GOODWILL AND OTHER INTANGIBLE ASSETS (Annual Goodwill Impairment Test) (Details) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 USD ($) ReportingUnits	Dec. 31, 2018 USD ($) ReportingUnits	Dec. 31, 2017 USD ($) ReportingUnits
Goodwill [Line Items]
Number of Reporting Units, Quantitative Testing | ReportingUnits			2	1	4
Goodwill	$ 8,796	$ 9,833	$ 8,796	$ 9,846	$ 9,833
Coatings and Performance Monomers
Goodwill [Line Items]
Goodwill	0	1,071	0		1,071
Industrial Intermediates & Infrastructure [Member]
Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss	309		309	309
Goodwill	1,100	1,101	1,100	1,095	1,101
Performance Materials & Coatings [Member]
Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss	2,530		2,530	1,491
Goodwill	2,587	3,689	2,587	$ 3,650	$ 3,689
Goodwill, Purchase Accounting Adjustments	$ (1,039)	$ (1,491)	$ 1,039