Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Statement [Abstract]
Net sales	$ 39,968	$ 42,964	$ 44,622
Cost of sales	37,435	38,358	39,742
Research and development expenses	752	810	829
Selling, general and administrative expenses	1,392	1,581	1,627
Amortization of intangibles	231	310	324
Restructuring, goodwill impairment and asset related charges - net	1,856	103	528
Equity in losses of nonconsolidated affiliates	(240)	(6)	(119)
Sundry income (expense) - net	140	415	(280)
Interest income	152	200	229
Interest expense and amortization of debt discount	865	811	746
Income (loss) before income taxes	(2,511)	1,600	656
Provision (credit) for income taxes	(67)	399	(4)
Net income (loss)	(2,444)	1,201	660
Net income attributable to noncontrolling interests	179	85	71
Net income (loss) available for The Dow Chemical Company common stockholder	$ (2,623)	$ 1,116	$ 589
Earnings (loss) per common share - basic	$ (3.70)	$ 1.57	$ 0.82
Earnings (loss) per common share - diluted	$ (3.70)	$ 1.57	$ 0.82
Weighted-average common shares outstanding - basic	711.6	703.8	705.7
Weighted-average common shares outstanding - diluted	711.6	705.1	709.0