Loans - By Portfolio Segment (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Loan balances by portfolio segment:
Total retained loans	$ 756,971,000,000	$ 747,508,000,000	$ 721,160,000,000
Held-for-sale	4,924,000,000	7,217,000,000
At fair value	2,290,000,000jpm_LoansReceivableAtFairValue	2,611,000,000jpm_LoansReceivableAtFairValue
Loans	764,185,000,000	757,336,000,000
Loans and leases receivable deferred costs	1,200,000,000	1,300,000,000
Consumer, excluding credit card
Loan balances by portfolio segment:
Total retained loans	304,917,000,000	294,979,000,000	287,930,000,000
Held-for-sale	298,000,000	395,000,000
At fair value	0	0
Loans	305,215,000,000	295,374,000,000
Credit card
Loan balances by portfolio segment:
Total retained loans	120,835,000,000	128,027,000,000	121,512,000,000
Held-for-sale	2,422,000,000	3,021,000,000
At fair value	0	0
Loans	123,257,000,000	131,048,000,000
Wholesale
Loan balances by portfolio segment:
Total retained loans	331,219,000,000	324,502,000,000	311,718,000,000
Held-for-sale	2,204,000,000	3,801,000,000
At fair value	2,290,000,000	2,611,000,000
Loans	$ 335,713,000,000	$ 330,914,000,000

Reflects the amount of cumulative deferred costs.

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- Definition

The aggregate carrying amount of loans receivable that that the entity has elected to carry at fair value. Mortgage loans exclude mortgage-backed securities which are considered a debt security (other loan).

+ References

No definition available.

+ Details

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- Definition

Originated or purchased loans held-for-investment, other than PCI loans, are measured at the principal amount outstanding, net of the following: allowance for loan losses; net charge-offs; interest applied to principal (for loans accounted for on the cost recovery method); unamortized discounts and premiums; and net deferred loan fees or costs.

+ References

No definition available.

+ Details

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- Definition

The aggregate carrying amount of loans receivable that will be sold to other entities, excluding loans that the entity has elected to carry at fair value. Includes mortgage and all other loans (collectively, loans) not classified as held for investment. Such loans are stated at the lower of cost or market. Mortgage loans exclude mortgage-backed securities which are considered a debt security (other loan).

+ References

No definition available.

+ Details

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- 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://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

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