Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Net sales	$ 54,968	$ 38,542	$ 42,951
Cost of sales	44,191	33,346	36,657
Research and development expenses	857	768	765
Selling, general and administrative expenses	1,645	1,471	1,590
Amortization of intangibles	388	401	419
Restructuring, goodwill impairment and asset related charges - net	6	708	3,219
Integration and separation costs	0	239	1,063
Equity in earnings (losses) of nonconsolidated affiliates	975	(18)	(94)
Sundry income (expense) - net	(35)	1,269	461
Interest income	55	38	81
Interest expense and amortization of debt discount	731	827	933
Income (loss) from continuing operations before income taxes	8,145	2,071	(1,247)
Provision for income taxes on continuing operations	1,740	777	470
Income (loss) from continuing operations, net of tax	6,405	1,294	(1,717)
Income from discontinued operations, net of tax	0	0	445
Net income (loss)	6,405	1,294	(1,272)
Net income attributable to noncontrolling interests	94	69	87
Net income (loss) available for The Dow Chemical Company common stockholder	$ 6,311	$ 1,225	$ (1,359)
Earnings (loss) per common share from continuing operations - basic	$ 8.44	$ 1.64	$ (2.42)
Earnings per common share from discontinued operations - basic	0	0	0.58
Earnings (loss) per common share - basic	8.44	1.64	(1.84)
Earnings (loss) per common share from continuing operations - diluted	8.38	1.64	(2.42)
Earnings per common share from discontinued operations - diluted	0	0	0.58
Earnings (loss) per common share - diluted	$ 8.38	$ 1.64	$ (1.84)
Weighted-average common shares outstanding - basic	743.6	740.5	742.5
Weighted-average common shares outstanding - diluted	749.0	742.3	742.5