Securities (Details 4) (USD $) In Millions	12 Months Ended
Dec. 31, 2010	Dec. 31, 2009
Changes in the credit loss component of credit-impaired debt securities, securities with no intent to sell [Abstract]
Balance, beginning of period	$ 578	$ 0
Additions:
Newly credit-impaired securities	0	578
Increase in losses on previously credit-impaired securities	94	0
Losses reclassified from other comprehensive income on previously credit-impaired securities	6	0
Reductions:
Sales of credit-impaired securities	(31)	0
Impact of new accounting guidance related to VIEs	(15)	0
Balance, end of period	$ 632	$ 578

Additions Abstract.

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- Definition

This element represents the balance of the credit loss component for other than temporary impairment losses that have been recognized in income, related to debt securities that are not held-for-sale.

+ Details

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- Definition

Changes in the credit loss component of credit-impaired debt securities, Securities Not Held For Sale.

+ Details

Name:	jpm_ChangesInCreditLossComponentOfCreditImpairedDebtSecuritiesSecuritiesNotHeldForSaleAbstract
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- Definition

Increase in losses on previously credit-impaired securities.

+ Details

Name:	jpm_IncreaseInLossesOnPreviouslyCreditImpairedSecuritiesNotHeldForSale
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- Definition

This element represents the losses reclassified from other comprehensive income on previously credit-impaired debt securities.

+ Details

Name:	jpm_LossesRecordedInReclassifiedFromOtherComprehensiveIncome
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- Definition

Amount of the cumulative effect of the change in accounting principle on the credit loss component of OTTI losses that have been recognized in income, related to debt securities that the Firm does not intend to sell.

+ Details

Name:	jpm_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnCreditLossComponentOfOtherThanTemporaryImpairmentLosses
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- Definition

This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which no such other than temporary impairment (OTTI) was previously recognized.

+ Details

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- Definition

Reductions Abstract.

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- Definition

Sales of credit-impaired securities.

+ Details

Name:	jpm_SalesOfCreditImpairedSecurities
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Balance Type:	credit
Period Type:	duration