900

[1] The following table presents information on assets and liabilities related to VIEs that are consolidated by the Firm at September 30, 2015, and December 31, 2014. The difference between total VIE assets and liabilities represents the Firm’s interests in those entities, which were eliminated in consolidation.(in millions)Sep 30, 2015 Dec 31, 2014Assets Trading assets$4,237 $9,090Loans69,119 68,880All other assets2,109 1,815Total assets$75,465 $79,785Liabilities Beneficial interests issued by consolidated variable interest entities$48,733 $52,362All other liabilities821 949Total liabilities$49,554 $53,311The assets of the consolidated VIEs are used to settle the liabilities of those entities. The holders of the beneficial interests do not have recourse to the general credit of JPMorgan Chase. At both September 30, 2015, and December 31, 2014, the Firm provided limited program-wide credit enhancement of $2.0 billion related to its Firm-administered multi-seller conduits, which are eliminated in consolidation. For further discussion, see Note 15.