Business Segments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2011	Dec. 31, 2012
Business and Segment Description [Abstract]
Number of JPMorgan Chase & Co business segments	4		4
Segment results and reconciliation
Noninterest Income	$ 14,507	$ 11,034	$ 28,696	$ 25,420
Interest Income (Expense), Net	10,704	11,146	21,637	22,812
Total net revenue	25,211	22,180	50,333	48,232
Provision for credit losses	47	214	664	940
Noninterest expense	15,866	14,966	31,289	33,311
Income before income tax expense	9,298	7,000	18,380	13,981
Income tax expense / (benefit)	2,802	2,040	5,355	4,097
Net income/(loss)	6,496	4,960	13,025	9,884
Average common equity	197,283	181,021	196,016	179,366
Total assets	2,439,494	2,290,146	2,439,494	2,290,146		2,359,141
Return on average common equity	13.00%	11.00%	13.00%	11.00%
Overhead ratio	63.00%	67.00%	62.00%	69.00%
Consumer & Community Banking
Segment results and reconciliation
Noninterest Income	4,921	5,289	9,327	10,275	5,289
Interest Income (Expense), Net	7,094	7,161	14,303	14,527	7,161
Total net revenue	12,015	12,450	23,630	24,802	12,450
Provision for credit losses	(19)	179	530	821	179
Noninterest expense	6,864	6,837	13,654	13,882	6,837
Income before income tax expense	5,170	5,434	9,446	10,099	5,434
Income tax expense / (benefit)	2,081	2,152	3,771	3,892	2,152
Net income/(loss)	3,089	3,282	5,675	6,207	3,282
Average common equity	46,000	43,000	46,000	43,000	43,000
Total assets	460,642	466,650	460,642	466,650		466,650
Return on average common equity	27.00%	31.00%	25.00%	29.00%	31.00%
Overhead ratio	57.00%	55.00%	58.00%	56.00%	55.00%
Corporate & Investment Bank
Segment results and reconciliation
Noninterest Income	7,171	6,261	14,528	12,749
Interest Income (Expense), Net	2,705	2,725	5,488	5,575
Total net revenue	9,876	8,986	20,016	18,324
Provision for credit losses	(6)	29	5	26
Noninterest expense	5,742	5,293	11,853	11,504
Income before income tax expense	4,140	3,664	8,158	6,794
Income tax expense / (benefit)	1,302	1,288	2,710	2,385
Net income/(loss)	2,838	2,376	5,448	4,409
Average common equity	56,500	47,500	56,500	47,500
Total assets	873,527	897,413	873,527	897,413
Return on average common equity	20.00%	20.00%	19.00%	19.00%
Overhead ratio	58.00%	59.00%	59.00%	63.00%
Commercial Banking
Segment results and reconciliation
Noninterest Income	551	562	1,086	1,119
Interest Income (Expense), Net	1,177	1,129	2,315	2,229
Total net revenue	1,728	1,691	3,401	3,348
Provision for credit losses	44	(17)	83	60
Noninterest expense	652	591	1,296	1,189
Income before income tax expense	1,032	1,117	2,022	2,099
Income tax expense / (benefit)	411	444	805	835
Net income/(loss)	621	673	1,217	1,264
Average common equity	13,500	9,500	13,500	9,500
Total assets	184,124	163,698	184,124	163,698
Return on average common equity	18.00%	28.00%	18.00%	27.00%
Overhead ratio	38.00%	35.00%	38.00%	36.00%
Asset Management
Segment results and reconciliation
Noninterest Income	2,156	1,852	4,250	3,739
Interest Income (Expense), Net	569	512	1,128	995
Total net revenue	2,725	2,364	5,378	4,734
Provision for credit losses	23	34	44	53
Noninterest expense	1,892	1,701	3,768	3,430
Income before income tax expense	810	629	1,566	1,251
Income tax expense / (benefit)	310	238	579	474
Net income/(loss)	500	391	987	777
Average common equity	9,000	7,000	9,000	7,000
Total assets	115,157	98,704	115,157	98,704
Return on average common equity	22.00%	22.00%	22.00%	22.00%
Overhead ratio	69.00%	72.00%	70.00%	72.00%
Corporate/Private Equity
Segment results and reconciliation
Noninterest Income	290	(2,413)	651	(1,411)
Interest Income (Expense), Net	(676)	(186)	(1,270)	(148)
Total net revenue	(386)	(2,599)	(619)	(1,559)
Provision for credit losses	5	(11)	2	(20)
Noninterest expense	716	544	718	3,306
Income before income tax expense	(1,107)	(3,132)	(1,339)	(4,845)
Income tax expense / (benefit)	(555)	(1,370)	(1,037)	(2,072)
Net income/(loss)	(552)	(1,762)	(302)	(2,773)
Average common equity	72,283	74,021	71,016	72,366
Total assets	806,044	663,681	806,044	663,681
Reconciling Items
Segment results and reconciliation
Noninterest Income	(582)	(517)	(1,146)	(1,051)
Interest Income (Expense), Net	(165)	(195)	(327)	(366)
Total net revenue	(747)	(712)	(1,473)	(1,417)
Provision for credit losses	0	0	0
Noninterest expense	0	0	0
Income before income tax expense	(747)	(712)	(1,473)	(1,417)
Income tax expense / (benefit)	(747)	(712)	(1,473)	(1,417)
Net income/(loss)	0	0	0	0
Average common equity	$ 0	$ 0	$ 0	$ 0