Common Stock (Details) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014	Mar. 31, 2014	Mar. 13, 2012
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	9,000,000,000	9,000,000,000
Common stock, par value (in dollars per share)	$ 1	$ 1
Increase (Decrease) in Common Stock Shares
Issued - balance at January 1	4,104,933,895	4,104,933,895	4,104,933,895		4,104,933,895
Total issued - balance at December 31	4,104,933,895	4,104,933,895	4,104,933,895
Increase (Decrease) in Treasury Stock Shares
Treasury - balance at January 1	(348,825,583)				(348,825,583)
Total treasury - balance at December 31	(390,144,630)	(348,825,583)
Outstanding	3,714,800,000	3,756,100,000	3,804,000,000
U.S. Treasury Capital Purchase Program
Exercise price for US Treasury Warrant to purchase shares of the Firm's common stock	$ 42.391			$ 42.42
Common Stock, Dividends, Per Share, Declared	$ 1.58	$ 1.44	$ 1.20
Remaining authorized repurchase amount	$ 3,800,000,000
Approved Repurchase Program Period Start in 2012 [Member]
U.S. Treasury Capital Purchase Program
Stock repurchase program, shares authorized						15,000,000,000
Additional Paid-in Capital
Common Equity Repurchase Program
Aggregate warrant repurchases	(50,000,000)	(24,000,000)	(262,000,000)
Additional Paid-in Capital | JPMorgan Chase & Co.
Common Equity Repurchase Program
Aggregate warrant repurchases	0	0	238,000,000
Common stock
U.S. Treasury Capital Purchase Program
Common Stock, Dividends, Per Share, Declared				$ 0.40	$ 0.38
Common Equity Repurchase Program
Total shares of common stock repurchased	83,400,000	96,100,000	30,900,000
Aggregate common stock repurchases	4,834,000,000	4,789,000,000	1,329,000,000
Common stock capital shares reserved for future issuance	240,000,000
Treasury stock, at cost
Increase (Decrease) in Treasury Stock Shares
Treasury - balance at January 1	(348,800,000)	(300,900,000)	(332,200,000)		(348,800,000)
Purchase of treasury stock	(82,300,000)	(96,100,000)	(33,500,000)
Issued from treasury	41,000,000	48,200,000	65,000,000
Issued from treasury: Employee stock purchase plans	1,200,000	1,100,000	1,300,000
Total treasury - balance at December 31	(390,100,000)	(348,800,000)	(300,900,000)
Common Equity Repurchase Program
Aggregate common stock repurchases	$ 4,760,000,000	$ 4,789,000,000	$ 1,415,000,000
Warrants, each to purchase one share of Common Stock | JPMorgan Chase & Co.
U.S. Treasury Capital Purchase Program
Warrants outstanding	59,759,190	59,800,000	59,800,000
Common Equity Repurchase Program
Total warrants repurchased	0	0	18,500,000
Stock Compensation Plan | Treasury stock, at cost
Increase (Decrease) in Treasury Stock Shares
Purchase of treasury stock	0	0	(200,000)
Issued from treasury	39,800,000	47,100,000	63,700,000