Restrictions on Cash and Intercompany Funds Transfers (Details) (USD $) In Billions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Reserve Balances Deposited with Federal Reserve Banks [Abstract]
Average amount of reserve balances deposited by the Firm's bank subsidiaries with various Federal Reserve Banks	$ 10.6jpm_DepositsWithFederalReserveBanks	$ 5.3jpm_DepositsWithFederalReserveBanks
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Federal Restriction on Secured Borrowings from Subsidiaries, Per Loan, Portion of Subsidiary Total Capital, Percentage	10.00%
Federal Restriction on Secured Borrowings from Subsidiaries, All Loans, Portion of Subsidiary Total Capital, Percentage	20.00%
Cash and Securities Segregated under Federal and Other Regulations Disclosures [Abstract]
Amount of cash that was segregated in special bank accounts for the benefit of securities and futures brokerage customers	16.8	17.2
Amount of securities at fair value that were segregated in special bank accounts for the benefit of securities and futures brokerage customers	10.1	1.5
Restricted cash and cash equivalents	3.3	3.9
Bank and Bank Holding Company Subsidiaries
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Amount Available for Dividend Distribution by Banking Subsidiaries without Prior Approval from Regulatory Agency	$ 31

Interest-bearing deposits in various Federal Reserve Banks.

No definition available.

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

- Definition

Federal law imposes a restriction which prohibits the parent entity and certain of its affilliates from borrowing from banking subsidiaries unless the loans are secured in specified amounts. This concept holds the limit for the aggregate amount of all such secured loans as a percentage of the banking subsidiary's total capital.

+ References

No definition available.

+ Details

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

- Definition

Federal law imposes a restriction which prohibits the parent entity and certain of its affilliates from borrowing from banking subsidiaries unless the loans are secured in specified amounts. This concept holds the general limit for such a secured loan as a percentage of the banking subsidiary's total capital.

+ References

No definition available.

+ Details

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

- Details

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

- Details

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

- Definition

Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 305

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6478312&loc=d3e61473-112792

+ Details

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

- Details

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

- Definition

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Securities deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations.

+ References

No definition available.

+ Details

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

- Definition

Amount of dividends that can be declared or paid without approval of regulatory agency.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(e))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph e

-Article 4

+ Details

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

- Details

Name:	dei_LegalEntityAxis=jpm_BankAndBankHoldingCompanySubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: