COMMITMENTS AND CONTINGENT LIABILITIES COMMITMENTS AND CONTINGENT LIABILITIES (Dow v Nova) (Details) - Dow V. Nova Chemicals Corporation Patent Infringement Matter [Member] CAD in Millions, $ in Millions				3 Months Ended
	Jul. 06, 2017 USD ($)	Jun. 29, 2017 USD ($)	Jun. 29, 2017 CAD	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Settlement amount		$ 495	CAD 645
Proceeds from settlements	$ 501
Litigation settlement				$ 160
Estimated liability					$ 341
Nonoperating Income (Expense) [Member]
Loss Contingencies [Line Items]
Litigation settlement				137
Selling, General and Administrative Expenses [Member]
Loss Contingencies [Line Items]
Litigation settlement				$ 23