Amount recognized in accumulated other comprehensive income, before tax, to reflect the write-down of the amortized cost basis of available-for-sale debt securities for other than temporary impairments.

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Data Type:	xbrli:monetaryItemType
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- Definition

This item represents the assumed collateral default rates during the current period.

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- Definition

This item represents the current assumed collateral default rates for periods subsequent to the balance sheet date.

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Name:	jpm_CurrentCollateralDefaultRatesThereafter
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Data Type:	us-types:percentItemType
Balance Type:	na
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- Definition

Due period of mortgage-backed securities and collateralized mortgage obligations.

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Data Type:	us-types:textBlockItemType
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Period Type:	duration

- Definition

Gross unrealized losses related to collateralized debt and loan obligations.

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

- Definition

Gross unrealized losses, related to securities having unrealized loss position for longer than 12 months.

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Name:	jpm_GrossUnrealizedLossesRelatedToSecuritiesHavingUnrealizedLossPositionForLongerThan12Months
Namespace Prefix:	jpm
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This item represents the loss severities for debt securities.

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Name:	jpm_LossSeveritiesForDebtSecurities
Namespace Prefix:	jpm
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

This item represents the loss severities for loans.

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Name:	jpm_LossSeveritiesForLoans
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Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

This item represents the estimated duration, which reflects anticipated future prepayments based on a consensus of dealers in the market, on non-agency residential collateralized mortgage obligations.

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The amount of other than temporary impairment loss on a debt security, categorized as either Available-for-sale or Held-to-maturity, related to factors other than credit losses when the entity does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis. This amount, which includes the portion attributable to the noncontrolling interest, if any, is deducted from the total impairment losses of investments (before taxes) presented on the income statement; this amount is also referred to as the amount incurred by the reporting entity or the consolidated entity.

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Name:	jpm_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest
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- Definition

The amount of other than temporary impairment losses on investments when the entity intends to sell the securities.

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Period Type:	duration

- Definition

Percentage of investment grade credit enhancement.

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Period Type:	instant

- Definition

Percentage of investment grade positons.

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- Definition

Proceeds from securities sold, as percentage of amortized cost.

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Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Securities.

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- Definition

This item represents the time period after which losses on collateral were estimated to occur.

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- Definition

This item represents the estimated duration, which reflects anticipated future prepayments based on a consensus of dealers in the market, on residential collateralized mortgage obligations issued by US Government Agencies, such as the Government National Mortgage Association (GNMA or Ginnie Mae), and US Government-sponsored Enterprises, such as the Federal Home Loan Mortgage Corporation (FHLMC or Freddie Mac), Federal National Mortgage Association (FNMA or Fannie Mae), and the Federal Home Loan Bank (FHLB).

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Data Type:	xbrli:stringItemType
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- Definition

This item represents the estimated duration, which reflects anticipated future prepayments based on a consensus of dealers in the market, on residential mortgage-backed securities issued by US Government Agencies, such as the Government National Mortgage Association (GNMA or Ginnie Mae), and US Government-sponsored Enterprises, such as the Federal Home Loan Mortgage Corporation (FHLMC or Freddie Mac), Federal National Mortgage Association (FNMA or Fannie Mae), and the Federal Home Loan Bank (FHLB).

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- Definition

This element represents the percentage of securities issued by U.S. government agencies and U.S. government-sponsored enterprises that exceeded ten percent of stockholders' equity.

+ Details

Name:	jpm_USGovernmentAndGovernmentAgenciesAndAuthoritiesAndUSGovernmentSponsoredEnterpriseSecuritiesInExcessOfTenPercentOfStockholdersEquity
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Balance Type:	na
Period Type:	duration

- Definition

Debt securities collateralized by real estate mortgage loans (mortgages), issued by US Government Sponsored Enterprises, such as Federal Home Loan Mortgage Corporation (FHLMC or Freddie Mac), fair value.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment. This item contains disclosure of the severity and duration of the temporary impairment of the available-for-sale investments.

+ Details

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Period Type:	duration

- Definition

Weighted average underlying default rate.

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Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The difference between the carrying value and the sale price of debt securities. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents the amount of loss recognized for other than temporary impairments of investments in debt and equity securities.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 16

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Securities (Details Textuals) (USD $)	12 Months Ended
Securities (Details Textuals) (USD $)	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Securities (Textuals) [Abstract]
Losses recorded in (reclassified from) other comprehensive income	$ (6,000,000)	$ 368,000,000
Proceeds from securities sold, as percentage of amortized cost	3.00%	3.00%	2.00%
U.S. government-sponsored enterprise obligations, fair values	94,200,000,000	153,000,000,000
Other-than-temporary impairment losses recorded in accumulated other comprehensive income (loss) on available-for-sale debt securities, before tax	133,000,000	368,000,000
U.S. government agencies and U.S. government-sponsored enterprises securities that exceeded 10% of stockholders' equity	10.00%
Due period of residential mortgage-backed securities and collateralized mortgage obligations	10 years or more
Duration for agency residential mortgage-backed securities	5 years
Duration for agency residential collateralized mortgage backed obligations	3 years
Duration for nonagency residential collateralized mortgage obligations	6 years
Other-than-temporary impairment losses recognized in income on certain subprime mortgage-backed securities		7,000,000
Mortgage-backed securities [Member]
Securities (Textuals) [Abstract]
Gross unrealized losses, related to securities having unrealized loss position for longer than 12 months, Prime and Alt-A non-agency	200,000,000
Below investment grade credit enhancement		9.00%
Investment grade credit enhancement		24.00%
Prime and Alt A [Member]
Securities (Textuals) [Abstract]
Gross unrealized losses, related to securities having unrealized loss position for longer than 12 months, Prime and Alt-A non-agency	250,000,000
Weighted average underlying default rate	21.00%
Weighted average loss severity rate	50.00%
Subprime (Member)
Securities (Textuals) [Abstract]
Recovery of Other-than-temporary impairment losses on certain subprime mortgage-backed securities the Firm sold		1,000,000
Losses due to other-than temporary impairment of subprime mortgage-backed securities			76,000,000
Collateralized loan obligations [Member] \| Asset-backed securities [Member]
Securities (Textuals) [Abstract]
Losses recorded in (reclassified from) other comprehensive income	(6,000,000)
Gross unrealized losses related to collateralized loan obligations	$ 210,000,000
Collateral default rates during the current period	2.10%
Collateralized loan obligations [Member]
Securities (Textuals) [Abstract]
Collateral default rates after the current period	5.00%
Loss severities for loans	48.00%
Loss severities for debt securities	78.00%
Time period after which losses on collateral were estimated to occur	18