Parent Company - Statements of Cash Flows (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating activities
Net income		$ 29,131	$ 36,431	$ 32,474
Other operating adjustments	[1]	3,115	2,233	(1,343)
Net cash provided by/(used in) operating activities		(79,910)	4,092	15,614
Investing activities
All other investing activities, net		(7,341)	(5,035)	(4,986)
Net cash (used in) investing activities		(261,912)	(52,059)	(199,420)
Financing activities
Net change in: Short-term borrowings			(28,561)
Proceeds from long-term borrowings		78,686	61,085	71,662
Payments of long-term borrowings		(105,055)	(69,610)	(76,313)
Proceeds from issuance of preferred stock		4,500	5,000	1,696
Redemption of preferred stock		(1,430)	(4,075)	(1,696)
Treasury stock repurchased		(6,517)	(24,001)	(19,983)
Dividends paid		(12,690)	(12,343)	(10,109)
All other financing activities, net		(927)	(1,146)	(1,430)
Net cash provided by financing activities		596,645	32,987	34,158
Net increase/(decrease) in cash and due from banks and deposits with banks		263,978	(15,162)	(152,511)
Cash and due from banks and deposits with banks at the beginning of the period		263,631	278,793	431,304
Cash and due from banks and deposits with banks at the end of the period		527,609	263,631	278,793
Cash interest paid		13,077	29,918	21,152
Cash income taxes paid, net		7,661	5,624	3,542
JPMorgan Chase & Co.
Operating activities
Net income		29,131	36,431	32,474
Less: Net income of subsidiaries and affiliates		33,631	42,906	38,125
Parent company net loss		(4,500)	(6,475)	(5,651)
Cash dividends from subsidiaries and affiliates		6,000	26,000	32,501
Other operating adjustments		15,357	9,862	(4,400)
Net cash provided by/(used in) operating activities		16,857	29,387	22,450
Investing activities
Net change in: Advances to and investments in subsidiaries and affiliates, net		(2,663)	(6)	8,036
All other investing activities, net		24	71	63
Net cash (used in) investing activities		(2,639)	65	8,099
Financing activities
Net change in: Borrowings from subsidiaries and affiliates		1,425	2,941	(2,273)
Net change in: Short-term borrowings		(20)	(56)	(678)
Proceeds from long-term borrowings		37,312	25,569	25,845
Payments of long-term borrowings		(34,194)	(21,226)	(21,956)
Proceeds from issuance of preferred stock		4,500	5,000	1,696
Redemption of preferred stock		(1,430)	(4,075)	(1,696)
Treasury stock repurchased		(6,517)	(24,001)	(19,983)
Dividends paid		(12,690)	(12,343)	(10,109)
All other financing activities, net		(1,080)	(1,290)	(1,526)
Net cash provided by financing activities		(12,694)	(29,481)	(30,680)
Net increase/(decrease) in cash and due from banks and deposits with banks		1,524	(29)	(131)
Cash and due from banks and deposits with banks at the beginning of the period		5,341	5,370	5,501
Cash and due from banks and deposits with banks at the end of the period		6,865	5,341	5,370
Cash interest paid		5,445	7,957	6,911
Cash income taxes paid, net		$ 5,366	$ 3,910	$ 1,782

[1] In the third quarter of 2020, the Firm reclassified certain fair value option elected lending-related positions from trading assets to loans and other assets. Prior-period amounts have been revised to conform with the current presentation.