Parent Company - Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities
Net income	$ 32,474	$ 24,441	$ 24,733
Other operating adjustments	295	7,803	(1,827)
Net cash provided by/(used in) operating activities	14,187	(10,827)	21,884
Investing activities
Proceeds from paydowns and maturities from available-for-sale securities Securities	37,401	56,117	65,950
All other investing activities, net	(4,986)	(563)	(2,825)
Net cash provided by/(used in) investing activities	(197,993)	28,249	(89,202)
Financing activities
Net change in: Short-term borrowings			(2,461)
Short-term borrowings	18,476	16,540
Proceeds from long-term borrowings	71,662	56,271	83,070
Payments of long-term borrowings	(76,313)	(83,079)	(68,949)
Proceeds from issuance of preferred stock	1,696	1,258	0
Redemption of preferred stock	(1,696)	(1,258)	0
Treasury stock repurchased	(19,983)	(15,410)	(9,082)
Dividends paid	(10,109)	(8,993)	(8,476)
All other financing activities, net	(1,430)	407	(467)
Net cash provided by financing activities	34,158	14,642	98,271
Net increase/(decrease) in cash and due from banks and deposits with banks	(152,511)	40,150	29,471
Cash and due from banks and deposits with banks at the beginning of the period	431,304	391,154	361,683
Cash and due from banks and deposits with banks at the end of the period	278,793	431,304	391,154
Cash interest paid	21,152	14,153	9,508
Cash income taxes paid, net	3,542	4,325	2,405
JPMorgan Chase & Co.
Operating activities
Net income	32,474	24,441	24,733
Less: Net income of subsidiaries and affiliates	38,125	26,185	27,846
Parent company net loss	(5,651)	(1,744)	(3,113)
Cash dividends from subsidiaries and affiliates	32,501	13,540	13,873
Other operating adjustments	(4,400)	4,635	(18,166)
Net cash provided by/(used in) operating activities	22,450	16,431	(7,406)
Investing activities
Proceeds from paydowns and maturities from available-for-sale securities Securities	0	0	353
Other changes in loans, net	0	78	1,793
Advances to and investments in subsidiaries and affiliates, net	8,036	(280)	(51,967)
All other investing activities, net	63	49	114
Net cash provided by/(used in) investing activities	8,099	(153)	(49,707)
Financing activities
Net change in: Borrowings from subsidiaries and affiliates	(2,273)	13,862	2,957
Net change in: Short-term borrowings	(678)	(481)
Short-term borrowings			109
Proceeds from long-term borrowings	25,845	25,855	41,498
Payments of long-term borrowings	(21,956)	(29,812)	(29,298)
Proceeds from issuance of preferred stock	1,696	1,258	0
Redemption of preferred stock	(1,696)	(1,258)	0
Treasury stock repurchased	(19,983)	(15,410)	(9,082)
Dividends paid	(10,109)	(8,993)	(8,476)
All other financing activities, net	(1,526)	(1,361)	(905)
Net cash provided by financing activities	(30,680)	(16,340)	(3,197)
Net increase/(decrease) in cash and due from banks and deposits with banks	(131)	(62)	(60,310)
Cash and due from banks and deposits with banks at the beginning of the period	5,501	5,563	65,873
Cash and due from banks and deposits with banks at the end of the period	5,370	5,501	5,563
Cash interest paid	6,911	5,426	4,550
Cash income taxes paid, net	$ 1,782	$ 1,775	$ 1,053