NONCONSOLIDATED AFFILIATES (Impact of Sales to Nonconsolidated Affiliates) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 3,823	$ 3,742
Other noncurrent obligations	(495)	(752)
Equity Method Investment, Net of Investment Liabilities	$ 3,328	$ 2,990
Customer Concentration Risk | Equity Method Investee | MEGlobal
Schedule of Equity Method Investments [Line Items]
Concentration Risk, Percentage	1.00%	1.00%	1.00%
Customer Concentration Risk | Equity Method Investee | HSC Group
Schedule of Equity Method Investments [Line Items]
Concentration Risk, Percentage	1.00%	1.00%
Sadara Chemical Company | Equity Method Investee | Sadara Chemical Company
Schedule of Equity Method Investments [Line Items]
Concentration Risk, Percentage	8.00%	3.00%
SCG-Dow Group | Equity Method Investee | SCG-Dow Group
Schedule of Equity Method Investments [Line Items]
Concentration Risk, Percentage		2.00%	3.00%
SCG-Dow Group | Supplier Concentration Risk | Equity Method Investee | SCG-Dow Group
Schedule of Equity Method Investments [Line Items]
Concentration Risk, Percentage	2.00%