The carrying value of the related liability of loans sold with recourse.

No definition available.

Name:	jpm_IndemnificationAgreementsLoanSaleAndSecuritizationLoansSoldWithRecourseCarryingValue
Namespace Prefix:	jpm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The contractual amount (unpaid principal balance) of loans sold with recourse.

+ References

No definition available.

+ Details

Name:	jpm_IndemnificationAgreementsLoanSaleAndSecuritizationLoansSoldWithRecourseContractualAmount
Namespace Prefix:	jpm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	jpm_LoanSalesAndSecuritizationRelatedIndemnificationsAbstract
Namespace Prefix:	jpm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	jpm_LoansSoldWithRecourseAbstract
Namespace Prefix:	jpm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of decline in home prices assumption.

+ References

No definition available.

+ Details

Name:	jpm_PercentageOfDeclineInHomePricesAssumption
Namespace Prefix:	jpm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of decline in home prices assumption beyond firms current assumptions.

+ References

No definition available.

+ Details

Name:	jpm_PercentageOfDeclineInHomePricesAssumptionBeyondFirmsCurrentAssumptions
Namespace Prefix:	jpm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	jpm_SummaryOfChangesInRepurchaseLiabilityRollforward
Namespace Prefix:	jpm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Total probable recoveries from third parties which is netted against the liabilities established to represent expected future costs.

+ References

No definition available.

+ Details

Name:	jpm_ValuationAllowancesAndReservesProbableRecoveriesFromThirdParties
Namespace Prefix:	jpm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Valuation allowances and reserves provision.

+ References

No definition available.

+ Details

Name:	jpm_ValuationAllowancesAndReservesProvision
Namespace Prefix:	jpm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date.

+ References

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

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 14

-Paragraph 3

-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.

+ Details

Name:	us-gaap_LossContingencyRangeOfPossibleLossPortionNotAccrued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

Name:	us-gaap_ValuationAllowancesAndReservesBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Total of the deductions in a given period to 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, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

+ References

+ Details

Name:	us-gaap_ValuationAllowancesAndReservesDeductions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Off-Balance Sheet Lending-Related Financial Instruments, Guarantees and Other Commitments Loan Sales and Mortgage Repurchase Liability (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Loan sales and securitization-related indemnifications
Percentage Of Decline In Home Prices Assumption	37.00%
Percentage Of Decline In Home Prices Assumption Beyond Firms Current Assumptions	8.00%
Mortgage Repurchase Liability
Loan sales and securitization-related indemnifications
Valuation Allowances and Reserves Probable Recoveries From Third Parties	$ 412,000,000		$ 441,000,000
Summary of changes in mortgage repurchase liability
Allowance for lending-related commitments, Beginning balance at January 1	2,811,000,000	3,557,000,000
Valuation Allowances and Reserves, Deductions	(212,000,000)	(364,000,000)
Valuation Allowances And Reserves Current Year Provision	75,000,000	323,000,000
Valuation allowances, Ending balance at March 31	2,674,000,000	3,516,000,000
Repurchase Make-Whole Settlements
Summary of changes in mortgage repurchase liability
Valuation Allowances and Reserves, Deductions	(121,000,000)	(186,000,000)
New Loans Sold During Period
Summary of changes in mortgage repurchase liability
Valuation Allowances And Reserves Current Year Provision	8,000,000	27,000,000
Loans Sold With Recourse
Summary of changes in mortgage repurchase liability
Allowance for lending-related commitments, Beginning balance at January 1			141,000,000
Valuation allowances, Ending balance at March 31	139,000,000		141,000,000
Loans sold with recourse
Indemnification Agreements Loan Sale And Securitization Loans Sold With Recourse Contractual Amount	9,000,000,000		9,300,000,000
Indemnification Agreements, Loan Sale and Securitization, Loans Sold with Recourse: Carrying Value	139,000,000		141,000,000
Minimum \| Mortgage Repurchase Liability
Loan sales and securitization-related indemnifications
Loss Contingency, Range of Possible Loss, Portion Not Accrued	0
Maximum \| Mortgage Repurchase Liability
Loan sales and securitization-related indemnifications
Loss Contingency, Range of Possible Loss, Portion Not Accrued	$ 900,000,000