Goodwill and Other Intangible Assets - Mortgage Servicing Rights (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Mortgage servicing rights activity [Abstract]
Fair value at the beginning of the period	$ 7,436,000,000us-gaap_ServicingAssetAtFairValueAmount	$ 9,614,000,000us-gaap_ServicingAssetAtFairValueAmount
MSR activity:
Originations of MSRs	155,000,000	192,000,000
Purchase of MSRs	1,000,000	3,000,000
Disposition of MSRs	(157,000,000)	(188,000,000)
Net additions	(1,000,000)jpm_MortgageServicingRightsNetAdditions	7,000,000jpm_MortgageServicingRightsNetAdditions
Changes due to collection/realization of expected cash flows	(215,000,000)	(247,000,000)
Changes in valuation due to inputs and assumptions:
Changes due to market interest rates and other	(477,000,000)	(362,000,000)
Changes in valuation due to other inputs and assumptions:
Projected cash flows (e.g., cost to service)	(10,000,000)	(11,000,000)
Discount rates	(10,000,000)	(449,000,000)
Prepayment model changes and other	(82,000,000)	0
Total changes in valuation due to other inputs and assumptions	(102,000,000)	(460,000,000)
Total changes in valuation due to inputs and assumptions	(579,000,000)	(822,000,000)
Fair value at March 31	6,641,000,000us-gaap_ServicingAssetAtFairValueAmount	8,552,000,000us-gaap_ServicingAssetAtFairValueAmount
Change in unrealized gains/(losses) included in income related to MSRs held at March 31	(579,000,000)	(822,000,000)
Contractual service fees, late fees and other ancillary fees included in income	667,000,000	757,000,000
Third-party mortgage loans serviced at March 31 (in billions)	728,000,000,000	809,000,000,000
Servicer advances at March 31 (in billions)	7,900,000,000jpm_ServicerAdvancesOnMortgageLoans	9,200,000,000jpm_ServicerAdvancesOnMortgageLoans
MSR activity supplemental information
Commercial real estate, fair value period increase (decrease)	(2,000,000)	(2,000,000)
Commercial real estate, fair value	$ 9,000,000jpm_CommercialRealEstateFairValue	$ 16,000,000jpm_CommercialRealEstateFairValue

Fair value of commercial real estate at period end.

No definition available.

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- Definition

Changes in the fair value of commercial real estate during the period.

+ References

No definition available.

+ Details

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- Definition

Third party mortgage loans serviced at period end.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Details

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- Details

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- Definition

Change in unrealized gains (losses) included in income related to MSRs.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Details

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- Definition

The net additions of Mortgage Servicing Rights (MSRs).

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Represents contractual amounts the Firm pays as the servicer to third parties for scheduled principal and interest to a trust, taxes, insurance, default related expenses, etc. The advances are recovered from borrower payments [upon reperformance] or future cash flows at the time of liquidation of the or sale of the collateral.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

The value of new servicing assets, subsequently measured at fair value, created during the current period through transfers of financial assets.

+ References

No definition available.

+ Details

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- Definition

The value of new servicing assets, subsequently measured at fair value, acquired during the current period through purchases.

+ References

No definition available.

+ Details

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- Definition

Changes in servicing asset fair value due to collection/realization of expected cash flows.

+ References

No definition available.

+ Details

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- Details

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- Definition

The net Increase or decrease in fair value as a result of changes in other inputs, assumptions, or model used to calculate the fair value of servicing assets.

+ References

No definition available.

+ Details

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- Definition

The net increase or decrease in fair value as a result of changes in inputs, assumptions, or model relating to discount rates, used to calculate the fair value of servicing assets

+ References

No definition available.

+ Details

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- Definition

The net increase or decrease in fair value as a result of changes in estimated future prepayments due to changes in market interest rates, and the difference between actual and expected prepayments.

+ References

No definition available.

+ Details

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- Definition

The net increase or decrease in fair value as a result of changes in inputs, assumptions, or model relating to prepayment model changes and other, used to calculate the fair value of servicing assets

+ References

No definition available.

+ Details

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- Definition

The net increase or decrease in fair value as a result of changes in inputs, assumptions, or model relating to projected cash flows, used to calculate the fair value of servicing assets

+ References

No definition available.

+ Details

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- Definition

All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122596-111746

+ Details

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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746

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- Definition

The net Increase or Decrease in fair value as a result of changes in the inputs, assumptions, or model used to calculate the fair value of servicing assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 3

-Subparagraph (a)(4)(i)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746

+ Details

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- Definition

Decrease in servicing assets subsequently measured at fair value resulting from conveyance of servicing rights to unrelated parties.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 3

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746

+ Details

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