Parent Company - statements of cash flows (Details2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating activities
Net income	$ 21,284	$ 18,976	$ 17,370
Other, net	(3,613)	6,157	6,234
Net cash provided by/(used in) operating activities	25,079	95,932	(3,752)
Investing activities
Net change in: Deposits with banking subsidiaries	(36,595)	(63,592)	41,625
Available-for-sale securities: Purchases	(189,630)	(202,309)	(179,487)
Available-for-sale securities: Proceeds from sales and maturities	112,633	86,850	92,740
Loans, net	(30,491)	(58,365)	3,022
Net cash (used in)/provided by investing activities	(119,825)	(170,752)	54,002
Financing activities
Net change in other borrowed funds	9,315	7,230	(6,869)
Proceeds from the issuance of long-term debt	86,271	54,844	55,181
Repayments of long-term debt	(96,473)	(82,078)	(99,043)
Excess tax benefits related to stock-based compensation	255	867	26
Redemption of preferred stock	0	0	(352)
Proceeds from issuance of preferred stock	1,234	0	0
Treasury stock and warrants repurchased	(1,653)	(8,863)	(2,999)
Dividends paid	(5,194)	(3,895)	(1,486)
All other financing activities, net	(189)	(1,868)	(1,666)
Net cash provided by/(used in) financing activities	87,707	107,706	(49,217)
Net increase/(decrease) in cash and due from banks	(5,879)	32,035	1,361
Cash and due from banks at the beginning of the period	59,602	27,567	26,206
Cash and due from banks at the end of the period	53,723	59,602	27,567
Cash interest paid	11,161	13,725	12,404
Cash income taxes paid, net	2,050	8,153	9,747
JPMorgan Chase & Co.
Operating activities
Net income	(2,190)	(2,829)	(2,646)
Cash dividends from subsidiaries and affiliates	6,798	13,414	17,432
Other, net	2,401	889	1,685
Net cash provided by/(used in) operating activities	7,009	11,474	16,471
Investing activities
Net change in: Deposits with banking subsidiaries	16,100	20,866	7,692
Available-for-sale securities: Purchases	(364)	(1,109)	(1,387)
Available-for-sale securities: Proceeds from sales and maturities	621	886	745
Loans, net	(350)	153	(90)
Advances to subsidiaries, net	5,951	(28,105)	8,051
Investments (at equity) in subsidiaries and affiliates, net	3,546	(1,530)	(871)
Net cash (used in)/provided by investing activities	25,504	(8,839)	14,140
Financing activities
Net change in borrowings from subsidiaries and affiliates	(14,038)	2,827	(2,039)
Net change in other borrowed funds	3,736	16,268	(11,843)
Proceeds from the issuance of long-term debt	28,172	33,566	21,610
Repayments of long-term debt	(44,240)	(41,747)	(32,893)
Excess tax benefits related to stock-based compensation	255	867	26
Redemption of preferred stock	0	0	(352)
Proceeds from issuance of preferred stock	1,234	0	0
Treasury stock and warrants repurchased	(1,653)	(8,863)	(2,999)
Dividends paid	(5,194)	3,895	(1,486)
All other financing activities, net	(701)	(1,622)	(641)
Net cash provided by/(used in) financing activities	(32,429)	(2,599)	(30,617)
Net increase/(decrease) in cash and due from banks	84	36	(6)
Cash and due from banks at the beginning of the period	132	96	102
Cash and due from banks at the end of the period	216	132	96
Cash interest paid	5,690	5,800	5,090
Cash income taxes paid, net	3,080	5,885	7,001
Subsidiaries [Member] | JPMorgan Chase & Co.
Operating activities
Net income	23,474	21,805	20,016
Subsidiaries and Third Parties [Member] | JPMorgan Chase & Co.
Operating activities
Net income	$ 21,284	$ 18,976	$ 17,370