NONCONSOLIDATED AFFILIATES AND RELATED COMPANY TRANSACTIONS, Impact of Sales to Nonconsolidated Affiliates (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 3,742	$ 3,747
Concentration Risk, Percentage	98.00%	99.00%	99.00%
Customer Concentration Risk [Member] | Equity Method Investee [Member] | MEGlobal [Member]
Schedule of Equity Method Investments [Line Items]
Concentration Risk, Percentage	1.00%	1.00%	1.00%
Customer Concentration Risk [Member] | Equity Method Investee [Member] | HSC Group [Member]
Schedule of Equity Method Investments [Line Items]
Concentration Risk, Percentage	1.00%	1.00%
Sadara Chemical Company [Member] | Equity Method Investee [Member] | Sadara Chemical Company [Member]
Schedule of Equity Method Investments [Line Items]
Concentration Risk, Percentage	3.00%
SCG-Dow Group [Member] | Equity Method Investee [Member] | SCG-Dow Group [Member]
Schedule of Equity Method Investments [Line Items]
Concentration Risk, Percentage		3.00%	3.00%
SCG-Dow Group [Member] | Supplier Concentration Risk [Member] | Equity Method Investee [Member] | SCG-Dow Group [Member]
Schedule of Equity Method Investments [Line Items]
Concentration Risk, Percentage	2.00%