Represents the excess/(deficit) of the fair values of assets available to repay the liquidity facilities, if drawn.

No definition available.

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

- Details

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

- Definition

Variable Interest Entity, Weighted-Average Expected Life of Assets, Unconsolidated VIE.

+ References

No definition available.

+ Details

Name:	jpm_VariableInterestEntityWeightedAverageExpectedLifeOfAssetsUnconsolidatedVIE
Namespace Prefix:	jpm_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.18)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 7

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 18

-Article 5

+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph b

-URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5747-111685

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	dei_LegalEntityAxis=jpm_NonconsolidatedMunicipalBondVehiclesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
Namespace Prefix:
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Variable Interest Entities - Municipal Bond Vehicle VIEs (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Firm's exposure to nonconsolidated municipal bond VIEs [Abstract]
Assets	$ 2,573,126,000,000us-gaap_Assets	$ 2,415,689,000,000us-gaap_Assets	$ 2,359,141,000,000us-gaap_Assets
Not the Primary Beneficiary, Nonconsolidated Municipal Bond Vehicles \| Municipal bond vehicles
Firm's exposure to nonconsolidated municipal bond VIEs [Abstract]
Assets	11,500,000,000	11,800,000,000
Liquidity facilities provided by Firm serving as liquidity provider	6,300,000,000	6,900,000,000
Excess/ (deficit)	5,200,000,000	4,900,000,000
Weighted average expected life of assets (years)	4 years 10 months 18 days	7 years 2 months 12 days
Not the Primary Beneficiary, Nonconsolidated Municipal Bond Vehicles \| Municipal bond vehicles \| Investment Grade AAA to AAA-
Firm's exposure to nonconsolidated municipal bond VIEs [Abstract]
Assets	2,700,000,000	2,700,000,000
Not the Primary Beneficiary, Nonconsolidated Municipal Bond Vehicles \| Municipal bond vehicles \| Investment Grade AAplus to AA-
Firm's exposure to nonconsolidated municipal bond VIEs [Abstract]
Assets	8,400,000,000	8,900,000,000
Not the Primary Beneficiary, Nonconsolidated Municipal Bond Vehicles \| Municipal bond vehicles \| Investment Grade Aplus to A-
Firm's exposure to nonconsolidated municipal bond VIEs [Abstract]
Assets	400,000,000	200,000,000
Not the Primary Beneficiary, Nonconsolidated Municipal Bond Vehicles \| Municipal bond vehicles \| Investment Grade BBBplus to BBB-
Firm's exposure to nonconsolidated municipal bond VIEs [Abstract]
Assets	0	0
Not the Primary Beneficiary, Nonconsolidated Municipal Bond Vehicles \| Municipal bond vehicles \| Non Investment Grade BBplus and below
Firm's exposure to nonconsolidated municipal bond VIEs [Abstract]
Assets	0	0
Variable Interest Entity, Not Primary Beneficiary \| Municipal bond vehicles
Firm's exposure to nonconsolidated municipal bond VIEs [Abstract]
Maximum exposure	$ 6,300,000,000	$ 6,900,000,000