Litigation (Details)	1 Months Ended				3 Months Ended		6 Months Ended
	Jul. 31, 2015 USD ($) plantiffs	May. 31, 2015 USD ($)	Jul. 31, 2014 actions plantiffs	May. 31, 2010 USD ($)	Jun. 30, 2015 USD ($) actions entities claims trust investors	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) offerings actions entities claims trust investors defendant municipalities	Jun. 30, 2014 USD ($)	Mar. 31, 2014 actions	Sep. 30, 2013 actions	Mar. 31, 2013 actions	Mar. 31, 2012 employees
CIO Investigations and Litigation
Loss Contingencies [Line Items]
Number of legal proceedings | actions					7		7
Madoff Litigation and Investigations | New York federal and state court
Loss Contingencies [Line Items]
Number of legal proceedings | actions			2		3		3
General Motors Litigation
Loss Contingencies [Line Items]
Number of legal proceedings | actions					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%
Loss contingency, 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 | actions					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
Lehman Brothers Bankruptcy Proceedings | Minimum
Loss Contingencies [Line Items]
Damages sought, counterclaims value (more than)							$ 25,000,000,000
LIBOR and Other Benchmark Rate Investigations and Litigation
Loss Contingencies [Line Items]
Number of legal proceedings | actions					3		3			2	3
Madoff Litigation, related to Fairfield
Loss Contingencies [Line Items]
Number of legal proceedings | actions					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 | actions					5		5
MF Global
Loss Contingencies [Line Items]
Number of defendants out of a group of defendants | defendant							1
Mortgage Backed Securities Litigation and 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					$ 22,800,000,000		$ 22,800,000,000
Amount of original principal balance of MBS involved claims by investors or monoline insurers against JPMC, Bear Stearns or Washington Mutual as issuer					20,700,000,000		20,700,000,000
Amount of original principal balance of MBS involved claims by investors or monoline insurers against JPMC, Bear Stearns or Washington Mutual as underwriter					$ 2,100,000,000		$ 2,100,000,000
Mortgage Backed Securities Litigation and Regulatory Investigations | New York State Court
Loss Contingencies [Line Items]
Claims dismissed | actions							2
Mortgage Backed Securities Litigation Related to MBS Offerings Sponsored By EMC | Monoline Insurer
Loss Contingencies [Line Items]
Number of legal proceedings | actions					2		2
Number of offerings by entity related to filed suit | offerings							11
Mortgage Backed Securities Litigation Related to MBS Offerings Sponsored By EMC | Underwriter actions
Loss Contingencies [Line Items]
Number of legal proceedings | actions					1		1
Mortgage Backed Securities Litigation Related to MBS Offerings Sponsored By Washington Mutual
Loss Contingencies [Line Items]
Number of institutional MBS investors directing or threatening litigation | investors					21		21
Mortgage Backed Securities Litigation Related to MBS Offerings Issued By JPMC and Bear Stearns
Loss Contingencies [Line Items]
Loss contingency, 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 Part or In Whole | 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 | actions					1		1
Number of municipalities pursuing investigations into the impact if any of alleged violations of the FHA and ECOA on their respective communities | municipalities							3
Mortgage-Related Investigations and Litigation | Shareholder Derivative Action | New York State Supreme Court
Loss Contingencies [Line Items]
Number of legal proceedings | actions					1		1
Municipal Derivatives Investigations and 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 | employees												4
Parmalat | Civil Action
Loss Contingencies [Line Items]
Number of legal proceedings | actions					5		5
Parmalat | Claw-back Actions
Loss Contingencies [Line Items]
Number of legal proceedings | actions					2		2
Parmalat | Claims Relating to Derivatives Transactions
Loss Contingencies [Line Items]
Number of legal proceedings | claims					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 | entities					3		3
Number of credit facilities entered into with Polaroid | entities					2		2
Washington Mutual Litigations, not specifically in connection with disputed assets | Plaintiff, Deutsche Bank National Trust Company | Minimum
Loss Contingencies [Line Items]
Damages sought value (more than $1billion)							$ 6,000,000,000
Washington Mutual Litigations, not specifically in connection with disputed assets | Plaintiff, Deutsche Bank National Trust Company | Maximum
Loss Contingencies [Line Items]
Damages sought value (more than $1billion)							10,000,000,000
Threatened or Pending Litigation
Loss Contingencies [Line Items]
Loss contingency, loss in period					$ 291,000,000	$ 669,000,000	978,000,000	$ 707,000,000
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					$ 5,500,000,000		$ 5,500,000,000
Litigation Dismissed | CIO Investigations and Litigation
Loss Contingencies [Line Items]
Number of legal proceedings | actions					6		6
Dismissal affirmed on appeal | CIO Investigations and Litigation
Loss Contingencies [Line Items]
Claims dismissed | claims							1
Appealed dismissals | CIO Investigations and Litigation
Loss Contingencies [Line Items]
Number of legal proceedings | actions					3		3
Not Appealed | Madoff Litigation and Investigations | New York federal and state court
Loss Contingencies [Line Items]
Number of plaintiffs | plantiffs			1
U.S. Department of Justice | Foreign Exchange Investigations and Litigation
Loss Contingencies [Line Items]
Loss contingency, settlement agreement, consideration		$ 550,000,000
Federal Reserve | Foreign Exchange Investigations and Litigation
Loss Contingencies [Line Items]
Loss contingency, settlement agreement, consideration		$ 342,000,000
Total international | Foreign Exchange Investigations and Litigation
Loss Contingencies [Line Items]
Number of legal proceedings | actions									2
Subsequent event | Attorneys General | Sworn Documents, Debt Sales and Collection Litigation Practices [Member]
Loss Contingencies [Line Items]
Number of plaintiffs | plantiffs	47
Loss contingency, settlement agreement, consideration	$ 96,000,000
Investigative Costs, Amount	11,000,000
Subsequent event | Consumer Financial Protection Bureau | Sworn Documents, Debt Sales and Collection Litigation Practices [Member]
Loss Contingencies [Line Items]
Loss contingency, settlement agreement, consideration	30,000,000
Subsequent event | The Office of the Comptroller of the Currency | Sworn Documents, Debt Sales and Collection Litigation Practices [Member]
Loss Contingencies [Line Items]
Loss contingency, settlement agreement, consideration	$ 30,000,000