Business segments (Details) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2015 USD ($)		Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) segment		Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	[1]
Segment Reporting Information [Line Items]
Number of reportable segments | segment				4
Noninterest revenue	$ 11,856		$ 13,362	$ 38,373		$ 39,790
Net interest income	10,924		11,107	32,285		32,572
Total net revenue	22,780		24,469	70,658		72,362
Provision for credit losses	682		757	2,576		2,299
Noninterest expense	15,368		15,798	44,751		45,865
Income before income tax expense/(benefit)	6,730		7,914	23,331		24,198
Income tax expense/(benefit)	(74)		2,349	4,323		7,384
Net income	6,804		5,565	19,008		16,814
Average common equity	217,023		209,621	214,389		205,888
Total assets	$ 2,417,121	[1]	$ 2,526,655	$ 2,417,121	[1]	$ 2,526,655	$ 2,572,773
Return on common equity	12.00%		10.00%	11.00%		10.00%
Overhead ratio	67.00%		65.00%	63.00%		63.00%
Operating Segments | Consumer & Community Banking
Segment Reporting Information [Line Items]
Noninterest revenue	$ 3,729		$ 4,214	$ 11,554		$ 12,116
Net interest income	7,150		7,153	21,044		21,303
Total net revenue	10,879		11,367	32,598		33,419
Provision for credit losses	389		902	2,021		2,570
Noninterest expense	6,237		6,305	18,637		19,198
Income before income tax expense/(benefit)	4,253		4,160	11,940		11,651
Income tax expense/(benefit)	1,623		1,631	4,558		4,645
Net income	2,630		2,529	7,382		7,006
Average common equity	51,000		51,000	51,000		51,000
Total assets	$ 484,253		$ 448,033	$ 484,253		$ 448,033
Return on common equity	20.00%		19.00%	18.00%		18.00%
Overhead ratio	57.00%		55.00%	57.00%		57.00%
Operating Segments | Corporate & Investment Bank
Segment Reporting Information [Line Items]
Noninterest revenue	$ 5,748		$ 6,129	$ 19,055		$ 18,874
Net interest income	2,420		2,976	7,418		8,338
Total net revenue	8,168		9,105	26,473		27,212
Provision for credit losses	232		(67)	251		(102)
Noninterest expense	6,131		6,035	16,925		17,697
Income before income tax expense/(benefit)	1,805		3,137	9,297		9,617
Income tax expense/(benefit)	341		1,457	2,955		3,681
Net income	1,464		1,680	6,342		5,936
Average common equity	62,000		61,000	62,000		61,000
Total assets	$ 801,133		$ 873,971	$ 801,133		$ 873,971
Return on common equity	8.00%		10.00%	13.00%		12.00%
Overhead ratio	75.00%		66.00%	64.00%		65.00%
Operating Segments | Commercial Banking
Segment Reporting Information [Line Items]
Noninterest revenue	$ 522		$ 571	$ 1,767		$ 1,706
Net interest income	1,122		1,132	3,358		3,406
Total net revenue	1,644		1,703	5,125		5,112
Provision for credit losses	82		(79)	325		(141)
Noninterest expense	719		668	2,131		2,029
Income before income tax expense/(benefit)	843		1,114	2,669		3,224
Income tax expense/(benefit)	325		443	1,028		1,282
Net income	518		671	1,641		1,942
Average common equity	14,000		14,000	14,000		14,000
Total assets	$ 201,157		$ 191,563	$ 201,157		$ 191,563
Return on common equity	14.00%		18.00%	15.00%		18.00%
Overhead ratio	44.00%		39.00%	42.00%		40.00%
Operating Segments | Asset Management
Segment Reporting Information [Line Items]
Noninterest revenue	$ 2,261		$ 2,422	$ 7,189		$ 7,020
Net interest income	633		624	1,885		1,808
Total net revenue	2,894		3,046	9,074		8,828
Provision for credit losses	(17)		9	(13)		1
Noninterest expense	2,109		2,081	6,690		6,218
Income before income tax expense/(benefit)	802		956	2,397		2,609
Income tax expense/(benefit)	327		366	969		996
Net income	475		590	1,428		1,613
Average common equity	9,000		9,000	9,000		9,000
Total assets	$ 131,412		$ 130,296	$ 131,412		$ 130,296
Return on common equity	20.00%		25.00%	20.00%		23.00%
Overhead ratio	73.00%		68.00%	74.00%		70.00%
Operating Segments | Corporate
Segment Reporting Information [Line Items]
Noninterest revenue	$ 73		$ 450	$ 213		$ 1,325
Net interest income	(123)		(525)	(597)		(1,560)
Total net revenue	(50)		(75)	(384)		(235)
Provision for credit losses	(4)		(8)	(8)		(29)
Noninterest expense	172		709	368		723
Income before income tax expense/(benefit)	(218)		(776)	(744)		(929)
Income tax expense/(benefit)	(1,935)		(871)	(2,959)		(1,246)
Net income	1,717		95	2,215		317
Average common equity	81,023		74,621	78,389		70,888
Total assets	799,166		882,792	799,166		882,792
Reconciling Items
Segment Reporting Information [Line Items]
Noninterest revenue	(477)		(424)	(1,405)		(1,251)
Net interest income	(278)		(253)	(823)		(723)
Total net revenue	(755)		(677)	(2,228)		(1,974)
Provision for credit losses	0		0	0		0
Noninterest expense	0		0	0		0
Income before income tax expense/(benefit)	(755)		(677)	(2,228)		(1,974)
Income tax expense/(benefit)	(755)		(677)	(2,228)		(1,974)
Net income	0		0	0		0
Average common equity	$ 0		$ 0	$ 0		$ 0

[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.