Derivative Instruments - Impact on Statements of Income, Net Investment Hedges (Details) - Net Investment Hedging - Foreign exchange derivatives - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Gains/(losses) recorded in income and other comprehensive income/(loss)
Amounts recorded in income	$ 4	$ (50)	$ (7)	$ (112)
Amounts recorded in OCI	$ 1,204	$ (319)	$ 815	$ (828)

Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax

No definition available.

Name:	jpm_OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossbeforeReclassificationandTax
Namespace Prefix:	jpm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration