Litigation (Details)	1 Months Ended					3 Months Ended		12 Months Ended		36 Months Ended
	May 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Nov. 30, 2017 USD ($)	Jan. 31, 2017	Mar. 31, 2021 USD ($) count claim	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) defendant	Dec. 31, 2012 USD ($) action	Dec. 31, 2013 USD ($)	Dec. 31, 2012 fund
Loss Contingencies [Line Items]
Legal expense						$ 28,000,000	$ 197,000,000
Threatened or Pending Litigation | Minimum
Loss Contingencies [Line Items]
Loss contingency range of possible loss						0
Threatened or Pending Litigation | Maximum
Loss Contingencies [Line Items]
Loss contingency range of possible loss						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	$ 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