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, 2020	Dec. 31, 2019	Dec. 31, 2018
JPMorgan Chase Financial Company LLC
Other off-balance sheet arrangements - supplemental information [Abstract]
Direct-owned and consolidated finance subsidiary ownership	100.00%
Merchant Services
Other off-balance sheet arrangements - supplemental information [Abstract]
Carrying value of valuation allowance that covers payment or performance risk related to charge-backs	$ 12	$ 11
Aggregate volume processed by electronic payment services business	$ 1,597,300	$ 1,511,500	$ 1,366,100