TDCC Consolidated Statements of Equity Statement - USD ($) $ in Millions	Total	Common Stock	Add'l Paid-in Capital	Retained Earnings [Member]	Accumulated Other Comprehensive Loss	Unearned ESOP	The Dow Chemical Company	The Dow Chemical Company Common Stock	The Dow Chemical Company Add'l Paid-in Capital	The Dow Chemical Company Retained Earnings [Member]	The Dow Chemical Company Accumulated Other Comprehensive Loss	The Dow Chemical Company Unearned ESOP	Dow Inc. [Member] The Dow Chemical Company Add'l Paid-in Capital	Dow Inc. [Member] The Dow Chemical Company Retained Earnings [Member]	DowDuPont The Dow Chemical Company Add'l Paid-in Capital	DowDuPont The Dow Chemical Company Retained Earnings [Member]
Beginning balance at Dec. 31, 2018		$ 0	$ 7,042	$ 35,460	$ (9,885)	$ (134)		$ 0	$ 7,042	$ 35,460	$ (9,885)	$ (134)
Issuance of parent company stock			28										$ 65		$ 28
Stock-based compensation and allocation of ESOP shares			235			45			235			45
Other			37	14					(37)	(14)
Net income (loss) available for The Dow Chemical Company common stockholder	$ (1,359)			(1,359)			$ (1,237)			(1,237)
Dividends to parent				(535)										$ (201)		$ (535)
Settlements and transfers related to separation from DowDuPont Inc.	1,935			(14,806)	793		61			(16,009)	793
Stockholders' Equity, Period Increase (Decrease) | Accounting Standards Update 2014-09				(151)						(151)
Other comprehensive income (loss)	(1,154)				(1,154)						(1,154)
ESOP shares acquired						(2)						(2)
Ending balance at Dec. 31, 2019	14,094	8	7,325	17,045	(10,246)	(91)	14,862	0	7,333	17,313	(10,246)	(91)
The Dow Chemical Company’s stockholder's equity	13,541						14,309
Noncontrolling interests	553						553
Issuance of parent company stock			0										108		0
Stock-based compensation and allocation of ESOP shares			162			42			162			42
Other			0	15					0	(15)
Net income (loss) available for The Dow Chemical Company common stockholder	1,225			1,225			1,235			1,235
Dividends to parent				0										(2,233)		0
Settlements and transfers related to separation from DowDuPont Inc.	0			177	0		0			0	0
Stockholders' Equity, Period Increase (Decrease) | Accounting Standards Update 2014-09				0						0
Other comprehensive income (loss)	(609)				(609)						(609)
ESOP shares acquired						0						0
Ending balance at Dec. 31, 2020	13,005	8	7,595	16,361	(10,855)	(49)	13,569	$ 0	7,603	16,300	(10,855)	(49)
The Dow Chemical Company’s stockholder's equity	12,435						12,999
Noncontrolling interests	570						570
Issuance of parent company stock			0										$ 320		$ 0
Stock-based compensation and allocation of ESOP shares			236			34			236			34
Other			0	22					0	(22)
Net income (loss) available for The Dow Chemical Company common stockholder	6,311			6,311			6,274			6,274
Dividends to parent				0										$ (3,264)		$ 0
Settlements and transfers related to separation from DowDuPont Inc.	0			46	0		0			0	0
Stockholders' Equity, Period Increase (Decrease) | Accounting Standards Update 2014-09				0						0
Other comprehensive income (loss)	1,878				1,878						1,878
ESOP shares acquired						0						0
Ending balance at Dec. 31, 2021	18,739	$ 8	$ 8,151	$ 20,623	$ (8,977)	$ (15)	19,029		$ 8,159	$ 19,288	$ (8,977)	$ (15)
The Dow Chemical Company’s stockholder's equity	18,165						18,455
Noncontrolling interests	$ 574						$ 574