RELATD PARTY TRANSACTIONS (Notes)	3 Months Ended
	Mar. 31, 2021
Related Party Transactions [Abstract]
Related Party Transactions Disclosure [Text Block]	RELATED PARTY TRANSACTIONSTDCC has committed to fund Dow Inc.'s dividends paid to common stockholders and share repurchases, as approved by Dow Inc.'s Board from time to time, as well as certain governance expenses. Funding is accomplished through intercompany loans. TDCC's Board reviews and determines a dividend distribution to Dow Inc. to settle the intercompany loans. For the three months ended March 31, 2021, TDCC declared and paid dividends to Dow Inc. of $703 million ($643 million for the three months ended March 31, 2020). At March 31, 2021 and December 31, 2020, TDCC's outstanding intercompany loan balance with Dow Inc. was insignificant.