Dow Consolidated Statements of Income Statement - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales	$ 8,354	$ 11,014	$ 18,124	$ 21,983
Cost of sales	7,610	9,420	15,840	18,562
Research and development expenses	182	208	361	398
Selling, general and administrative expenses	357	422	691	870
Amortization of intangibles	100	104	200	220
Restructuring and asset related charges - net	6	65	102	221
Integration and separation costs	46		111
Equity in losses of nonconsolidated affiliates	(95)	(15)	(184)	(29)
Sundry income (expense) - net	53	(1)	(28)	68
Interest income	6	21	21	39
Interest expense and amortization of debt discount	200	237	415	478
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total	(183)	215	213	512
Provision for income taxes on continuing operations	34	125	172	266
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	(217)	90	41	246
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	0	0	445
Net income (loss)	(217)	90	41	691
Net income attributable to noncontrolling interests	8	15	27	60
Net income (loss) available for Dow Inc. common stockholders	$ (225)	$ 75	$ 14	$ 631
Earnings (loss) per common share from continuing operations - basic	$ (0.31)	$ 0.10	$ 0.01	$ 0.26
Earnings per common share from discontinued operations - basic	0	0	0	0.58
Earnings (loss) per common share - basic	(0.31)	0.10	0.01	0.84
Earnings (loss) per common share from continuing operations - diluted	(0.31)	0.10	0.01	0.26
Earnings per common share from discontinued operations - diluted	0	0	0	0.58
Earnings (loss) per common share - diluted	$ (0.31)	$ 0.10	$ 0.01	$ 0.84
Weighted-average common shares outstanding - basic	739.3	742.8	739.7	745.0
Weighted-average common shares outstanding - diluted	739.3	747.9	741.0	747.6
Depreciation	$ 517	$ 538	$ 1,032	$ 1,081
Capital expenditures	$ 273	$ 470	$ 668	$ 912