Litigation (Details)	1 Months Ended				3 Months Ended		9 Months Ended
	Oct. 31, 2015 USD ($)	Jul. 31, 2015 USD ($) plantiffs	May. 31, 2015 USD ($)	May. 31, 2010 USD ($)	Sep. 30, 2015 USD ($) action entity claim investor trust	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) offering transaction action entity claim investor defendant trust municipality	Sep. 30, 2014 USD ($)	Mar. 31, 2014 action	Sep. 30, 2013 action	Mar. 31, 2013 action	Mar. 31, 2012 employee
CIO Investigations and Litigation
Loss Contingencies [Line Items]
Number of legal proceedings | action					7		7
CIO Investigations and Litigation | Litigation Dismissed
Loss Contingencies [Line Items]
Number of legal proceedings | action					6		6
CIO Investigations and Litigation | Appealed Dismissals
Loss Contingencies [Line Items]
Claims dismissed | claim							4
CIO Investigations and Litigation | Dismissal affirmed on appeal
Loss Contingencies [Line Items]
Claims dismissed | claim							1
Madoff Litigation and Investigations | New York federal and state court
Loss Contingencies [Line Items]
Number of legal proceedings | action					3		3
Loss Contingency, Claims Dismissed but on Appeal, Number | action							2
Threatened or Pending Litigation
Loss Contingencies [Line Items]
Firmwide legal expense					$ 1,347,000,000	$ 1,062,000,000	$ 2,325,000,000	$ 1,769,000,000
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					$ 5,000,000,000		$ 5,000,000,000
Foreign Exchange Investigations and Litigation | Total international
Loss Contingencies [Line Items]
Number of legal proceedings | action									2
Foreign Exchange Investigations and Litigation | CANADA
Loss Contingencies [Line Items]
Number of legal proceedings | action					2		2
Foreign Exchange Investigations and Litigation | U.S. Department of Justice
Loss Contingencies [Line Items]
Settlement agreement, consideration			$ 550,000,000
Foreign Exchange Investigations and Litigation | Federal Reserve
Loss Contingencies [Line Items]
Settlement agreement, consideration			$ 342,000,000
General Motors Litigation
Loss Contingencies [Line Items]
Number of legal proceedings | action					2		2
Syndicated term loan facility for General Motors Corporation					$ 1,500,000,000		$ 1,500,000,000
Interchange Litigation
Loss Contingencies [Line Items]
Settlement amount agreed to pay by defendant group							$ 6,100,000,000
Settlement amount consideration percentage							20.00%
Settlement agreement, consideration, basis points of interchange							0.10%
Settlement agreement consideration period class plaintiffs to receive basis points of interchange							8 months
Period from end of the opt-out period							60 days
Investment Management Litigation | Assured Guaranty (U.K.) and Ambac Assurance UK Limited
Loss Contingencies [Line Items]
Number of legal proceedings | action					2		2
Investment Management Litigation | Assured Guaranty (U.K.) and Ambac Assurance UK Limited | Minimum
Loss Contingencies [Line Items]
Damages sought value (more than $1billion)							$ 1,000,000,000
Lehman Brothers Bankruptcy Proceedings
Loss Contingencies [Line Items]
Damages sought value (more than $1billion)				$ 7,900,000,000
Collateral Returned				$ 700,000,000
Lehman Brothers Bankruptcy Proceedings | Minimum
Loss Contingencies [Line Items]
Damages sought, counterclaims value (more than)							25,000,000,000
Lehman Brothers Bankruptcy Proceedings | Claims Relating to Derivatives Transactions
Loss Contingencies [Line Items]
Damages sought, counterclaims value (more than)							$ 1,900,000,000
LIBOR and Other Benchmark Rate Investigations and Litigation
Loss Contingencies [Line Items]
Number of legal proceedings | action					3		3			2	3
LIBOR and Other Benchmark Rate Investigations and Litigation | Alleged Manipulation of Euroven TIBOR and Yen LIBOR | Pending Litigation
Loss Contingencies [Line Items]
Number of defendants | defendant							1
LIBOR and Other Benchmark Rate Investigations and Litigation | Second Claim Related to Euroven TIBOR and Yen LIBOR Alleged Manipulation | Pending Litigation
Loss Contingencies [Line Items]
Number of defendants | defendant							1
LIBOR and Other Benchmark Rate Investigations and Litigation | Interest Rate Benchmark EURIBOR | Pending Litigation
Loss Contingencies [Line Items]
Number of defendants | defendant							1
LIBOR and Other Benchmark Rate Investigations and Litigation | Defendant Banks and ICAP Manipulation of U.S. Dollar ISDAFIX Rates | Pending Litigation
Loss Contingencies [Line Items]
Number of defendants | defendant							1
Madoff Litigation
Loss Contingencies [Line Items]
Number of legal proceedings | action					2		2
Damages sought recoveries value							$ 155,000,000
Breach of Fiduciary Duty Litigation | Madoff Litigation and Investigations | New York State Court
Loss Contingencies [Line Items]
Number of legal proceedings | action					5		5
Mortgage-Backed Securities and Repurchase Litigation and Related Regulatory Investigations
Loss Contingencies [Line Items]
Amount of original principal balance of MBS involved claims by investors or monoline insurers against JPMC, Bear Stearns or Washington Mutual as issuer or as underwriter					$ 13,200,000,000		$ 13,200,000,000
Amount of original principal balance of MBS involved claims by investors or monoline insurers against JPMC, Bear Stearns or Washington Mutual as issuer					11,500,000,000		11,500,000,000
Amount of original principal balance of MBS involved claims by investors or monoline insurers against JPMC, Bear Stearns or Washington Mutual as underwriter					$ 1,700,000,000		$ 1,700,000,000
Mortgage-Backed Securities and Repurchase Litigation and Related Regulatory Investigations | New York State Court
Loss Contingencies [Line Items]
Claims dismissed | action							2
Loss Contingency, Claims Dismissed but on Appeal, Number							1
Mortgage-Backed Securities and Repurchase Litigation and Related Regulatory Investigations | U.S. Department of Justice
Loss Contingencies [Line Items]
Loss Contingency, Parties Investigating, Number | action							2
MBS Litigation Related to MBS Offerings Sponsored By EMC | Monoline Insurer
Loss Contingencies [Line Items]
Number of legal proceedings | action					2		2
Number of offerings by entity related to filed suit | offering							11
MBS Litigation Related to MBS Offerings Sponsored By EMC | Underwriter actions
Loss Contingencies [Line Items]
Number of legal proceedings | action					1		1
MBS Litigation Related to MBS Offerings Sponsored By Washington Mutual
Loss Contingencies [Line Items]
Number of MBS transactions (or more) issued | transaction							1
Number of institutional MBS investors directing or threatening litigation | investor					21		21
MBS Litigation Related to MBS Offerings Issued By JPMC and Bear Stearns
Loss Contingencies [Line Items]
Number of legal proceedings | trust					4		4
Settlement agreement, consideration							$ 4,500,000,000
Number of MBS for which repurchase and servicing claims have been or could have been assumed | trust							330
Number of trustees for the MBS trusts | trust					7		7
Number of MBS trusts for which offer is accepted in whole or in part | trust					319		319
Number of MBS trusts excluded from the settlement in part of in whole | trust					16		16
Mortgage-Related Investigations and Litigation
Loss Contingencies [Line Items]
Number of legal proceedings | action					1		1
Number of municipalities pursuing investigations into the impact if any of alleged violations of the FHA and ECOA on their respective communities | municipality							3
Mortgage-Related Investigations and Litigation | Shareholder Derivative Action | New York State Supreme Court
Loss Contingencies [Line Items]
Number of legal proceedings | action					1		1
Municipal Derivatives Litigation | Minimum
Loss Contingencies [Line Items]
Warrants the firm was chosen to underwrite based upon alleged payments made to certain third parties (more than)							$ 3,000,000,000
Parmalat
Loss Contingencies [Line Items]
Number of former employees intended to be charged with conspiracy | employee												4
Parmalat | Claims Relating to Derivatives Transactions
Loss Contingencies [Line Items]
Number of legal proceedings | claim					2		2
Parmalat | Civil Action
Loss Contingencies [Line Items]
Number of legal proceedings | action					5		5
Parmalat | Claw-back Actions
Loss Contingencies [Line Items]
Number of legal proceedings | action					2		2
Petters Bankruptcy and Related Matters
Loss Contingencies [Line Items]
Damages sought recoveries value							$ 450,000,000
Number of entities whose trustee in bankruptcy brought actions against JPMorgan Chase | entity					3		3
Number of credit facilities entered into with Polaroid | entity					2		2
Sworn Documents, Debt Sales and Collection Litigation Practices | Attorneys General
Loss Contingencies [Line Items]
Settlement agreement, consideration		$ 96,000,000
Number of plaintiffs | plantiffs		47
Investigative costs		$ 11,000,000
Sworn Documents, Debt Sales and Collection Litigation Practices | Attorneys General | Subsequent Event
Loss Contingencies [Line Items]
Settlement agreement, consideration	$ 50,000,000
Sworn Documents, Debt Sales and Collection Litigation Practices | Consumer Financial Protection Bureau
Loss Contingencies [Line Items]
Settlement agreement, consideration		30,000,000
Sworn Documents, Debt Sales and Collection Litigation Practices | The Office of the Comptroller of the Currency
Loss Contingencies [Line Items]
Settlement agreement, consideration		$ 30,000,000
Washington Mutual Litigations | Minimum | Plaintiff, Deutsche Bank National Trust Company
Loss Contingencies [Line Items]
Damages sought value (more than $1billion)							$ 6,000,000,000
Washington Mutual Litigations | Maximum | Plaintiff, Deutsche Bank National Trust Company
Loss Contingencies [Line Items]
Damages sought value (more than $1billion)							$ 10,000,000,000