Variable Interest Entities - Multi-seller conduits (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Unfunded lending-related commitments	$ 1,266,530	$ 1,165,688
Multi-seller conduits
Variable Interest Entity [Line Items]
Commercial paper eliminated in consolidation	12,500	13,500
Multi-seller conduits \| Commercial and other
Variable Interest Entity [Line Items]
Unfunded lending-related commitments	$ 12,500	$ 12,200

The contractual amount of off-balance sheet lending-related financial instruments (e.g., commitments and guarantees), which represents the maximum possible credit risk should the counterparty draw upon the commitment or the entity be required to fulfill its obligation under the guarantee, and the counterparty subsequently fail to perform according to the terms of the contract.

No definition available.

Name:	jpm_OffBalanceSheetLendingRelatedFinancialCommitmentsContractualAmount
Namespace Prefix:	jpm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant