Dow Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (290)	$ 538
Other comprehensive income (loss), net of tax
Unrealized gains (losses) on investments	32	(6)
Cumulative translation adjustments	122	(122)
Pension and other postretirement benefit plans	20	17
Derivative instruments	(20)	(22)
Total other comprehensive income (loss)	154	(133)
Comprehensive income (loss)	(136)	405
Comprehensive income attributable to noncontrolling interests, net of tax	17	22
Comprehensive income (loss) attributable to Dow Inc.	$ (153)	$ 383