Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss	Unearned ESOP Shares [Member]	Dow Inc. [Member] Retained Earnings [Member]	The Dow Chemical Company	The Dow Chemical Company Common Stock [Member]	The Dow Chemical Company Additional Paid-in Capital [Member]	The Dow Chemical Company Retained Earnings [Member]	The Dow Chemical Company Accumulated Other Comprehensive Loss	The Dow Chemical Company Unearned ESOP Shares [Member]	The Dow Chemical Company Noncontrolling Interests
Total Equity, Beginning at Dec. 31, 2020		$ 8	$ 7,595	$ 16,361	$ (10,855)	$ (49)			$ 0	$ 7,603	$ 16,300	$ (10,855)	$ (49)
Stock Issued										211
Stock-based compensation and allocation of ESOP shares			182			25				182			25
Net income available for The Dow Chemical Company common stockholder	$ 4,552			4,575							4,576
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees							$ (2,361)
Other				18							(18)
Other comprehensive income	1,190				1,190			$ 1,190				1,190
Total Equity, Ending at Sep. 30, 2021	17,028	8	7,988	19,357	(9,665)	(24)		17,393	0	7,996	18,497	(9,665)	(24)	$ 589
Total Equity, Beginning at Jun. 30, 2021		8	7,898	18,200	(9,676)	(32)			0	7,906	17,745	(9,676)	(32)
Stock Issued										11
Stock-based compensation and allocation of ESOP shares			79			8				79			8
Net income available for The Dow Chemical Company common stockholder	1,675			1,683							1,679
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees							(919)
Other				8							(8)
Other comprehensive income	11				11			11				11
Total Equity, Ending at Sep. 30, 2021	17,028	8	7,988	19,357	(9,665)	(24)		17,393	0	7,996	18,497	(9,665)	(24)	589
The Dow Chemical Company’s stockholders’ equity	16,439							16,804
The Dow Chemical Company’s stockholders’ equity	18,165							18,455
Total Equity, Beginning at Dec. 31, 2021	18,739	8	8,151	20,623	(8,977)	(15)		19,029	0	8,159	19,288	(8,977)	(15)
Stock Issued										99
Stock-based compensation and allocation of ESOP shares			198			15				198			15
Net income available for The Dow Chemical Company common stockholder	3,948			3,969							3,975
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees							(3,755)
Other				13							(17)
Other comprehensive income	(605)				(605)			(605)				(605)
Total Equity, Ending at Sep. 30, 2022	18,629	8	8,396	23,068	(9,582)	0		18,877	0	8,456	19,491	(9,582)	0	512
Total Equity, Beginning at Jun. 30, 2022		8	8,343	22,827	(9,204)	0			0	8,375	20,049	(9,204)	0
Stock Issued										2
Stock-based compensation and allocation of ESOP shares			79			0				79			0
Net income available for The Dow Chemical Company common stockholder	735			739							747
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees							$ (1,301)
Other				5							(4)
Other comprehensive income	(378)				(378)			(378)				(378)
Total Equity, Ending at Sep. 30, 2022	18,629	$ 8	$ 8,396	$ 23,068	$ (9,582)	$ 0		18,877	$ 0	$ 8,456	$ 19,491	$ (9,582)	$ 0	$ 512
The Dow Chemical Company’s stockholders’ equity	$ 18,117							$ 18,365