CONSOLIDATED FINANCIAL STATEMENTS RECLASSIFICATION - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Reclassification [Line Items]
Other current assets	$ 559	$ 679
Dow Inc. [Member]
Reclassification [Line Items]
Marketable securities		0
Other current assets		679
The Dow Chemical Company [Domain]
Reclassification [Line Items]
Marketable securities		0
Other current assets	$ 484	592
Previously Reported | Dow Inc. [Member]
Reclassification [Line Items]
Marketable securities		21
Other current assets		658
Previously Reported | The Dow Chemical Company [Domain]
Reclassification [Line Items]
Marketable securities		21
Other current assets		$ 571