RELATED PARTY TRANSACTIONS - Narrative - The Dow Chemical Company - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Dow Inc. [Member]
Related Party Transaction [Line Items]
Dividends declared and paid	$ 2,233	$ 201
DowDuPont
Related Party Transaction [Line Items]
Dividends declared and paid		$ 535	$ 3,711