COMMITMENTS AND CONTINGENT LIABILITIES Indemnifications with Corning (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Jun. 01, 2016
Loss Contingencies [Line Items]
Document Period End Date	Sep. 30, 2019
Other noncurrent assets
Loss Contingencies [Line Items]
Indemnification Asset	$ 16
Dow Silicones Corporation [Member]
Loss Contingencies [Line Items]
Business Combination, Indemnification Assets, Percentage of Future Losses			50.00%
Indemnification Asset	100	$ 0
Dow Silicones Corporation [Member] | Commercial Creditors Litigation [Member]
Loss Contingencies [Line Items]
Indemnification Asset	37
Environmental Issue [Member] | Dow Silicones Corporation [Member]
Loss Contingencies [Line Items]
Indemnification Asset	48
Environmental Issue [Member] | Dow Silicones Corporation [Member] | Other noncurrent assets
Loss Contingencies [Line Items]
Indemnification Asset	$ 63