Litigation (Details)	3 Months Ended					3 Months Ended				3 Months Ended							3 Months Ended	1 Months Ended		3 Months Ended								3 Months Ended							12 Months Ended		3 Months Ended				3 Months Ended		3 Months Ended		3 Months Ended				3 Months Ended			1 Months Ended		3 Months Ended
	Mar. 31, 2013 Threatened or Pending Litigation USD ($)	Mar. 31, 2012 Threatened or Pending Litigation USD ($)	Mar. 31, 2013 Threatened or Pending Litigation Maximum USD ($)	Mar. 31, 2013 Threatened or Pending Litigation Minimum USD ($)	Mar. 31, 2013 Auction-Rate Securities Investigations and Litigation [Member] USD ($) actions	Mar. 31, 2013 Bear Stearns Hedge Fund Matters, Related to the Feeder Funds USD ($) actions	Mar. 31, 2013 Bear Stearns Hedge Fund Matters, Feeder Funds, Enhanced Leverage Fund [Member] actions	Mar. 31, 2013 Bear Stearns Hedge Fund Matters, Feeder Funds, Enhanced Leverage Fund [Member] Maximum USD ($)	May 30, 2007 Bear Stearns Hedge Fund Matters [Member] Plaintiff, Bank of America [Member] USD ($)	Mar. 31, 2013 Bear Stearns Hedge Fund Matters [Member] Plaintiff, Bank of America [Member] Maximum USD ($)	Nov. 30, 2012 Bear Stearns Shareholder Litigation and Related Matters [Member] USD ($)	Mar. 31, 2013 CIO Investigations and Litigations ERISA Action [Member] actions	Mar. 31, 2013 CIO Investigations and Litigations Shareholder Derivative Actions Based Upon Alleged Breach of Fiduciary Duty [Member] actions	Mar. 31, 2013 City of Milan Litigation and Criminal Investigation [Member] EUR (€)	Mar. 31, 2010 City of Milan Litigation and Criminal Investigation [Member] employees banks	Mar. 31, 2013 Enron Litigation [Member] actions	Mar. 31, 2013 FERC Investigation [Member]	Nov. 30, 2012 Interchange Litigation [Member]	Mar. 31, 2013 Investment Management Litigation [Member] actions	Mar. 31, 2013 Investment Management Litigation [Member] Minimum USD ($)	Mar. 31, 2013 Lehman Brothers Bankruptcy Proceedings [Member] USD ($)	Mar. 31, 2013 Lehman Brothers Bankruptcy Proceedings [Member] Minimum USD ($)	Mar. 31, 2013 Madoff Litigation [Member] causes	Mar. 31, 2013 Madoff Litigation [Member] Plaintiff, Madoff Litigation-related, liquidation trustee [Member] USD ($)	Mar. 31, 2013 Madoff Litigation, related to Fairfield [Member] USD ($)	Mar. 31, 2013 MF Global [Member] Cash Payment [Member] USD ($)	Mar. 31, 2013 Mortgage-Backed Securities Litigation and Regulatory Investigations [Member] USD ($) actions	Mar. 31, 2013 Mortgage-Backed Securities Litigation and Regulatory Investigations [Member] Minimum	Mar. 31, 2013 Mortgage Backed Securities Litigation Related to MBS Offerings Sponsored By JPMorgan Chase [Member] Maximum trust	Mar. 31, 2013 Mortgage Backed Securities Litigation Related to MBS Offerings Sponsored By JPMorgan Chase [Member] Minimum USD ($)	Mar. 31, 2013 Mortgage Backed Securities Litigation Related to MBS Offerings Sponsored By Washington Mutual [Member] trust	Mar. 31, 2013 Mortgage Backed Securities Litigation Related to MBS Offerings Sponsored By Washington Mutual [Member] Minimum USD ($)	Jan. 07, 2013 Mortgage Foreclosure Investigations and Litigation [Member] Cash Payment [Member] USD ($)	Jan. 07, 2013 Mortgage Foreclosure Investigations and Litigation [Member] Foreclosure Prevention Commitment Actions [Member] USD ($)	Dec. 31, 2012 Municipal Derivatives Investigations and Litigation [Member] plantiffs	Mar. 31, 2013 Municipal Derivatives Investigations and Litigation [Member] Plaintiff, Municipal Derivatives-related, one insurer [Member] Maximum USD ($)	Mar. 31, 2013 Municipal Derivatives Investigations and Litigation [Member] Plaintiff, Municipal Derivatives-related, one insurer [Member] Minimum USD ($)	Mar. 31, 2013 Municipal Derivatives Investigations and Litigation [Member] Plaintiff, Municipal Derivatives-related, the other insurer [Member] USD ($)	Mar. 31, 2013 Municipal Derivatives Investigations and Litigation [Member] Plaintiff, Municipal Derivatives-related, the other insurer [Member] Minimum USD ($)	Dec. 31, 2012 Municipal Derivatives Actions [Member] USD ($)	Sep. 30, 2012 Jefferson County, Alabama [Member] USD ($)	Mar. 31, 2013 Jefferson County, Alabama [Member] Minimum USD ($)	Mar. 31, 2013 Petters Bankruptcy and Related Matters [Member] USD ($)	Mar. 31, 2013 Securities Lending Litigation, related to medium-term notes of Sigma Finance [Member] USD ($)	Mar. 31, 2013 Washington Mutual Litigations [Member] Plaintiff, Deutsche Bank National Trust Company [Member] Maximum USD ($)	Mar. 31, 2013 Washington Mutual Litigations [Member] Plaintiff, Deutsche Bank National Trust Company [Member] Minimum USD ($)	Mar. 31, 2013 Texas Action [Member] USD ($)	Mar. 31, 2013 New York State Supreme Court [Member] CIO Investigations and Litigations Shareholder Derivative Actions Based Upon Alleged Breach of Fiduciary Duty [Member] actions	Mar. 31, 2013 New York State Supreme Court [Member] Mortgage Foreclosure Investigations and Litigation Shareholder Derivative Actions [Member] actions	Mar. 31, 2013 United States District Court, Southern District of New York [Member] CIO Investigations and Litigations Securities Act of 1934 Action [Member] actions	Mar. 31, 2013 New York State Court [Member] Breach of Fiduciary Duty Litigation [Member] actions	Nov. 30, 2012 Interchange Litigation Defendant Group [Member] Interchange Litigation [Member] USD ($)	Jul. 31, 2012 Interchange Litigation Defendant Group [Member] Interchange Litigation [Member]	Mar. 31, 2013 EMC Mortgage LLC [Member] Mortgage Backed Securities Litigation Related to MBS Offerings Sponsored By EMC [Member] offerings actions	Mar. 31, 2013 JPMorgan Chase & Co [Member] MF Global [Member] entities	Mar. 31, 2013 J.P. Morgan Securities LLC [Member] MF Global [Member] entities	Mar. 31, 2013 Purported Class Action [Member] Option Adjustable Rate Mortgage Litigation [Member] actions	Mar. 31, 2013 Certified Class Action [Member] Option Adjustable Rate Mortgage Litigation [Member] actions	Oct. 19, 2012 Subsequent Event New York State Supreme Court [Member] CIO Investigations and Litigations Shareholder Derivative Actions Based Upon Alleged Breach of Fiduciary Duty [Member] actions
Loss Contingency, Estimate [Abstract]
Loss Contingency, Range of Possible Loss, Portion Not Accrued			$ 6,000,000,000	$ 0
Litigation expense (benefit)	347,000,000	2,700,000,000
Loss Contingency Settlement Amount Agreed to Pay by Defendant Group																																																				6,050,000,000
Number of Days the Court Gave the Plaintiff Can File an Amended Complaint																																																	45 days
Loss Contingency, Settlement [Abstract]
Loss Contingency, Settlement Agreement, Consideration, Value					25,000,000			18,000,000			275,000,000															107,500,000							750,000,000	1,200,000,000						43,000,000
Firm's share of settlement agreement, percentage																		20.00%
loss contingency, settlement agreement, consideration, basis points of interchange																																																					0.10%
Period class plaintiffs will receive basis points of interchange																																																				8 months
Number of Plaintiffs That Opted Out of the Settlement																																			27
Loss Contingency, Warrants Issued related to, Value																																										3,000,000,000
Period From The End of the Opt-out Period																		60 days
Loss Contingency, Information about Litigation Matters [Abstract]
Number of Legal Proceedings					2	3	1					2	9			2			3								3																					6	2	4	5			9			1	3
Number of consolidated legal proceedings													2
Number of Offerings by Entity Related to Filed Suit																																																						19
Percentage of Voting Rights, MBS Trust Certificateholders																												25.00%
Number of Asserted Causes of Action Against Entity																							28
Number of Asserted Causes of Action Against Entity That Seek to Avoid Transfers to Entity																							20
Number of Trusts Related to an MBS Securitization																													191		52
Loss Contingency, Damages Sought, Value						700,000,000				540,000,000										1,000,000,000	8,600,000,000			19,000,000,000													400,000,000				1,600,000,000				10,000,000,000	6,000,000,000
Loss Contingency, Insured Aggregate Principal Amount related to, Value																																				1,200,000,000			378,000,000
Loss Contingency, Damages Sought, Recoveries, Value																								425,000,000	155,000,000													4,000,000					450,000,000
Loss Contingency, Damages Sought, Counterclaims, Value																						25,000,000,000
Loss Contingency, Bonds, Value																																															38,000,000
Recommended Fine for Each Bank Involved Proposed by the Prosecutor														1,000,000
Alleged Profit Per Bank The Banks Must Repay As Recommended by the Prosecutor														24,700,000
Loss Contingency, Investments in Medium-Term Notes related to, Value																																												500,000,000
Loss Contingency, Mortgage-Backed Securities Trusts, Original Principal Amount Related To, Value																														174,000,000,000		58,000,000,000
Loss Contingency, Securities Issued by Securitization Trusts related to, Value																											170,000,000,000
Loss Contingency, Securitization related to, Value									$ 4,000,000,000
Number of Actions With Motions to Dismiss																																																											1
Loss Contingency, Number of Defendants																																																							1	1
Period Market-Based Rate Authority Suspended																	6 months
Number of Current and Former JPMorgan Chase and JPMorgan Chase Bank, N.A. Personnel Directed To Go Forward To A Full Trial															4
Number of other banks with personnel ordered to go to a full trial															3
Length of time banned from dealing with Italian public bodies														1 year