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, 2023	Dec. 31, 2022	Dec. 31, 2021
Geographic Allocation of Income and Provision (Credit) for Income Taxes [Abstract]
Income (Loss) Before Income Taxes, Domestic	$ 455	$ 767	$ 531
Income (Loss) Before Income Taxes, Foreign	(1)	(1)	(2)
Income before income taxes	454	766	529
Current Federal Tax Expense (Benefit)	96	157	(11)
Current State and Local Tax Expense (Benefit)	(6)	9	5
Current Foreign Tax Expense (Benefit)	1	1	20
Current Income Tax Expense (Benefit)	91	167	14
Deferred Federal Income Tax Expense (Benefit)	(19)	(2)	122
Deferred State and Local Income Tax Expense (Benefit)	1	3	23
Deferred Foreign Income Tax Expense (Benefit)	0	4	(5)
Deferred Income Tax Expense (Benefit)	(18)	5	140
Provision for income taxes	73	172	154
Net Income Attributable to Union Carbide Corporation	$ 381	$ 594	$ 375