Dow Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (801)	$ 458	$ (1,091)	$ 996
Other comprehensive income (loss), net of tax
Unrealized gains (losses) on investments	(22)	61	10	55
Cumulative translation adjustments	129	(43)	251	(165)
Pension and other postretirement benefit plans	21	17	41	34
Derivative instruments	2	(6)	(18)	(28)
Total other comprehensive income (loss)	130	29	284	(104)
Comprehensive income (loss)	(671)	487	(807)	892
Comprehensive income attributable to noncontrolling interests, net of tax	34	19	51	41
Comprehensive income (loss) attributable to Dow Inc.	$ (705)	$ 468	$ (858)	$ 851