Securities - Transfer from AFS to HTM (Details) (USD $)	Mar. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Fair value of securities transferred from available-for-sale to held-to-maturity	$ 19,300,000,000
Net pretax unrealized gains (losses) in AOCI on securities on date of transfer from available-for-sale to held-to-maturity	$ (9,000,000)

Net Pretax Unrealized Gains (Losses) in Accumulated Other Comprehensive Income on Securities on the Date of Transfer from Available-For-Sale to Held-to-Maturity.

No definition available.

Name:	jpm_NetPretaxUnrealizedGainsLossesinAccumulatedOtherComprehensiveIncomeonSecuritiesontheDateofTransferfromAvailableForSaletoHeldtoMaturity
Namespace Prefix:	jpm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant