Dow Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 1,552	$ 1,006
Other comprehensive income (loss), net of tax
Unrealized losses on investments	(96)	(49)
Cumulative translation adjustments	(164)	(253)
Pension and other postretirement benefit plans	109	1,134
Derivative instruments	332	110
Total other comprehensive income	181	942
Comprehensive income	1,733	1,948
Comprehensive income (loss) attributable to noncontrolling interests, net of tax	(17)	15
Comprehensive income attributable to Dow Inc.	$ 1,750	$ 1,933