Dow Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 327	$ 760	$ 755	$ 3,993
Other comprehensive income (loss), net of tax
Unrealized gains (losses) on investments	(20)	(122)	72	(371)
Cumulative translation adjustments	(147)	(403)	(149)	(1,081)
Pension and other postretirement benefit plans	(2)	125	0	356
Derivative instruments	(25)	22	(45)	491
Total other comprehensive loss	(194)	(378)	(122)	(605)
Comprehensive income	133	382	633	3,388
Comprehensive income attributable to noncontrolling interests, net of tax	25	21	61	24
Comprehensive income (loss) attributable to Dow Inc.	$ 108	$ 361	$ 572	$ 3,364