The contractual amount of off-balance sheet lending-related financial instruments (e.g., commitments and guarantees), which represents the maximum possible credit risk should the counterparty draw upon the commitment or the entity be required to fulfill its obligation under the guarantee, and the counterparty subsequently fail to perform according to the terms of the contract.

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Namespace Prefix:	jpm
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Collateral held relating to other letters of credit.

+ Details

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

- Definition

Standby letters of credit and other financial guarantees and other letters of credit.

+ Details

Name:	jpm_StandbyLettersOfCreditAndOtherFinancialGuaranteesAndOtherLettersOfCreditAbstract
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Balance Type:	na
Period Type:	duration

- Definition

Standby letters of credit and other financial guarantees which are rated as investment-grade per company defined internal payment/performance risk groupings used for managing risk.

+ Details

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Namespace Prefix:	jpm
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Standby letters of credit and other financial guarantees which are rated as noninvestment-grade per company defined internal payment/performance risk groupings used for managing risk.

+ Details

Name:	jpm_StandbyLettersOfCreditAndOtherFinancialGuaranteesInternalCreditRatingNonInvestmentGrade
Namespace Prefix:	jpm
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Collateral held relating to standby letters of credit.

+ Details

Name:	jpm_StandbyLettersOfCreditCollateralHeld
Namespace Prefix:	jpm
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 09
-Article 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690

+ Details

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Off-Balance Sheet Lending-Related Financial Instruments, Guarantees and Other Commitments - Standby and Other Letters of Credit and Other Financial Guarantees (Details 1) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010	Dec. 31, 2009
Standby letters of credit and other financial guarantees and other letters of credit [Abstract]
Total lending related commitments	$ 965,963	$ 958,709	$ 944,493
Allowance for lending-related commitments	626	717	912	939
Wholesale
Standby letters of credit and other financial guarantees and other letters of credit [Abstract]
Total lending related commitments	365,689	346,079
Standby Letters of Credit, and Other Financial Guarantees [Member]
Standby letters of credit and other financial guarantees and other letters of credit [Abstract]
Investment-grade	74,222	70,236
Noninvestment-grade	22,828	24,601
Total lending related commitments	97,050	94,837
Allowance for lending-related commitments	314	345
Commitments with collateral	39,335	37,815
Other letters of credit
Standby letters of credit and other financial guarantees and other letters of credit [Abstract]
Investment-grade	4,399	5,289
Noninvestment-grade	1,369	1,374
Total lending related commitments	5,768	6,663
Allowance for lending-related commitments	2	2
Commitments with collateral, other letters of credit	$ 1,748	$ 2,127