Dow Consolidated Statements of Income Statement - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net sales	$ 9,770	$ 10,969
Cost of sales	8,230	9,142
Research and development expenses	179	190
Selling, general and administrative expenses	334	448
Amortization of intangibles	100	116
Restructuring and asset related charges - net	96	156
Integration and separation costs	65	452
Equity in losses of nonconsolidated affiliates	(89)	(14)
Sundry income (expense) - net	(81)	69
Interest income	15	18
Interest expense and amortization of debt discount	215	241
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total	396	297
Provision for income taxes on continuing operations	138	141
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	258	156
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	445
Net income	258	601
Net income attributable to noncontrolling interests	19	45
Net income available for Dow Inc. common stockholders	$ 239	$ 556
Earnings per common share from continuing operations - basic	$ 0.32	$ 0.16
Earnings per common share from discontinued operations - basic	0	0.58
Earnings per common share - basic	0.32	0.74
Earnings per common share from continuing operations - diluted	0.32	0.16
Earnings per common share from discontinued operations - diluted	0	0.58
Earnings per common share - diluted	$ 0.32	$ 0.74
Weighted-average common shares outstanding - basic	740.2	747.2
Weighted-average common shares outstanding - diluted	742.0	747.2
Depreciation	$ 515	$ 543
Capital expenditures	$ 395	$ 442