INCOME TAXES (Schedule of Domestic and Foreign Components of Income Before Income Taxes and Tax Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosures [Abstract]
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense(Benefit)	$ 250
Income (Loss) from Continuing Operations before Income Taxes, Domestic	856	$ 49	$ 1,254
Income (Loss) Before Income Taxes, Foreign	(6)	8	(11)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	850	57	1,243
Current Federal Tax Expense (Benefit)	226	265	373
Current State and Local Tax Expense (Benefit)	2	(3)	2
Current Foreign Tax Expense (Benefit)	3	3	104
Current Income Tax Expense (Benefit)	231	265	479
Deferred Federal Income Tax Expense (Benefit)	392	(285)	(31)
Deferred State and Local Income Tax Expense (Benefit)	22	(12)	(13)
Deferred Income Tax Expense (Benefit)	414	(297)	(44)
Total tax provision (credit)	645	(32)	435
Net Income Attributable to Union Carbide Corporation	$ 205	$ 89	$ 808