Variable Interest Entities - Interest in Securitized Assets Held at Fair Value (Details 6) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Key economic assumptions used to determine the fair value of certain of the Firm's retained interests, other than MSRs [Abstract]
Changes In Fair Value Based On Variation In Assumptions Limit First	10.00%	20.00%
Variable Interest Entity, Not Primary Beneficiary [Member] | Commercial Mortgage Backed Securities [Member]
Key economic assumptions used to determine the fair value of certain of the Firm's retained interests, other than MSRs [Abstract]
JPMorgan Chase interests in securitized assets	1,488	1,585
Weighted-average life (in years)	6 years 1 month 6 days	1 year
Discount Rate and Expected Credit Loss Assumptions Used to Determine FV of Interests Continued to be Held by Transferor	4.10%	59.10%
Impact of 10% adverse change	(34)	(45)
Impact of 20% adverse change	(65)	(76)
Variable Interest Entity, Not Primary Beneficiary [Member] | Prime [Member]
Key economic assumptions used to determine the fair value of certain of the Firm's retained interests, other than MSRs [Abstract]
JPMorgan Chase interests in securitized assets	341	555
Variable Interest Entity, Not Primary Beneficiary [Member] | Subprime [Member]
Key economic assumptions used to determine the fair value of certain of the Firm's retained interests, other than MSRs [Abstract]
JPMorgan Chase interests in securitized assets	68	31
Variable Interest Entity, Not Primary Beneficiary [Member] | Option Arms
Key economic assumptions used to determine the fair value of certain of the Firm's retained interests, other than MSRs [Abstract]
JPMorgan Chase interests in securitized assets		23