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Income Taxes - Components of Income Tax Expense/(Benefit) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current income tax expense      
U.S. federal $ 1,610,000,000us-gaap_CurrentFederalTaxExpenseBenefit $ (1,316,000,000)us-gaap_CurrentFederalTaxExpenseBenefit $ 3,225,000,000us-gaap_CurrentFederalTaxExpenseBenefit
Non-U.S. 1,353,000,000us-gaap_CurrentForeignTaxExpenseBenefit 1,308,000,000us-gaap_CurrentForeignTaxExpenseBenefit 1,782,000,000us-gaap_CurrentForeignTaxExpenseBenefit
U.S. state and local 857,000,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit (4,000,000)us-gaap_CurrentStateAndLocalTaxExpenseBenefit 1,496,000,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current income tax expense/(benefit) 3,820,000,000us-gaap_CurrentIncomeTaxExpenseBenefit (12,000,000)us-gaap_CurrentIncomeTaxExpenseBenefit 6,503,000,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense/ (benefit)      
U.S. federal 3,738,000,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 7,080,000,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 2,238,000,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Non-U.S. 71,000,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit 10,000,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit (327,000,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
U.S. state and local 401,000,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 913,000,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (781,000,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred income tax expense/(benefit) 4,210,000,000us-gaap_DeferredIncomeTaxExpenseBenefit 8,003,000,000us-gaap_DeferredIncomeTaxExpenseBenefit 1,130,000,000us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense 8,030,000,000us-gaap_IncomeTaxExpenseBenefit 7,991,000,000us-gaap_IncomeTaxExpenseBenefit 7,633,000,000us-gaap_IncomeTaxExpenseBenefit
Components of income tax expense/(benefit), supplemental information      
Tax benefits recorded as a result of tax audit resolutions 451,000,000us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions 531,000,000us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions 200,000,000us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions
Income tax effects allocated directly to equity (140,000,000)us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquity 2,100,000,000us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquity (1,900,000,000)us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquity
Pretax undistributed foreign earnings of subsidiaries 2,600,000,000jpm_UndistributedEarningsOfForeignSubsidiariesPretax    
Cumulative pretax undistributed foreign earnings of subsidiaries 31,100,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries    
Undistributed foreign earnings, deferred tax liabilities 4,444,000,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings 4,705,000,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings  
Tax expense applicable to securities gains and losses 30,000,000jpm_TaxExpenseBenefitSecuritiesGainsAndLosses 261,000,000jpm_TaxExpenseBenefitSecuritiesGainsAndLosses 822,000,000jpm_TaxExpenseBenefitSecuritiesGainsAndLosses
Pro Forma      
Components of income tax expense/(benefit), supplemental information      
Undistributed foreign earnings, deferred tax liabilities $ 7,000,000,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember		    
UNITED KINGDOM      
Components of income tax expense/(benefit), supplemental information      
Foreign statutory income tax rate 21.50%jpm_StatutoryIncomeTaxRateForeign
/ us-gaap_IncomeTaxAuthorityAxis
= country_GB