The asset specific allowance for lending related commitments.

No definition available.

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

- Definition

The allowance for lending-related commitments, evaluated at formula-based impairment methodology.

+ References

No definition available.

+ Details

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

- Definition

Impaired collateral-dependent loans.

+ References

No definition available.

+ Details

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

- Definition

Impairment methodology.

+ References

No definition available.

+ Details

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

- Definition

Reflects the carrying amount of impaired collateral dependent loans at fair value less cost to sell.

+ References

No definition available.

+ Details

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

- Definition

Loans by impairment methodology.

+ References

No definition available.

+ Details

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

- Definition

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.

+ References

No definition available.

+ Details

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

- Definition

The contractual amount of off-balance sheet lending-related financial instruments (e.g., commitments and guarantees that were individually evaluated when determining the allowance for credit losses.

+ References

No definition available.

+ Details

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

- Definition

The contractual amount of off-balance sheet lending-related financial instruments (e.g., commitments and guarantees that were collectively evaluated when determining the allowance for credit losses.

+ References

No definition available.

+ Details

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

- Definition

Off Balance Sheet Lending Related Financial Instruments Guarantees And Other Commitments Abstract.

+ References

No definition available.

+ Details

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

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

+ Details

Name:	us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of other addition (reduction) in allowance reserve for credit loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

+ Details

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

- Definition

Amount, after recoveries, of loans and leases that have been written-off.

+ References

No definition available.

+ Details

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

- Definition

The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to consumer loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544

+ Details

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

- Definition

For loans and debt securities, 1) for which at acquisition it was probable that the investor would be unable to collect all contractually required payments receivable, and 2) for which it is further probable that the investor will not be able to collect all cash flows expected at acquisition (plus any additional cash flows expected due to changes in estimate after acquisition), the allowance for credit losses recorded to reflect the impairment since acquisition.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5275-111524

+ Details

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

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7)(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447

+ Details

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

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

+ Details

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

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

+ Details

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

- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ References

+ Details

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

- 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=118952595&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=118936363&loc=d3e5074-111524

+ Details

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

- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

+ Details

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

- Details

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

- Details

Name:	us-gaap_ValuationAllowancesAndReservesTypeAxis=us-gaap_AllowanceForLoanAndLeaseLossesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ValuationAllowancesAndReservesTypeAxis=jpm_AllowanceForLendingRelatedCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Allowance for loan losses
Gross charge-offs/Write-offs of PCI loans			$ 132	$ 151
Provision for loan losses/lending-related commitments	$ 1,514	$ 948	4,158	3,323
Loans by impairment methodology
Asset-specific					$ 9,300		$ 9,381
Formula-based					898,297		913,058
PCI					21,290		25,212
Total retained loans					928,887	$ 969,415	947,651
Lending-related commitments by impairment methodology
Asset-specific					446		252
Formula-based					1,094,644		1,048,422
Total lending-related commitments					1,095,090	1,039,258	1,048,674
Impaired collateral-dependent loans
Allowance for loan losses
Net charge-offs			51	15
Impaired collateral-dependent loans
Loans measured at fair value of collateral less cost to sell					2,196		2,335
Allowance for loan losses
Allowance for loan losses
Beginning balance			13,445	13,604
Gross charge-offs/Write-offs of PCI loans			5,022	4,817
Gross recoveries			(887)	(1,197)
Net charge-offs			4,135	3,620
Provision for loan losses/lending-related commitments			4,048	3,294
Other			9	1
Ending balance	13,235	13,128	13,235	13,128
Allowance for loan losses/lending-related commitments by impairment methodology
Asset-specific					975		905
Formula-based					11,004		10,399
PCI					1,256		1,824
Total allowance for loan losses/lending-related commitments	13,235	13,128	13,445	13,604	13,235	13,445	13,128
Allowance for lending-related commitments
Allowance for loan losses
Beginning balance			1,055	1,068
Provision for loan losses/lending-related commitments			110	29
Other			0	0
Ending balance	1,165	1,097	1,165	1,097
Allowance for loan losses/lending-related commitments by impairment methodology
Allowance for lending-related commitments by impairment methodology, Asset-specific					135		71
Allowance for lending-related commitments by impairment methodology, Formula-based					1,030		1,026
Total allowance for loan losses/lending-related commitments	1,165	1,097	1,055	1,068	1,165	1,055	1,097
Consumer, excluding credit card
Allowance for loan losses
Gross charge-offs/Write-offs of PCI loans			132	151
Loans by impairment methodology
Asset-specific					6,341		7,046
Formula-based					304,178		343,703
PCI					21,290		25,209
Total retained loans					331,809	373,637	375,958
Lending-related commitments by impairment methodology
Asset-specific					0		0
Formula-based					53,591		50,630
Total lending-related commitments					53,591		50,630
Consumer, excluding credit card \| Impaired collateral-dependent loans
Allowance for loan losses
Net charge-offs			28	15
Impaired collateral-dependent loans
Loans measured at fair value of collateral less cost to sell					2,083		2,077
Consumer, excluding credit card \| Allowance for loan losses
Allowance for loan losses
Beginning balance			4,146	4,579
Gross charge-offs/Write-offs of PCI loans			702	776
Gross recoveries			(420)	(681)
Net charge-offs			282	95
Provision for loan losses/lending-related commitments			(265)	(152)
Other			0	1
Ending balance	3,467	4,182	3,467	4,182
Allowance for loan losses/lending-related commitments by impairment methodology
Asset-specific					145		204
Formula-based					2,066		2,154
PCI					1,256		1,824
Total allowance for loan losses/lending-related commitments	3,467	4,182	4,146	4,579	3,467	4,146	4,182
Consumer, excluding credit card \| Allowance for lending-related commitments
Allowance for loan losses
Beginning balance			33	33
Provision for loan losses/lending-related commitments			0	0
Other			0	0
Ending balance	33	33	33	33
Allowance for loan losses/lending-related commitments by impairment methodology
Allowance for lending-related commitments by impairment methodology, Asset-specific					0		0
Allowance for lending-related commitments by impairment methodology, Formula-based					33		33
Total allowance for loan losses/lending-related commitments	33	33	33	33	33	33	33
Credit card
Allowance for loan losses
Gross charge-offs/Write-offs of PCI loans			0	0
Loans by impairment methodology
Asset-specific					1,423		1,284
Formula-based					158,148		146,572
PCI					0		0
Total retained loans					159,571		147,856
Lending-related commitments by impairment methodology
Asset-specific					0		0
Formula-based					645,880		600,728
Total lending-related commitments					645,880		600,728
Credit card \| Impaired collateral-dependent loans
Allowance for loan losses
Net charge-offs			0	0
Impaired collateral-dependent loans
Loans measured at fair value of collateral less cost to sell					0		0
Credit card \| Allowance for loan losses
Allowance for loan losses
Beginning balance			5,184	4,884
Gross charge-offs/Write-offs of PCI loans			4,050	3,777
Gross recoveries			(433)	(370)
Net charge-offs			3,617	3,407
Provision for loan losses/lending-related commitments			4,017	3,557
Other			(1)	0
Ending balance	5,583	5,034	5,583	5,034
Allowance for loan losses/lending-related commitments by impairment methodology
Asset-specific					488		421
Formula-based					5,095		4,613
PCI					0		0
Total allowance for loan losses/lending-related commitments	5,583	5,034	5,184	4,884	5,583	5,184	5,034
Credit card \| Allowance for lending-related commitments
Allowance for loan losses
Beginning balance			0	0
Provision for loan losses/lending-related commitments			0	0
Other			0	0
Ending balance	0	0	0	0
Allowance for loan losses/lending-related commitments by impairment methodology
Allowance for lending-related commitments by impairment methodology, Asset-specific					0		0
Allowance for lending-related commitments by impairment methodology, Formula-based					0		0
Total allowance for loan losses/lending-related commitments	0	0	0	0	0	0	0
Wholesale
Allowance for loan losses
Gross charge-offs/Write-offs of PCI loans			0	0
Loans by impairment methodology
Asset-specific					1,536		1,051
Formula-based					435,971		422,783
PCI					0		3
Total retained loans					437,507	439,162	423,837
Lending-related commitments by impairment methodology
Asset-specific					446		252
Formula-based					395,173		397,064
Total lending-related commitments					395,619		397,316
Wholesale \| Impaired collateral-dependent loans
Allowance for loan losses
Net charge-offs			23	0
Impaired collateral-dependent loans
Loans measured at fair value of collateral less cost to sell					113		258
Wholesale \| Allowance for loan losses
Allowance for loan losses
Beginning balance			4,115	4,141
Gross charge-offs/Write-offs of PCI loans			270	264
Gross recoveries			(34)	(146)
Net charge-offs			236	118
Provision for loan losses/lending-related commitments			296	(111)
Other			10	0
Ending balance	4,185	3,912	4,185	3,912
Allowance for loan losses/lending-related commitments by impairment methodology
Asset-specific					342		280
Formula-based					3,843		3,632
PCI					0		0
Total allowance for loan losses/lending-related commitments	4,185	3,912	4,115	4,141	4,185	4,115	3,912
Wholesale \| Allowance for lending-related commitments
Allowance for loan losses
Beginning balance			1,022	1,035
Provision for loan losses/lending-related commitments			110	29
Other			0	0
Ending balance	1,132	1,064	1,132	1,064
Allowance for loan losses/lending-related commitments by impairment methodology
Allowance for lending-related commitments by impairment methodology, Asset-specific					135		71
Allowance for lending-related commitments by impairment methodology, Formula-based					997		993
Total allowance for loan losses/lending-related commitments	$ 1,132	$ 1,064	$ 1,022	$ 1,035	$ 1,132	$ 1,022	$ 1,064