Variable Interest Entities - Firm Sponsored Variable Interest Entities (Details) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Variable Interest Entity [Line Items]
Beneficial interest liability, at fair value	$ 65,971,000,000	$ 77,649,000,000
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Total assets held by securitization VIEs	351,800,000,000	391,100,000,000
Percentage of the Firm's retained securitization interests risk-rated 'A' or better, at fair value	63.00%	66.00%
Variable Interest Entity, Primary Beneficiary [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in consolidated securitization VIEs	8,000,000,000	8,600,000,000
Variable Interest Entity, Primary Beneficiary [Member] \| Prime [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in consolidated securitization VIEs	2,100,000,000	2,200,000,000
Variable Interest Entity, Primary Beneficiary [Member] \| Subprime [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in consolidated securitization VIEs	1,400,000,000	1,600,000,000
Variable Interest Entity, Primary Beneficiary [Member] \| Option Arms
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in consolidated securitization VIEs	300,000,000	300,000,000
Variable Interest Entity, Primary Beneficiary [Member] \| Commercial mortgage [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in consolidated securitization VIEs	0	0
Variable Interest Entity, Primary Beneficiary [Member] \| Student [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in consolidated securitization VIEs	4,200,000,000	4,500,000,000
Assets held in nonconsolidated securitization VIEs with continuing involvement	0
Firm Sponsored Credit Card Securitization Trusts [Member] \| Collateralized Credit Card Securities [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated Assets	50,100,000,000	68,500,000,000
Beneficial interest liability, at fair value	32,200,000,000	44,300,000,000
Variable Interest Entity, Not Primary Beneficiary [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in nonconsolidated securitization VIEs with continuing involvement	284,548,000,000	326,516,000,000
JPMorgan Chase interests in securitized assets	3,400,000,000	3,600,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] \| Prime [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in nonconsolidated securitization VIEs with continuing involvement	123,215,000,000	143,764,000,000
JPMorgan Chase interests in securitized assets	600,000,000	700,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] \| Prime [Member] \| Trading assets
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
JPMorgan Chase interests in securitized assets	600,000,000	700,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] \| Prime [Member] \| Available-for-sale Securities [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
JPMorgan Chase interests in securitized assets	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] \| Subprime [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in nonconsolidated securitization VIEs with continuing involvement	37,454,000,000	40,721,000,000
JPMorgan Chase interests in securitized assets	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] \| Subprime [Member] \| Trading assets
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
JPMorgan Chase interests in securitized assets	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] \| Subprime [Member] \| Available-for-sale Securities [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
JPMorgan Chase interests in securitized assets	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] \| Option Arms
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in nonconsolidated securitization VIEs with continuing involvement	32,212,000,000	35,786,000,000
JPMorgan Chase interests in securitized assets	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] \| Option Arms \| Trading assets
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
JPMorgan Chase interests in securitized assets	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] \| Option Arms \| Available-for-sale Securities [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
JPMorgan Chase interests in securitized assets	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] \| Commercial mortgage [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
JPMorgan Chase interests in securitized assets	2,800,000,000	2,900,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] \| Commercial mortgage [Member] \| Trading assets
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
JPMorgan Chase interests in securitized assets	1,700,000,000	2,000,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] \| Commercial mortgage [Member] \| Available-for-sale Securities [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
JPMorgan Chase interests in securitized assets	1,100,000,000	900,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] \| Student [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in nonconsolidated securitization VIEs with continuing involvement		0
JPMorgan Chase interests in securitized assets	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] \| Student [Member] \| Trading assets
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
JPMorgan Chase interests in securitized assets	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] \| Student [Member] \| Available-for-sale Securities [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
JPMorgan Chase interests in securitized assets	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] \| Trading assets
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
JPMorgan Chase interests in securitized assets	2,300,000,000	2,700,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] \| Available-for-sale Securities [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
JPMorgan Chase interests in securitized assets	1,100,000,000	900,000,000
External Credit Rating, Non Investment Grade [Member] \| Prime [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Retained Interest, Fair Value Disclosure	477,000,000	552,000,000
Prime [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Total assets held by securitization VIEs	132,600,000,000	153,100,000,000
Prime [Member] \| Investment Grade A or Better
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Retained Interest, Fair Value Disclosure	168,000,000	157,000,000
Subprime [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Total assets held by securitization VIEs	40,400,000,000	44,000,000,000
Option Arms
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Total assets held by securitization VIEs	32,500,000,000	36,100,000,000
External Credit Rating, Non Investment Grade [Member] \| Commercial mortgage [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Retained Interest, Fair Value Disclosure	316,000,000	250,000,000
Commercial mortgage [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Total assets held by securitization VIEs	142,100,000,000	153,400,000,000
Commercial mortgage [Member] \| Investment Grade A or Better
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Retained Interest, Fair Value Disclosure	2,400,000,000	2,600,000,000
Student [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Total assets held by securitization VIEs	4,200,000,000	4,500,000,000
Investment Bank [Member]
Firm-sponsored mortgage and other consumer securitization trusts [Abstract]
Senior Securities Purchased, Excluded from Interests Continued To Be Held By Transferor, Fair Value	229,000,000	182,000,000
Subordinated Securities Purchased, Excluded From Interests Continued To Be Held by Transferor, Fair Value	$ 28,000,000	$ 18,000,000

Firm-sponsored mortgage and other consumer securitization trusts.

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- Definition

Percent of retained securitization interests rated A or better.

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- Definition

Senior securities purchased in connection with IB secondary market making activities. These securities are excluded from entity interest in securitized assets in nonconsolidated VIEs.

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- Definition

Subordinated securities purchased in connection with IB secondary market making Activities. These securities are excluded from entity interest in securitized assets in nonconsolidated VIEs.

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- Definition

Obligation reflecting another party's right to economic interests in another entity or trust under a contractual right. For example, an investor may purchase a beneficial interest in a securitization transaction.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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The carrying amount (fair value) as of the balance sheet date of the transferor's interests in transferred financial assets (typically securitized receivables, generally not involved in the collection of principal) following transfer of significant portions of such financial instruments to other parties. Such interests could be ancillary cash flows and interest-only strips.

+ References

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This includes the recognized portion of the total principal amount of financial assets which have been either securitized, used in an asset-backed financing arrangement, or similar transfer which are accounted for as sales and in which the transferor has continuing involvement with the assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets).

+ References

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

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- Definition

This includes only the derecognized portion of the total principal amount of financial assets which have been either securitized, used in an asset-backed financing arrangement, or similar transfers which are accounted for as sales and in which the transferor has continuing involvement with the assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 17

-Subparagraph f

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-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.

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-Name FASB Staff Position (FSP)

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- Definition

The total principal outstanding of financial assets transferred in a securitization, asset-backed financing arrangement, or similar transfer that has been accounted for as sales and in which the transferor continues to have involvement, including both the derecognized and recognized portion of such transferred assets.

+ References

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

-Publisher FASB

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-Number 140

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-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.

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- 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

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-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.

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The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

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-Paragraph 3

-Subparagraph (bb)

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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