Fair Value Measurement - Impact of Credit Adjustments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Credit and funding adjustments:
Derivatives CVA	$ (337)	$ 241	$ 193
Derivatives FVA	$ (64)	$ 199	$ (74)

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