Dow Inc. Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 6,405	$ 1,294	$ (1,272)
Other comprehensive income (loss), net of tax
Unrealized gains (losses) on investments	(45)	40	115
Cumulative translation adjustments	(425)	205	(32)
Pension and other postretirement benefit plans	2,225	(778)	(899)
Derivative instruments	123	(76)	(338)
Total other comprehensive income (loss)	1,878	(609)	(1,154)
Comprehensive income (loss)	8,283	685	(2,426)
Comprehensive income attributable to noncontrolling interests, net of tax	94	69	99
Comprehensive income (loss) attributable to Dow Inc.	$ 8,189	$ 616	$ (2,525)