Derivative Instruments - Impact on Balance Sheet (Details 1a) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Impact of derivatives on the Consolidated Balance Sheets [Abstract]
Fair value related to derivative receivables	$ 2,039,309,000,000	$ 1,529,412,000,000
Derivative receivables netting adjustment	(1,930,456,000,000)	(1,448,931,000,000)
Fair value related to derivative payables	1,972,348,000,000	1,485,109,000,000
Derivative payables netting adjustment	(1,893,099,000,000)	(1,415,890,000,000)
Carrying value of derivative trading assets	108,853,000,000	80,481,000,000
Carrying value of derivative trading liabilities	79,249,000,000	69,219,000,000
Trading assets
Impact of derivatives on the Consolidated Balance Sheets [Abstract]
Carrying value of derivative trading assets	108,853,000,000	80,481,000,000
Trading liabilities
Impact of derivatives on the Consolidated Balance Sheets [Abstract]
Carrying value of derivative trading liabilities	79,249,000,000	69,219,000,000
Other borrowed funds \| Designated as Hedging Instrument [Member]
Derivatives Excluded From Trading Assets and Trading Liabilities [Abstract]
Commodity derivatives used as fair value hedging instruments		1,000,000,000
Not Designated as Hedging Instrument [Member]
Impact of derivatives on the Consolidated Balance Sheets [Abstract]
Fair value related to derivative receivables	2,021,477,000,000	1,519,878,000,000
Fair value related to derivative payables	1,968,588,000,000	1,481,132,000,000
Foreign exchange \| Not Designated as Hedging Instrument [Member]
Impact of derivatives on the Consolidated Balance Sheets [Abstract]
Fair value related to derivative receivables	217,407,000,000	165,240,000,000
Fair value related to derivative payables	213,080,000,000	163,671,000,000
Equity \| Not Designated as Hedging Instrument [Member]
Impact of derivatives on the Consolidated Balance Sheets [Abstract]
Fair value related to derivative receivables	64,487,000,000	43,633,000,000
Fair value related to derivative payables	56,692,000,000	46,399,000,000
Credit derivatives \| Not Designated as Hedging Instrument [Member]
Impact of derivatives on the Consolidated Balance Sheets [Abstract]
Fair value related to derivative receivables	196,519,000,000	129,729,000,000
Fair value related to derivative payables	191,300,000,000	125,061,000,000
Commodity \| Not Designated as Hedging Instrument [Member]
Impact of derivatives on the Consolidated Balance Sheets [Abstract]
Fair value related to derivative receivables	63,567,000,000	59,573,000,000
Fair value related to derivative payables	67,101,000,000	56,397,000,000
Interest rate contract \| Not Designated as Hedging Instrument [Member]
Impact of derivatives on the Consolidated Balance Sheets [Abstract]
Fair value related to derivative receivables	1,479,497,000,000	1,121,703,000,000
Fair value related to derivative payables	1,440,415,000,000	1,089,604,000,000
Designated as Hedging Instrument [Member]
Impact of derivatives on the Consolidated Balance Sheets [Abstract]
Fair value related to derivative receivables	17,832,000,000	9,534,000,000
Fair value related to derivative payables	3,760,000,000	3,977,000,000
Designated as Hedging Instrument [Member] \| Foreign currency-denominated debt [Member]
Derivatives Excluded From Trading Assets and Trading Liabilities [Abstract]
Foreign currency-denominated debt	13,000,000	21,000,000
Foreign exchange \| Designated as Hedging Instrument [Member]
Impact of derivatives on the Consolidated Balance Sheets [Abstract]
Fair value related to derivative receivables	6,897,000,000	3,231,000,000
Fair value related to derivative payables	302,000,000	1,059,000,000
Equity \| Designated as Hedging Instrument [Member]
Impact of derivatives on the Consolidated Balance Sheets [Abstract]
Fair value related to derivative receivables	0	0
Fair value related to derivative payables	0	0
Credit derivatives \| Designated as Hedging Instrument [Member]
Impact of derivatives on the Consolidated Balance Sheets [Abstract]
Fair value related to derivative receivables	0	0
Fair value related to derivative payables	0	0
Commodity \| Designated as Hedging Instrument [Member]
Impact of derivatives on the Consolidated Balance Sheets [Abstract]
Fair value related to derivative receivables	3,276,000,000	24,000,000
Fair value related to derivative payables	1,243,000,000	2,078,000,000
Interest rate contract \| Designated as Hedging Instrument [Member]
Impact of derivatives on the Consolidated Balance Sheets [Abstract]
Fair value related to derivative receivables	7,659,000,000	6,279,000,000
Fair value related to derivative payables	2,215,000,000	840,000,000
Interest rate contract
Impact of derivatives on the Consolidated Balance Sheets [Abstract]
Fair value related to derivative receivables	1,487,156,000,000	1,127,982,000,000
Fair value related to derivative payables	1,442,630,000,000	1,090,444,000,000
Carrying value of derivative trading assets	50,648,000,000	32,555,000,000
Carrying value of derivative trading liabilities	25,367,000,000	20,387,000,000
Credit derivatives
Impact of derivatives on the Consolidated Balance Sheets [Abstract]
Fair value related to derivative receivables	196,519,000,000	129,729,000,000
Fair value related to derivative payables	191,300,000,000	125,061,000,000
Carrying value of derivative trading assets	7,033,000,000	7,725,000,000
Carrying value of derivative trading liabilities	6,215,000,000	5,138,000,000
Foreign exchange
Impact of derivatives on the Consolidated Balance Sheets [Abstract]
Fair value related to derivative receivables	224,304,000,000	168,471,000,000
Fair value related to derivative payables	213,382,000,000	164,730,000,000
Carrying value of derivative trading assets	25,887,000,000	25,858,000,000
Carrying value of derivative trading liabilities	22,217,000,000	25,015,000,000
Equity
Impact of derivatives on the Consolidated Balance Sheets [Abstract]
Fair value related to derivative receivables	64,487,000,000	43,633,000,000
Fair value related to derivative payables	56,692,000,000	46,399,000,000
Carrying value of derivative trading assets	8,504,000,000	4,204,000,000
Carrying value of derivative trading liabilities	9,186,000,000	10,450,000,000
Commodity
Impact of derivatives on the Consolidated Balance Sheets [Abstract]
Fair value related to derivative receivables	66,843,000,000	59,597,000,000
Fair value related to derivative payables	68,344,000,000	58,475,000,000
Carrying value of derivative trading assets	16,781,000,000	10,139,000,000
Carrying value of derivative trading liabilities	$ 16,264,000,000	$ 8,229,000,000

The total amount of netting of derivative payables combining the offsetting netting adjustment with the related cash collateral received when a legally enforceable master netting agreement exists.

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

- Definition

The total amount of netting of derivative receivables combining the offsetting netting adjustment with the related cash collateral received when a legally enforceable master netting agreement exists.

+ Details

Name:	jpm_DerivativeReceivablesNettingAdjustmentTotal
Namespace Prefix:	jpm
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Derivatives Excluded From Trading Assets and Trading Liabilities [Abstract]

+ Details

Name:	jpm_DerivativesExcludedFromTradingAssetsAndTradingLiabilitiesAbstract
Namespace Prefix:	jpm
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value hedging instrument related to commodity derivatives.

+ Details

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

- Definition

Free standing derivatives.

+ Details

Name:	jpm_FreeStandingDerivativesAbstract
Namespace Prefix:	jpm
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Net Investment Hedge Derivative Liabilities At Fair Value, Excluded From Derivative Fair Value of Derivative Net

+ Details

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

- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13495-108611

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FIN39-1

-Paragraph 10A, 10B

-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.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 4, 17

-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.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

+ Details

Name:	us-gaap_DerivativeAssets
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph a

-Clause 1

-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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-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_DerivativeFairValueOfDerivativeAsset
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

+ Details

Name:	us-gaap_DerivativeFairValueOfDerivativeLiability
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References

+ Details

Name:	us-gaap_DerivativeLiabilities
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant