Variable Interest Entities - Interest in Securitized Assets Held at Fair Value (Details 6) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2012	Dec. 31, 2011
Key economic assumptions used to determine the fair value of certain of the Firm's retained interests, other than MSRs [Abstract]
Changes In Fair Value Based On Variation In Assumptions Limit First	10.00%	20.00%
Variable Interest Entity, Not Primary Beneficiary [Member] \| Prime [Member]
Key economic assumptions used to determine the fair value of certain of the Firm's retained interests, other than MSRs [Abstract]
JPMorgan Chase interests in securitized assets	578	555
Variable Interest Entity, Not Primary Beneficiary [Member] \| Subprime [Member]
Key economic assumptions used to determine the fair value of certain of the Firm's retained interests, other than MSRs [Abstract]
JPMorgan Chase interests in securitized assets	28	31
Variable Interest Entity, Not Primary Beneficiary [Member] \| Option Arms
Key economic assumptions used to determine the fair value of certain of the Firm's retained interests, other than MSRs [Abstract]
JPMorgan Chase interests in securitized assets	23	23
Variable Interest Entity, Not Primary Beneficiary [Member] \| Commercial mortgage [Member]
Key economic assumptions used to determine the fair value of certain of the Firm's retained interests, other than MSRs [Abstract]
JPMorgan Chase interests in securitized assets	3,311	3,663
Weighted-average life (in years)	2.8	3.0
Weighted-average constant prepayment rate	0.00%	0.00%
Impact of 10% adverse change	0	0
Impact of 20% adverse change	0	0
Weighted-average loss assumption	0.00%	0.20%
Impact of 10% adverse change	(20)	(61)
Impact of 20% adverse change	(36)	(119)
Weighted-average discount rate	16.00%	28.20%
Impact of 10% adverse change	(38)	(75)
Impact of 20% adverse change	(68)	(136)

Changes in fair value based on variation in assumptions limit first.

No definition available.

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- Details

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- Definition

The hypothetical financial impact of a 10 percent adverse change of the discount rate on the fair value of interests that continue to be held by the transferor (other than servicing assets or servicing liabilities) as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	jpm_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorOtherThanServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
Namespace Prefix:	jpm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The hypothetical financial impact of a 10 percent adverse change of the expected credit losses on the fair value of interests that continue to be held by the transferor (other than servicing assets or servicing liabilities) as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	jpm_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorOtherThanServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInExpectedCreditLosses
Namespace Prefix:	jpm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The hypothetical financial impact of a 10 percent adverse change of prepayment speed on the fair value of interests that continue to be held by the transferor (other than servicing assets or servicing liabilities) as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	jpm_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

The hypothetical financial impact of a 20 percent adverse change of the discount rate on the fair value of interests that continue to be held by the transferor (other than servicing assets or servicing liabilities) as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	jpm_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorOtherThanServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate
Namespace Prefix:	jpm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The hypothetical financial impact of a 20 percent adverse change of the expected credit losses on the fair value of interests that continue to be held by the transferor (other than servicing assets or servicing liabilities) as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	jpm_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorOtherThanServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInExpectedCreditLosses
Namespace Prefix:	jpm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The hypothetical financial impact of a 20 percent adverse change of prepayment speed on the fair value of interests that continue to be held by the transfero (other than servicing assets or servicing liabilities) as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	jpm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

A specified percentage variance in the discount rate assumption in the determination of fair value of interests continued to be held other than servicing assets or servicing liabilities.

+ References

No definition available.

+ Details

Name:	jpm_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorOtherThanServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInDiscountRatePercent
Namespace Prefix:	jpm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

A specified percentage variance in the prepayment speed assumption in the determination of fair value of interests continued to be held other than servicing assets or servicing liabilities.

+ References

No definition available.

+ Details

Name:	jpm_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorOtherThanServicingAssetsOrLiabilitiesImpactOfOtherThan10Or20PercentAdverseChangeInPrepaymentSpeedPercent
Namespace Prefix:	jpm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

A specified percentage variance in the expected credit losses assumption in the determination of fair value of interests continued to be held (other than servicing assets or servicing liabilities).

+ References

No definition available.

+ Details

Name:	jpm_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorOtherThanServicingAssetsOrLiabilitiesImpactOtherThan10Or20PercentAdverseChangeInExpectedCreditLossPercent
Namespace Prefix:	jpm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted Average Life Of Securitized Assets

+ References

No definition available.

+ Details

Name:	jpm_WeightedAverageLifeOfSecuritizedAssets
Namespace Prefix:	jpm_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the interests continued to be held by a transferor (retained or residual interest) after transferring financial assets to a third party.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 7

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 4, 58, 59

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant