Litigation (Details)	1 Months Ended				3 Months Ended		9 Months Ended		36 Months Ended	85 Months Ended
	Aug. 31, 2025 USD ($)	Aug. 31, 2021 USD ($)	May 31, 2021 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2012 fund	Sep. 30, 2025 USD ($)
Loss Contingencies [Line Items]
Legal expense					$ 62,000,000	$ 259,000,000	$ 301,000,000	$ 504,000,000
Threatened or Pending Litigation | Minimum
Loss Contingencies [Line Items]
Loss contingency range of possible loss					0		0			$ 0
Threatened or Pending Litigation | Maximum
Loss Contingencies [Line Items]
Loss contingency range of possible loss					$ 1,200,000,000		$ 1,200,000,000			1,200,000,000
1MDB Litigation
Loss Contingencies [Line Items]
Payments for legal settlement	$ 330,000,000
1MDB Litigation, 2009 | J.P. Morgan (Suisse) SA
Loss Contingencies [Line Items]
Amount of claim			$ 300,000,000
1MDB Litigation, 2010 | J.P. Morgan (Suisse) SA
Loss Contingencies [Line Items]
Amount of claim			$ 500,000,000
1MDB Litigation, PetroSaudi Joint Venture | J.P. Morgan (Suisse) SA
Loss Contingencies [Line Items]
Payments for legal settlement	$ 3,800,000
Amrapali Litigation | JPMorgan India Private Limited
Loss Contingencies [Line Items]
Amount of claim		$ 31,500,000
Number of offshore funds formerly managed by JPMorgan Chase entities | fund									2
Foreign Exchange Investigations and Litigation
Loss Contingencies [Line Items]
Loss contingency disqualification period							10 years
Interchange Litigation | The Defendants
Loss Contingencies [Line Items]
Payments for legal settlement										$ 700,000,000
Settlement amount				$ 6,200,000,000
Settlements with merchants who opted out, percentage of combined card sales volume (over)					80.00%		80.00%			80.00%
Russian Litigation
Loss Contingencies [Line Items]
Amount of claim							$ 439,000,000