Fair Value, Assets, Level 3 to Level 2 Transfers, Amount

No definition available.

Name:	jpm_FairValueAssetsLevel3toLevel2TransfersAmount
Namespace Prefix:	jpm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Realized and Unrealized Gains (Losses)

+ References

No definition available.

+ Details

Name:	jpm_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetRealizedandUnrealizedGainsLosses
Namespace Prefix:	jpm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Net Derivative Asset (Liability), Realized and Unrealized Gains (Losses)

+ References

No definition available.

+ Details

Name:	jpm_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisNetDerivativeAssetLiabilityRealizedandUnrealizedGainsLosses
Namespace Prefix:	jpm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This item represents the change during the period in the amount assets which are measured at fair value on either a recurring or nonrecurring basis and fall within Level 3 of the fair value measurements hierarchy. Level 3 inputs are unobservable inputs for the asset. Unobservable inputs are used to measure fair value to the extent that observable inputs are not available; such as, when there is little, if any, market activity for the asset or liability at the measurement date.

+ References

No definition available.

+ Details

Name:	jpm_IncreaseDecreaseInLevel3Assets
Namespace Prefix:	jpm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This item represents the change, due to sales, during the period in the amount of assets which are measured at fair value on either a recurring or nonrecurring basis and fall within Level 3 of the fair value measurements hierarchy. Level 3 inputs are unobservable inputs for the asset. Unobservable inputs are used to measure fair value to the extent that observable inputs are not available; such as, when there is little, if any, market activity for the asset or liability at the measurement date.

+ References

No definition available.

+ Details

Name:	jpm_IncreaseDecreaseInLevel3AssetSalesAmounts
Namespace Prefix:	jpm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	jpm_Level3AnalysisSupplementalDataAbstract
Namespace Prefix:	jpm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of level 3 assets as compared to total assets of the entity.

+ References

No definition available.

+ Details

Name:	jpm_PercentageOfLevel3AssetsToTotalAssets
Namespace Prefix:	jpm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CreditRiskContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_EquityContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=jpm_DebtAndEquityInstrumentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_DerivativeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_PrivateEquityFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_ServicingContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Fair Value Measurement - Level 3 Analysis (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Level 3 Analysis - Supplemental Data [Abstract]
Percentage of level 3 assets in total Firm assets	2.10%
Net derivative asset (liability), total realized/unrealized gains/(losses)	$ (413,000,000)	$ 2,904,000,000
Equity contracts
Level 3 Analysis - Supplemental Data [Abstract]
Net derivative asset (liability), total realized/unrealized gains/(losses)	154,000,000	2,528,000,000	160,000,000
Interest rate contracts
Level 3 Analysis - Supplemental Data [Abstract]
Net derivative asset (liability), total realized/unrealized gains/(losses)	184,000,000	1,358,000,000	6,930,000,000
Credit derivatives
Level 3 Analysis - Supplemental Data [Abstract]
Net derivative asset (liability), total realized/unrealized gains/(losses)	(149,000,000)	(1,697,000,000)	(4,487,000,000)
Derivative
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets	(6,000,000,000)
Net derivative asset (liability), total realized/unrealized gains/(losses)			1,130,000,000
Derivative \| Equity contracts
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets	(4,500,000,000)
Derivative \| Interest rate contracts
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets	(1,200,000,000)
Debt securities
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets	(4,700,000,000)
Assets, level 3 to level 2 transfers	2,900,000,000
Asset, total realized/unrealized gains/(losses)	716,000,000	1,724,000,000	1,274,000,000
Private equity
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets	(4,000,000,000)
Increase (decrease) in level 3 asset sales	2,000,000,000
Assets, level 3 to level 2 transfers	2,300,000,000
Asset, total realized/unrealized gains/(losses)	443,000,000	645,000,000	420,000,000
Total debt and equity instruments
Level 3 Analysis - Supplemental Data [Abstract]
Asset, total realized/unrealized gains/(losses)	1,066,000,000	2,237,000,000	1,251,000,000
Mortgage servicing rights
Level 3 Analysis - Supplemental Data [Abstract]
Increase (decrease) in level 3 assets	(2,200,000,000)
Asset, total realized/unrealized gains/(losses)	(1,826,000,000)	1,612,000,000	(635,000,000)
Recurring
Level 3 Analysis - Supplemental Data [Abstract]
Assets fair value	749,730,000,000	760,327,000,000
Recurring \| Private equity
Level 3 Analysis - Supplemental Data [Abstract]
Assets, level 3 to level 2 transfers	2,300,000,000
Recurring \| Level 3
Level 3 Analysis - Supplemental Data [Abstract]
Assets fair value	50,914,000,000	69,310,000,000
Increase (decrease) in level 3 assets	$ (18,400,000,000)