NONCONSOLIDATED AFFILIATES NONCONSOLIDATED AFFILIATES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 3,321		$ 3,823
Equity Method Investment, Liability, Noncurrent	(870)		(495)
Equity Method Investment, Net of Investment Liabilities	2,451		3,328
Hemlock Semiconductor LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Liability, Noncurrent	(658)		(495)
DC HSC Holdings LLC [Member] [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	485		535
EQUATE Petrochemical Company Ksc [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments			$ 131
Equity Method Investment, Liability, Noncurrent	(212)
Proceeds from Equity Method Investment, Distribution	$ 440
Equity Method Investments [Member] | HSC Group [Member]
Schedule of Equity Method Investments [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		$ 71
Other Noncurrent Obligations [Member] | HSC Group [Member]
Schedule of Equity Method Investments [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		168
Deferred Tax Asset [Domain] | HSC Group [Member]
Schedule of Equity Method Investments [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		56
Retained Earnings [Member] | HSC Group [Member]
Schedule of Equity Method Investments [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		$ 183