Off-balance Sheet Lending-related Financial Instruments, Guarantees, and Other Commitments - Other Off-Balance Sheet Arrangements (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other off-balance sheet arrangements - supplemental information [Abstract]
Aggregate losses incurred	$ 5,731	$ 6,079	$ 5,555
JPMorgan Chase Financial Company LLC
Other off-balance sheet arrangements - supplemental information [Abstract]
Direct-owned finance subsidiary ownership	100.00%
Merchant Services
Other off-balance sheet arrangements - supplemental information [Abstract]
Aggregate losses incurred	$ 30	28	85
Aggregate volume processed by electronic payment services business	1,366,100	1,191,700	$ 1,063,400
Carrying value of valuation allowance	23	7
Cash collateral held	$ 144	$ 141

Aggregate volume processed by electronic payment services business.

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Carrying amount as of the balance sheet date of cash collateral held.

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

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Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
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-Section 50
-Paragraph 3
-Subparagraph (b)
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Amount of noninterest expense classified as other.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of valuation and qualifying accounts and reserves.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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