Off-balance Sheet Lending-related Financial Instruments, Guarantees, and Other Commitments - Securities Lending Indemnifications (Details)	12 Months Ended
Dec. 31, 2020
Off-Balance Sheet Lending-Related Financial Instruments, Guarantees and Other Commitments [Abstract]
Percentage exceeding value of securities for obtaining cash or other highly liquid collateral	100.00%
Percentage exceeding value of resale agreements for obtaining collateral	100.00%

The percentage of cash or other highly liquid collateral obtained by the Firm as part of an indemnification agreement relative to the value of securities on loan from the borrower as part of a securities lending program.

No definition available.

Name:	jpm_PercentageOfCashOrLiquidCollateralRelativeToValueOfSecuritiesOnLoan
Namespace Prefix:	jpm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration