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	Treasury Stock [Member]	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	The Dow Chemical Company Treasury Stock [Member]	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, 2016		$ 3,107	$ 4,262	$ 30,338	$ (9,822)	$ (239)	$ (1,659)		$ 3,107	$ 4,262	$ 30,338	$ (9,822)	$ (239)	$ (1,659)
Merger impact		3,107	2,172				935		(3,107)	2,172				935
Common stock issued/sold			423				724			423				724
Issuance of parent company stock			66												$ 0		$ 66
Stock-based compensation and allocation of ESOP shares			(368)			50				(368)			50
Other			2	25						(2)	(25)
Adoption of accounting standards (Note 1)				0	0						0	0
Net income (loss) available for The Dow Chemical Company common stockholder	$ 465			465				$ 465			465
Dividends to stockholders				(1,673)							(1,673)
Dividends to parent				(1,056)												$ 0		$ (1,056)
Settlements and transfers related to separation from DowDuPont Inc.	(6)			5,693	0			(6)			5,693
Other comprehensive income (loss)	1,231				1,231			1,231				1,231
ESOP shares acquired						0							0
Ending balance at Dec. 31, 2017	32,701	0	6,553	33,742	(8,591)	(189)	0	32,701	0	6,553	33,742	(8,591)	(189)	0
The Dow Chemical Company’s stockholder's equity	31,515							31,515
Noncontrolling interests	1,186							1,186
Merger impact		0	0				0		0	0				0
Common stock issued/sold			0				0			0				0
Issuance of parent company stock			112												0		112
Stock-based compensation and allocation of ESOP shares			377			55				377			55
Other			0	19						0	(19)
Adoption of accounting standards (Note 1)				989	(1,037)						989	(1,037)
Net income (loss) available for The Dow Chemical Company common stockholder	4,641			4,641				4,641			4,641
Dividends to stockholders				0							0
Dividends to parent				(3,711)												0		(3,711)
Settlements and transfers related to separation from DowDuPont Inc.	240			(182)	0			240			(182)
Other comprehensive income (loss)	(257)				(257)			(257)				(257)
ESOP shares acquired						0							0
Ending balance at Dec. 31, 2018	33,621	0	7,042	35,460	(9,885)	(134)	0	33,621	0	7,042	35,460	(9,885)	(134)	0
The Dow Chemical Company’s stockholder's equity	32,483							32,483
Noncontrolling interests	1,138							1,138
Merger impact		0	0				0		0	0				0
Common stock issued/sold			57				0			0				0
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)
Adoption of accounting standards (Note 1)				(151)	0						(151)	0
Net income (loss) available for The Dow Chemical Company common stockholder	(1,359)			(1,359)				(1,237)			(1,237)
Dividends to stockholders				(1,550)							0
Dividends to parent				(535)												$ (201)		$ (535)
Settlements and transfers related to separation from DowDuPont Inc.	(1,935)			(14,806)	793			61			(16,009)	793
Other comprehensive income (loss)	(1,154)				(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)	$ (500)	14,862	$ 0	$ 7,333	$ 17,313	$ (10,246)	$ (91)	$ 0
The Dow Chemical Company’s stockholder's equity	13,541							14,309
Noncontrolling interests	$ 553							$ 553