After conversion from a revolving loan, the home equity line of credit new loan amortization period.

No definition available.

Name:	jpm_HomeEquityLineOfCreditAmortizationPeriod
Namespace Prefix:	jpm_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

In general, the period of time that home equity lines of credit are open-ended revolving loans.

+ References

No definition available.

+ Details

Name:	jpm_HomeEquityLineOfCreditOpenEndedRevolvingPeriod
Namespace Prefix:	jpm_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

This item represents the percentage of loans 30 plus days past due as compared to total retained loans.

+ References

No definition available.

+ Details

Name:	jpm_PercentageOfLoansThirtyPlusDaysPastDueToTotalRetainedLoans
Namespace Prefix:	jpm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The percentage of the financing receivables that consists of senior liens.

+ References

No definition available.

+ Details

Name:	jpm_PercentageOfSeniorLiensToTotalFinancingReceivables
Namespace Prefix:	jpm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

+ Details

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

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=jpm_ConsumerExcludingCreditCardLoanPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=jpm_HomeEquityLoanandHomeEquityLineofCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LienCategoryAxis=us-gaap_SeniorLienMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LienCategoryAxis=us-gaap_JuniorLienMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=jpm_HomeEquityLineOfCreditAmortizationStatusRevolvingPeriodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=jpm_HomeEquityLineOfCreditAmortizationStatusAmortizationPeriodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Loans - Consumer, Excluding Credit Card Loan Portfolio, Delinquency Statistics Junior Lien Home Equity Loans (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 947,651	$ 924,838	$ 909,182
Consumer, excluding credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	375,958	372,553	$ 369,413
Consumer, excluding credit card \| Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 29,318	$ 33,450
Total 30 plus day delinquency rate	2.61%	3.17%
Consumer, excluding credit card \| Total \| Senior lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of senior liens to total financing receivables	37.00%
Consumer, excluding credit card \| Total \| Junior lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 18,568	$ 21,266
Total 30 plus day delinquency rate	2.04%	2.64%
Consumer, excluding credit card \| HELOANs \| Junior lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,104	$ 1,371
Total 30 plus day delinquency rate	2.99%	3.50%
Consumer, excluding credit card \| HELOCs, Within the revolving period \| HELOCs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Open-ended revolving period	10 years
Consumer, excluding credit card \| HELOCs, Within the revolving period \| HELOCs \| Junior lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 5,482	$ 6,363
Total 30 plus day delinquency rate	0.22%	0.50%
Consumer, excluding credit card \| HELOCs, Beyond the revolving period \| HELOCs
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortization period	20 years
Consumer, excluding credit card \| HELOCs, Beyond the revolving period \| HELOCs \| Junior lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 11,982	$ 13,532
Total 30 plus day delinquency rate	2.78%	3.56%