Business Changes and Developments (Details) (Common stock, USD $)	2 Months Ended	3 Months Ended	9 Months Ended	25 Months Ended
May 04, 2012	Mar. 13, 2012	Dec. 31, 2011	Mar. 18, 2011
Common stock
Changes in common stock dividend
Common Stock Quarterly Dividend Rate per Share	$ 0.30	$ 0.25	$ 0.25	$ 0.05

The declared common stock quarterly dividend rate, per share, over the context period.

No definition available.

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Namespace Prefix:	jpm_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration