Fair Value Measurement - Nonrecurring Basis (Details 2) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Fair value adjustments associated with unfunded held-for-sale lending-related commitments within the leveraged lending portfolio	$ 437	$ 517
Total other assets [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Total other assets	337	391
Total other assets [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Level 1 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Total other assets	0	0
Total other assets [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Level 2 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Total other assets	75	78
Total other assets [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Level 3 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Total other assets	262	313
Other real estate owned [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Total other assets	306	389
Other real estate owned [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Level 1 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Total other assets	0	0
Other real estate owned [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Level 2 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Total other assets	60	78
Other real estate owned [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Level 3 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Total other assets	246	311
Other assets [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Total other assets	31	2
Other assets [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Level 1 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Total other assets	0	0
Other assets [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Level 2 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Total other assets	15	0
Other assets [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Level 3 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Total other assets	16	2
Fair Value, Measurements, Nonrecurring [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Loans retained	3,404	5,997
Loans held-for-sale	1,086	3,512
Total loans	4,490	9,509
Total assets at fair value on a nonrecurring basis	4,827	9,900
Accounts payable and other liabilities	66	71
Total liabilities at fair value on a nonrecurring basis	66	71
Fair Value, Measurements, Nonrecurring [Member] \| Level 1 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Loans retained	0	0
Loans held-for-sale	0	0
Total loans	0	0
Total assets at fair value on a nonrecurring basis	0	0
Accounts payable and other liabilities	0	0
Total liabilities at fair value on a nonrecurring basis	0	0
Fair Value, Measurements, Nonrecurring [Member] \| Level 2 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Loans retained	3,191	5,484
Loans held-for-sale	604	312
Total loans	3,795	5,796
Total assets at fair value on a nonrecurring basis	3,870	5,874
Accounts payable and other liabilities	43	53
Total liabilities at fair value on a nonrecurring basis	43	53
Fair Value, Measurements, Nonrecurring [Member] \| Level 3 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Loans retained	213	513
Loans held-for-sale	482	3,200
Total loans	695	3,713
Total assets at fair value on a nonrecurring basis	957	4,026
Accounts payable and other liabilities	23	18
Total liabilities at fair value on a nonrecurring basis	$ 23	$ 18

Assets and liabilities measured at fair value on a nonrecurring basis Abstract.

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Namespace Prefix:	jpm
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the fair value adjustments associated with unfunded held-for-sale lending-related commitments.

+ Details

Name:	jpm_FairValueAdjustmentsAssociatedWithUnfundedHeldForSaleLendingrelatedCommitments
Namespace Prefix:	jpm
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the disclosure related to loans and leases receivable retained (not held-for-sale) that are measured at fair value on a nonrecurring basis in periods after initial recognition.

+ Details

Name:	jpm_LoansRetainedFairValueDisclosure
Namespace Prefix:	jpm
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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 sum of trade and related party payables and accrued expenses as of the balance sheet date.

+ Details

Name:	us-gaap_AccountsPayableAndAccruedLiabilitiesFairValueDisclosure
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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 nonrecurring 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.

+ Details

Name:	us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value 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.

+ Details

Name:	us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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 loans held-for-sale as presented on the statement of financial position which may include mortgage loans held-for-sale, finance receivables held-for-sale, or any other loans classified as held-for-sale which are due the Company as of the balance sheet date.

+ Details

Name:	us-gaap_LoansHeldForSaleFairValueDisclosure
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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 loan receivable as presented on the statement of financial position which may include mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts, or any other loans which are due the Company as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 4

-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 Accounting Standards Codification

-Glossary Loan

-Topic 310

-SubTopic 10

-URI http://asc.fasb.org/extlink&oid=6517073

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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 element represents the fair value of assets categorized as other which are not in and of themselves material enough to require separate disclosure.

+ Details

Name:	us-gaap_OtherAssetsFairValueDisclosure
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant