Litigation (Details)	12 Months Ended							12 Months Ended								12 Months Ended	1 Months Ended		12 Months Ended							12 Months Ended						3 Months Ended		12 Months Ended		12 Months Ended				12 Months Ended		12 Months Ended										12 Months Ended		1 Months Ended	12 Months Ended					12 Months Ended			3 Months Ended
	Dec. 31, 2012 Threatened or Pending Litigation [Member] USD ($)	Dec. 31, 2011 Threatened or Pending Litigation [Member] USD ($)	Dec. 31, 2010 Threatened or Pending Litigation [Member] USD ($)	Dec. 31, 2012 Threatened or Pending Litigation [Member] Maximum [Member] USD ($)	Dec. 31, 2012 Threatened or Pending Litigation [Member] Minimum [Member] USD ($)	Dec. 31, 2012 Auction-Rate Securities Investigations and Litigation [Member] USD ($) actions	May 30, 2007 Bear Stearns Hedge Fund Matters [Member] Plaintiff, Bank of America [Member] USD ($)	Dec. 31, 2012 Bear Stearns Hedge Fund Matters [Member] Plaintiff, Bank of America [Member] Maximum [Member] USD ($)	Dec. 31, 2012 Bear Stearns Hedge Fund Matters, Related to the Feeder Funds USD ($) actions	Dec. 31, 2012 Bear Stearns Hedge Fund Matters, Feeder Funds, Enhanced Leverage Fund [Member] actions	Dec. 31, 2012 Bear Stearns Hedge Fund Matters, Feeder Funds, Enhanced Leverage Fund [Member] Maximum [Member] USD ($)	Dec. 31, 2012 Bear Stearns Shareholder Litigation and Related Matters [Member] USD ($)	Dec. 31, 2012 City of Milan Litigation and Criminal Investigation [Member] EUR (€) employees	Mar. 31, 2010 City of Milan Litigation and Criminal Investigation [Member] employees	Dec. 31, 2012 Enron Litigation [Member] actions	Dec. 31, 2012 FERC Investigation [Member]	Nov. 30, 2012 Interchange Litigation [Member]	Dec. 31, 2012 Investment Management Litigation [Member] actions	Dec. 31, 2012 Investment Management Litigation [Member] Minimum [Member] USD ($)	Dec. 31, 2012 Lehman Brothers Bankruptcy Proceedings [Member] USD ($)	Dec. 31, 2012 Lehman Brothers Bankruptcy Proceedings [Member] Minimum [Member] USD ($)	Dec. 31, 2012 Madoff Litigation [Member] causes	Dec. 31, 2012 Madoff Litigation [Member] Plaintiff, Madoff Litigation-related, liqudation trustee [Member] USD ($)	Dec. 31, 2012 Madoff Litigation, related to Fairfield [Member] USD ($)	Dec. 31, 2012 Mortgage-Backed Securities Litigation and Regulatory Investigations [Member] USD ($) actions	Dec. 31, 2012 Mortgage-Backed Securities Litigation and Regulatory Investigations [Member] Minimum [Member]	Dec. 31, 2012 Mortgage Backed Securities Litigation Related to MBS Offerings Sponsored By Washington Mutual [Member] trust	Dec. 31, 2012 Mortgage Backed Securities Litigation Related to MBS Offerings Sponsored By Washington Mutual [Member] Minimum [Member] USD ($)	Dec. 31, 2012 Mortgage Backed Securities Litigation Related to MBS Offerings Sponsored By JPMorgan Chase [Member] Maximum [Member] trust	Dec. 31, 2012 Mortgage Backed Securities Litigation Related to MBS Offerings Sponsored By JPMorgan Chase [Member] Minimum [Member] USD ($)	Dec. 31, 2012 Mortgage Foreclosure Investigations and Litigation [Member] actions	Sep. 30, 2012 Jefferson County, Alabama [Member] USD ($)	Dec. 31, 2012 Jefferson County, Alabama [Member] Minimum [Member] USD ($)	Dec. 31, 2012 Municipal Derivatives Investigations and Litigation [Member] USD ($) entities	Dec. 31, 2012 Municipal Derivatives Investigations and Litigation [Member] Plaintiff, Municipal Derivatives-related, one insurer [Member] Maximum [Member] USD ($)	Dec. 31, 2012 Municipal Derivatives Investigations and Litigation [Member] Plaintiff, Municipal Derivatives-related, one insurer [Member] Minimum [Member] USD ($)	Dec. 31, 2011 Municipal Derivatives Investigations and Litigation [Member] Plaintiff, Municipal Derivatives-related, the other insurer [Member] USD ($)	Dec. 31, 2012 Municipal Derivatives Investigations and Litigation [Member] Plaintiff, Municipal Derivatives-related, the other insurer [Member] Minimum [Member] USD ($)	Dec. 31, 2012 Overdraft Fee/Debit Posting Order Litigation [Member] USD ($)	Dec. 31, 2012 Petters Bankruptcy and Related Matters [Member] USD ($)	Dec. 31, 2012 Securities Lending Litigation, related to medium-term notes of Lehman Brothers [Member] USD ($)	Dec. 31, 2012 Washington Mutual Litigations [Member] Plaintiff, Deutsche Bank National Trust Company [Member] Maximum [Member] USD ($)	Dec. 31, 2012 Washington Mutual Litigations [Member] Plaintiff, Deutsche Bank National Trust Company [Member] Minimum [Member] USD ($)	Dec. 31, 2012 Washington Mutual Litigations Texas Action [Member] USD ($)	Dec. 31, 2012 CIO Investigations and Litigations ERISA Action [Member] actions	Dec. 31, 2012 CIO Investigations and Litigations Shareholder Derivative Actions Based Upon Alleged Breach of Fiduciary Duty [Member] actions	Dec. 31, 2012 Mortgage Foreclosure Investigations and Litigation Actions Dismissed [Member] actions	Dec. 31, 2012 Mortgage Foreclosure Investigations and Litigation Actions Settled on an Individual Basis [Member] actions	Dec. 31, 2012 United States District Court, Southern District of New York [Member] CIO Investigations and Litigations Securities Act of 1934 Actions [Member] actions	Dec. 31, 2012 New York State Supreme Court [Member] CIO Investigations and Litigations Shareholder Derivative Actions Based Upon Alleged Breach of Fiduciary Duty [Member] actions	Oct. 19, 2012 New York State Supreme Court [Member] CIO Investigations and Litigations Shareholder Derivative Actions Based Upon Alleged Breach of Fiduciary Duty [Member] actions	Dec. 31, 2012 New York State Supreme Court [Member] Mortgage Foreclosure Investigations and Litigation Shareholder Derivative Actions [Member] actions	Dec. 31, 2012 New York State Court [Member] Breach of Fiduciary Duty Litigation [Member] actions	Nov. 30, 2012 Interchange Litigation Defendant Group [Member] Interchange Litigation [Member] USD ($)	Dec. 31, 2012 JPMorgan Chase & Co [Member] MF Global [Member] entities	Dec. 31, 2012 J.P. Morgan Securities LLC [Member] MF Global [Member] entities	Dec. 31, 2012 EMC Mortgage LLC [Member] Mortgage Backed Securities Litigation Related to MBS Offerings Sponsored By EMC [Member] offerings actions	Dec. 31, 2012 Actions Transferred [Member] LIBOR Investigations and Litigation [Member] actions	Dec. 31, 2012 Certified Class Action [Member] Option Adjustable Rate Mortgage Litigation [Member] actions	Dec. 31, 2012 Class Action [Member] LIBOR Investigations and Litigation [Member] actions	Dec. 31, 2012 Individual Action [Member] LIBOR Investigations and Litigation [Member] actions	Dec. 31, 2012 Purported Class Action [Member] Option Adjustable Rate Mortgage Litigation [Member] actions	Dec. 31, 2012 Subsequent Event [Member] Mortgage Foreclosure Investigations and Litigation [Member] USD ($)	Jan. 07, 2013 Subsequent Event [Member] Mortgage Foreclosure Investigations and Litigation [Member] Cash Payment [Member] USD ($)	Jan. 07, 2013 Subsequent Event [Member] Mortgage Foreclosure Investigations and Litigation [Member] Foreclosure Prevention Commitment Actions [Member] USD ($)
Loss Contingencies [Line Items]
loss contingency, settlement agreement, consideration, basis points of interchange																																																						0.10%
Loss Contingency, Estimate [Abstract]
Loss Contingency, Range of Possible Loss, Portion Not Accrued				$ 6,100,000,000	$ 0
Litigation expense (benefit)	5,000,000,000	4,900,000,000	7,400,000,000																																																												700,000,000
Loss Contingency, Settlement Agreement, Consideration						25,000,000					18,000,000	275,000,000													296,900,000									43,000,000					110,000,000																									753,000,000	1,200,000,000
Number of Plaintiffs That Opted Out of the Settlement																																		27
Loss Contingency, Warrants Issued related to, Value																																	3,000,000,000
Number of NASAA's Members With Which Settlement Agreements Have Not Been Finalized						3
Loss Contingency, Information about Litigation Matters [Abstract]
Number of Legal Proceedings						2			3	1					2			3							3						6														2	4	2	1	4	2		2	5				9	3	3	3	3	1
Loss Contingency, Number of Defendants																																																							1	1
Loss Contingency, Securities Issued by Securitization Trusts related to, Value																									170,000,000,000
Number of Days After the Filing of Amended Complaint the Defendents Have to Respond																																																												60 days
Number Of Legal Proceedings In Which An Amended Complaint Was Filed																																														1
Number of consolidated legal proceedings																																														2
Number of Offerings by Entity Related to Filed Suit																																																									19
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																											52		191
Percentage of Voting Rights, MBS Trust Certificateholders																										25.00%
Loss Contingency, Damages Sought, Value								540,000,000	700,000,000										1,000,000,000	8,600,000,000			19,000,000,000									1,600,000,000				400,000,000						10,000,000,000	6,000,000,000
Loss Contingency, Securitization related to, Value							4,000,000,000
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, Information about related Resources or Markets [Abstract]
Loss Contingency, Insured Aggregate Principal Amount related to, Value																																			1,200,000,000			378,000,000
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																												58,000,000,000		174,000,000,000
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
Number of personnel acquitted													2
Number of personnel found guilty													2
Length of time banned from dealing with Italian public bodies													1 year
Loss Contingency, Bonds, Face (or Par) Value																																												38,000,000
Number of Days the Court Gave the Plaintiff to File an Amended Complaint																																																				45 days
Number of Actions With Motions to Dismiss																																																			1
Fine Levied by the Court													1,000,000
Forfeited Profit from the Transaction													24,700,000
Loss Contingency Settlement Amount Agreed to Pay by Defendant Group																																																						$ 6,050,000,000
Loss Contingency, Settlement Agreement, Consideration, Percentage																	20.00%
Loss Contingency, Settlement Agreement, Consideration, Period Class Plaintiffs to Receive Basis Points of Interchange																																																						8 months
Period From The End of the Opt-out Period																	60 days