Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share, Basic, Two Class Method [Abstract]
Net income	$ 5,914us-gaap_NetIncomeLoss	$ 5,269us-gaap_NetIncomeLoss
Less: Preferred stock dividends	324us-gaap_DividendsPreferredStock	227us-gaap_DividendsPreferredStock
Net income applicable to common equity	5,590jpm_NetIncomeApplicableToCommonEquity	5,042jpm_NetIncomeApplicableToCommonEquity
Less: Dividends and undistributed earnings allocated to participating securities	138	149
Net income applicable to common stockholders	5,452	4,893
Weighted-average basic shares (in shares)	3,725.3	3,787.2
Basic earnings per share (in dollars per share)	$ 1.46us-gaap_EarningsPerShareBasic	$ 1.29us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted, Two Class Method [Abstract]
Net income applicable to common stockholders	$ 5,452	$ 4,893
Weighted-average basic shares (in shares)	3,725.3	3,787.2
Add: Employee stock options, SARs and warrants (in shares)	32.2	36.4
Total weighted-average diluted shares (in shares)	3,757.5	3,823.6
Diluted earnings per share (in dollars per share)	$ 1.45us-gaap_EarningsPerShareDiluted	$ 1.28us-gaap_EarningsPerShareDiluted
Earnings Per Share, Diluted, Other Disclosures [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	1	1

Net income applicable to common equity before adjustments for participating securities.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Amount of earnings (loss) distributed and earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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