Litigation (Details) € in Millions	1 Months Ended								3 Months Ended		9 Months Ended		12 Months Ended		36 Months Ended
	Sep. 30, 2021 EUR (€)	Aug. 31, 2021 USD ($)	Oct. 31, 2020 claim	May 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Nov. 30, 2017 USD ($)	Jan. 31, 2017	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) claim count	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) defendant	Dec. 31, 2012 USD ($) action	Dec. 31, 2013 USD ($)	Dec. 31, 2012 fund
Loss Contingencies [Line Items]
Legal expense									$ 76,000,000	$ 524,000,000	$ 289,000,000	$ 839,000,000
Threatened or Pending Litigation | Minimum
Loss Contingencies [Line Items]
Loss contingency range of possible loss									0		0
Threatened or Pending Litigation | Maximum
Loss Contingencies [Line Items]
Loss contingency range of possible loss									$ 1,500,000,000		1,500,000,000
Amrapali Litigation | JPMorgan India Private Limited
Loss Contingencies [Line Items]
Number of offshore funds formerly managed by JPMorgan Chase entities | fund																2
Amount of claim		$ 31,500,000		$ 25,000,000
Federal Republic of Nigeria Litigation | Federal Government of Nigeria and Two Major International Oil Companies
Loss Contingencies [Line Items]
Amount paid out of monies in account following settlement of dispute															$ 1,100,000,000
Federal Republic of Nigeria Litigation | Federal Republic of Nigeria
Loss Contingencies [Line Items]
Amount of claim							$ 875,000,000
Foreign Exchange Investigations and Litigation
Loss Contingencies [Line Items]
Loss contingency, exemption of disqualification period								5 years
Loss contingency disqualification period								10 years
Number of other defendants that agreed in principle to settle class action | defendant													11
Settlement amount													$ 10,000,000
Interchange Litigation
Loss Contingencies [Line Items]
Number of claims settled | action														2
Interchange Litigation | The Defendants
Loss Contingencies [Line Items]
Settlement amount						$ 900,000,000								$ 5,300,000,000
Payments for legal settlement					$ 700,000,000
Metals and U.S. Treasuries Investigations and Litigation and Related Inquiries
Loss Contingencies [Line Items]
Settlement amount											$ 920,000,000
Number of claims settled | claim											3
Number of counts of wire fraud charged | count											2
Period after which criminal information will be dismissed with full compliance with all obligations											3 years
Number of claims filed | claim			2
Wendel Litigation | JPMorgan Chase Bank, N.A.
Loss Contingencies [Line Items]
Payments for legal settlement | €	€ 25