Variable Interest Entities - Municipal Bond Vehicle VIEs (Details 2a) (USD $)								12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2012 JPMorgan Chase & Co Municipal Bonds [Member]	Dec. 31, 2011 JPMorgan Chase & Co Municipal Bonds [Member]	Dec. 31, 2012 Nonconsolidated Municipal Bond Vehicles Municipal Bonds [Member]	Dec. 31, 2011 Nonconsolidated Municipal Bond Vehicles Municipal Bonds [Member]	Dec. 31, 2012 Nonconsolidated Municipal Bond Vehicles Municipal Bonds [Member] Investment Grade AAA to AAA-	Dec. 31, 2011 Nonconsolidated Municipal Bond Vehicles Municipal Bonds [Member] Investment Grade AAA to AAA-	Dec. 31, 2012 Nonconsolidated Municipal Bond Vehicles Municipal Bonds [Member] Investment Grade AAplus to AA-	Dec. 31, 2011 Nonconsolidated Municipal Bond Vehicles Municipal Bonds [Member] Investment Grade AAplus to AA-	Dec. 31, 2012 Nonconsolidated Municipal Bond Vehicles Municipal Bonds [Member] Investment Grade Aplus to A-	Dec. 31, 2011 Nonconsolidated Municipal Bond Vehicles Municipal Bonds [Member] Investment Grade Aplus to A-	Dec. 31, 2012 Nonconsolidated Municipal Bond Vehicles Municipal Bonds [Member] Investment Grade BBB to BBB-	Dec. 31, 2011 Nonconsolidated Municipal Bond Vehicles Municipal Bonds [Member] Investment Grade BBB to BBB-	Dec. 31, 2012 Nonconsolidated Municipal Bond Vehicles Municipal Bonds [Member] Noninvestment-grade	Dec. 31, 2011 Nonconsolidated Municipal Bond Vehicles Municipal Bonds [Member] Noninvestment-grade
Variable Interest Entity [Line Items]
Putable floating-rate certificates of municipal bond vehicles	$ 893,000,000		$ 637,000,000
Firm's exposure to nonconsolidated municipal bond VIEs [Abstract]
Fair value of non-consolidated assets held by VIEs	2,359,141,000,000	[1]	2,265,792,000,000	[1]	2,117,605,000,000			14,200,000,000	13,500,000,000	1,600,000,000	1,500,000,000	11,800,000,000	11,200,000,000	800,000,000	700,000,000	0	0	0	100,000,000
Liquidity facilities provided by Firm serving as liquidity provider								8,000,000,000	7,900,000,000
Excess/ (deficit)								6,200,000,000	5,600,000,000
Maximum exposure						$ 8,000,000,000	$ 7,900,000,000
Weighted average expected life of assets (years)								5 years 10 months 24 days	6 years 7 months 6 days

[1] The following table presents information on assets and liabilities related to VIEs that are consolidated by the Firm at December 31, 2012 and 2011. The difference between total VIE assets and liabilities represents the Firm’s interests in those entities, which were eliminated in consolidation.December 31, (in millions)2012 2011Assets Trading assets$11,966 $12,079Loans82,723 86,754All other assets2,090 2,638Total assets$96,779 $101,471Liabilities Beneficial interests issued by consolidated variable interest entities$63,191 $65,977All other liabilities1,244 1,487Total liabilities$64,435 $67,464The assets of the consolidated VIEs are used to settle the liabilities of those entities. The holders of the beneficial interests do not have recourse to the general credit of JPMorgan Chase. At both December 31, 2012 and 2011, the Firm provided limited program-wide credit enhancement of $3.1 billion related to its Firm-administered multi-seller conduits, which are eliminated in consolidation. For further discussion, see Note 16 on pages 280–291 of this Annual Report.