Off-balance Sheet Lending-related Financial Instruments, Guarantees, and Other Commitments - Securities Lending Indemnifications (Details)	12 Months Ended
Dec. 31, 2018
Standby letters of credit and other financial guarantees
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Percentage exceeding value of securities for obtaining cash or other highly liquid 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