Fair Value Measurement - Impact of Credit Adjustments (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Credit and funding adjustments:
Derivatives CVA	$ 60	$ 84
Derivatives FVA	$ 152	$ (83)

For debit valuation adjustments ("DVA") and funding valuation adjustments ("FVA"), amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

No definition available.

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