Securities (Details 4) (USD $) In Millions	3 Months Ended
Mar. 31, 2011	Mar. 31, 2010
Changes in the credit loss component of credit-impaired debt securities, securities with no intent to sell [Abstract]
Balance, beginning of period	$ 632	$ 578
Additions:
Newly credit-impaired securities	4
Increase in losses on previously credit-impaired securities	0	94
Losses reclassified from other comprehensive income on previously credit-impaired securities	26	6
Reductions:
Sales of credit-impaired securities	0	(3)
Impact of new accounting guidance related to VIEs	0	(15)
Balance, end of period	$ 662	$ 660

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

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Balance Type:	credit
Period Type:	duration