COMMITMENTS AND CONTINGENT LIABILITIES (Dow Silicones Chapter 11 Related Matters) (Details) - USD ($) $ in Millions			3 Months Ended		12 Months Ended
	Jun. 01, 2016	Jun. 01, 2004	Sep. 30, 2019	Jun. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Commercial Creditors Litigation
Loss Contingencies [Line Items]
Decrease in liability					$ (50)	$ 0	$ 33
Other Noncurrent Assets [Member]
Loss Contingencies [Line Items]
Indemnification asset					52
Breast Implant and Other Products Liability Claims
Loss Contingencies [Line Items]
Decrease in liability					85	0	$ 0
Dow Silicones Corporation
Loss Contingencies [Line Items]
Indemnification percentage	50.00%
Indemnification asset			$ 100			0
Dow Silicones Corporation | Between May 31, 2018 and May 31, 2023
Loss Contingencies [Line Items]
Indemnification loss cap	$ 1,000
Dow Silicones Corporation | After May 31, 2023
Loss Contingencies [Line Items]
Indemnification loss cap	$ 0
Dow Silicones Corporation | Commercial Creditors Litigation
Loss Contingencies [Line Items]
Decrease in liability			(50)	$ 33
Estimated litigation liability						82
Indemnification asset			37
Dow Silicones Corporation | Commercial Creditor Issues | Minimum
Loss Contingencies [Line Items]
Estimate of possible loss				77
Dow Silicones Corporation | Commercial Creditor Issues | Maximum
Loss Contingencies [Line Items]
Estimate of possible loss				$ 260
Dow Silicones Corporation | Accrued and other current liabilities | Commercial Creditors Litigation
Loss Contingencies [Line Items]
Estimated litigation liability			172
Dow Silicones Corporation | Breast Implant and Other Products Liability Claims
Loss Contingencies [Line Items]
Maximum net present value		$ 2,350
Discount rate		7.00%
Undiscounted product liability					4,019
Portion available to fund the Litigation Facility		$ 400
Payments for product liabilities					1,762
Unexpended balance					74
Product liability						263
Decrease in liability			98
Liability maximum capped amount					2,257
Dow Silicones Corporation | Breast Implant and Other Products Liability Claims | Other Noncurrent Obligations
Loss Contingencies [Line Items]
Product liability			165		145	152
Dow Silicones Corporation | Breast Implant and Other Products Liability Claims | Accrued and other current liabilities
Loss Contingencies [Line Items]
Product liability					$ 20	$ 111
Dow Silicones Corporation | Commercial Creditors Litigation
Loss Contingencies [Line Items]
Payments for legal settlements		$ 1,500
Class 16 receivable [Member] | Dow Silicones Corporation | Breast Implant and Other Products Liability Claims
Loss Contingencies [Line Items]
Decrease in liability			(13)
Environmental Issue [Member] | Dow Silicones Corporation
Loss Contingencies [Line Items]
Indemnification asset			48
Environmental Issue [Member] | Dow Silicones Corporation | Other Noncurrent Assets [Member]
Loss Contingencies [Line Items]
Indemnification asset			$ 63