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Pension and Other Postretirement Employee Benefit Plans - One Percentage Point Increase Effects (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Effect of a one-percentage-point change in the assumed health care cost trend rate on the Firms total service and interest cost and accumulated postretirement benefit obligation  
Effect on accumulated postretirement benefit obligation, 1-Percentage-point increase $ 9us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation
Effect on accumulated postretirement benefit obligation, 1-Percentage-point decrease (8)us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1
Pension and other postretirement employee benefit plans, U.S.  
Effect of a one-percentage-point change in the assumed health care cost trend rate on the Firms total service and interest cost and accumulated postretirement benefit obligation  
Projected Increase in US Defined Benefit Pension and OPEB Plan Expense Resulting From a 25 Basis Point Decline in Expected Long-Term Rate of Return on US Plan Assets 40jpm_ProjectedIncreaseInUsDefinedBenefitPensionAndOpebPlanExpenseResultingFrom25BasisPointDeclineInExpectedLongTermRateOfReturnOnUsPlanAssets
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Projected Increase in US Defined Benefit Pension and OPEB Plan Expense Resulting from a 25 Basis Point Decline in Discount Rate For US Plans 36jpm_ProjectedIncreaseInUsDefinedBenefitPensionAndOpebPlanExpenseResultingFrom25BasisPointDeclineInDiscountRateForUsPlans
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
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Projected Increase in US Defined Benefit Pension and OPEB Benefit Obligations Resulting from a 25-Basis Point Decline in the Discount Rate for the US Plans 333jpm_ProjectedIncreaseInUsDefinedBenefitPensionAndOpebBenefitObligationsResultingFrom25BasisPointDeclineInDiscountRateForUsPlans
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= jpm_UsPensionPlansAndOtherUsPostretirementEmployeeBenefitPlansMember
Projected Increase In US Defined Benefit Pension Benefit Obligations Resulting From A25 Basis Boint Increase In Interest Crediting Rate For US Defined Benefit Pension Plan 148jpm_ProjectedIncreaseInUsDefinedBenefitPensionBenefitObligationsResultingFrom25BasisBointIncreaseInInterestCreditingRateForUsDefinedBenefitPensionPlan
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
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U.S. defined benefit pension plans  
Effect of a one-percentage-point change in the assumed health care cost trend rate on the Firms total service and interest cost and accumulated postretirement benefit obligation  
Projected Increase in US Defined Benefit Pension Plan Expense Resulting From a 25 Basis Point Increase in the Interest Crediting Rate for the US Plans 36jpm_ProjectedIncreaseInUsDefinedBenefitPensionPlanExpenseResultingFrom25BasisPointIncreaseInInterestCreditingRateForUsPlans
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Non-U.S. pension and other postretirement employee benefit plans  
Effect of a one-percentage-point change in the assumed health care cost trend rate on the Firms total service and interest cost and accumulated postretirement benefit obligation  
Projected increase in non-U.S. defined benefit pension and OPEB plan expense resulting from a 25-basis point decline in the discount rate for the non-U.S. plans $ 19jpm_ProjectedIncreaseInNonUsDefinedBenefitPensionAndOpebPlanExpenseResultingFrom25BasisPointDeclineInDiscountRateForNonUsPlans
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= jpm_ForeignPensionPlansAndOtherForeignPostretirementBenefitPlansMember