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RELATED PARTY TRANSACTIONS (Tables)
 9 Months Ended
Sep. 30, 2021
Related Party Transactions [Abstract]  
Dividends Declared The following table summarizes cash dividends TDCC declared and paid to Dow Inc. for the three and nine months ended September 30, 2021 and 2020:
TDCC Cash Dividends Declared and PaidThree Months EndedNine Months Ended
Sep 30, 2021Sep 30, 2020Sep 30, 2021Sep 30, 2020
In millions
Cash dividends declared and paid$919 $513 $2,361 $1,685