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Variable Interest Entities - Municipal Bond Vehicle VIEs (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Firm's exposure to nonconsolidated municipal bond VIEs [Abstract]      
Assets $ 2,577,148,000,000us-gaap_Assets [1] $ 2,572,773,000,000us-gaap_Assets [1] $ 2,476,650,000,000us-gaap_Assets
Nonconsolidated municipal bond vehicles | Municipal bond vehicles      
Firm's exposure to nonconsolidated municipal bond VIEs [Abstract]      
Assets 11,500,000,000us-gaap_Assets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MunicipalBondsMember
/ dei_LegalEntityAxis
= jpm_NonconsolidatedMunicipalBondVehiclesMember		 11,500,000,000us-gaap_Assets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MunicipalBondsMember
/ dei_LegalEntityAxis
= jpm_NonconsolidatedMunicipalBondVehiclesMember		  
Liquidity facilities provided by Firm serving as liquidity provider 6,300,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MunicipalBondsMember
/ dei_LegalEntityAxis
= jpm_NonconsolidatedMunicipalBondVehiclesMember		 6,300,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MunicipalBondsMember
/ dei_LegalEntityAxis
= jpm_NonconsolidatedMunicipalBondVehiclesMember		  
Excess/ (deficit) 5,200,000,000jpm_ExcessDeficitOfAssetsOverAvailableLiquidity
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MunicipalBondsMember
/ dei_LegalEntityAxis
= jpm_NonconsolidatedMunicipalBondVehiclesMember		 5,200,000,000jpm_ExcessDeficitOfAssetsOverAvailableLiquidity
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MunicipalBondsMember
/ dei_LegalEntityAxis
= jpm_NonconsolidatedMunicipalBondVehiclesMember		  
Weighted average expected life of assets (years) 4 years 10 months 24 days 4 years 10 months 24 days  
Nonconsolidated municipal bond vehicles | Municipal bond vehicles | Investment Grade AAA to AAA-      
Firm's exposure to nonconsolidated municipal bond VIEs [Abstract]      
Assets 2,700,000,000us-gaap_Assets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MunicipalBondsMember
/ us-gaap_InternalCreditAssessmentAxis
= jpm_InternalCreditRatingInvestmentGradeOneMember
/ dei_LegalEntityAxis
= jpm_NonconsolidatedMunicipalBondVehiclesMember		 2,700,000,000us-gaap_Assets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MunicipalBondsMember
/ us-gaap_InternalCreditAssessmentAxis
= jpm_InternalCreditRatingInvestmentGradeOneMember
/ dei_LegalEntityAxis
= jpm_NonconsolidatedMunicipalBondVehiclesMember		  
Nonconsolidated municipal bond vehicles | Municipal bond vehicles | Investment Grade AAplus to AA-      
Firm's exposure to nonconsolidated municipal bond VIEs [Abstract]      
Assets 8,400,000,000us-gaap_Assets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MunicipalBondsMember
/ us-gaap_InternalCreditAssessmentAxis
= jpm_InternalCreditRatingInvestmentGradeTwoMember
/ dei_LegalEntityAxis
= jpm_NonconsolidatedMunicipalBondVehiclesMember		 8,400,000,000us-gaap_Assets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MunicipalBondsMember
/ us-gaap_InternalCreditAssessmentAxis
= jpm_InternalCreditRatingInvestmentGradeTwoMember
/ dei_LegalEntityAxis
= jpm_NonconsolidatedMunicipalBondVehiclesMember		  
Nonconsolidated municipal bond vehicles | Municipal bond vehicles | Investment Grade Aplus to A-      
Firm's exposure to nonconsolidated municipal bond VIEs [Abstract]      
Assets 400,000,000us-gaap_Assets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MunicipalBondsMember
/ us-gaap_InternalCreditAssessmentAxis
= jpm_InternalCreditRatingInvestmentGradeThreeMember
/ dei_LegalEntityAxis
= jpm_NonconsolidatedMunicipalBondVehiclesMember		 400,000,000us-gaap_Assets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MunicipalBondsMember
/ us-gaap_InternalCreditAssessmentAxis
= jpm_InternalCreditRatingInvestmentGradeThreeMember
/ dei_LegalEntityAxis
= jpm_NonconsolidatedMunicipalBondVehiclesMember		  
Nonconsolidated municipal bond vehicles | Municipal bond vehicles | Investment Grade BBBplus to BBB-      
Firm's exposure to nonconsolidated municipal bond VIEs [Abstract]      
Assets 0us-gaap_Assets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MunicipalBondsMember
/ us-gaap_InternalCreditAssessmentAxis
= jpm_InternalCreditRatingInvestmentGradeFourMember
/ dei_LegalEntityAxis
= jpm_NonconsolidatedMunicipalBondVehiclesMember		 0us-gaap_Assets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MunicipalBondsMember
/ us-gaap_InternalCreditAssessmentAxis
= jpm_InternalCreditRatingInvestmentGradeFourMember
/ dei_LegalEntityAxis
= jpm_NonconsolidatedMunicipalBondVehiclesMember		  
Nonconsolidated municipal bond vehicles | Municipal bond vehicles | Non Investment Grade BBplus and below      
Firm's exposure to nonconsolidated municipal bond VIEs [Abstract]      
Assets 0us-gaap_Assets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MunicipalBondsMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_ExternalCreditRatingNonInvestmentGradeMember
/ dei_LegalEntityAxis
= jpm_NonconsolidatedMunicipalBondVehiclesMember		 0us-gaap_Assets
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MunicipalBondsMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_ExternalCreditRatingNonInvestmentGradeMember
/ dei_LegalEntityAxis
= jpm_NonconsolidatedMunicipalBondVehiclesMember		  
Variable Interest Entity, Not Primary Beneficiary | Municipal bond vehicles      
Firm's exposure to nonconsolidated municipal bond VIEs [Abstract]      
Maximum exposure $ 6,300,000,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MunicipalBondsMember
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 $ 6,300,000,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MunicipalBondsMember
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		  
[1] The following table presents information on assets and liabilities related to VIEs that are consolidated by the Firm at March 31, 2015, and December 31, 2014. The difference between total VIE assets and liabilities represents the Firm’s interests in those entities, which were eliminated in consolidation.(in millions)Mar 31, 2015 Dec 31, 2014Assets Trading assets$7,703 $9,090Loans67,184 68,880All other assets2,350 1,815Total assets$77,237 $79,785Liabilities Beneficial interests issued by consolidated variable interest entities$51,091 $52,362All other liabilities911 949Total liabilities$52,002 $53,311The assets of the consolidated VIEs are used to settle the liabilities of those entities. The holders of the beneficial interests do not have recourse to the general credit of JPMorgan Chase. At March 31, 2015, and December 31, 2014, the Firm provided limited program-wide credit enhancement of $2.0 billion and $2.0 billion, respectively, related to its Firm-administered multi-seller conduits, which are eliminated in consolidation. For further discussion, see Note 15.