SEPARATION FROM DOWDUPONT Separation, Distribution and Tax Agreements (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Apr. 01, 2019
Integration and separation costs	$ 63	$ 164		$ 174	$ 964
Charges related to separation, distribution and tax matters agreements		0			127
Integration and separation costs [Member]
Charges related to separation, distribution and tax matters agreements			$ 24
Sundry Income (Expense), Net [Member]
Charges related to separation, distribution and tax matters agreements			$ 52
Other Current Assets [Member]
Indemnification Asset	58			58		$ 58
Other noncurrent assets
Indemnification Asset	33			33		52
Accrued and Other Current Liabilities [Member]
Indemnification liability	333			333		352
Deferred cash contribution	264			264		130
Other Noncurrent Obligations [Member]
Indemnification liability	100			100		96
Deferred cash contribution	136			136		$ 270	$ 400
The Dow Chemical Company [Domain]
Integration and separation costs	$ 63	$ 164		$ 174	$ 940