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, 2021	Dec. 31, 2020	Dec. 31, 2019
Geographic Allocation of Income and Provision (Credit) for Income Taxes [Abstract]
Income (Loss) Before Income Taxes, Domestic	$ 531	$ 558	$ 696
Income (Loss) Before Income Taxes, Foreign	(2)	(1)	(5)
Income before income taxes	529	557	691
Current Federal Tax Expense (Benefit)	(11)	82	70
Current State and Local Tax Expense (Benefit)	5	2	4
Current Foreign Tax Expense (Benefit)	20	0	0
Current Income Tax Expense (Benefit)	14	84	74
Deferred Federal Income Tax Expense (Benefit)	122	42	(9)
Deferred State and Local Income Tax Expense (Benefit)	23	4	(1)
Deferred Foreign Income Tax Expense (Benefit)	(5)	0	0
Deferred Income Tax Expense (Benefit)	140	46	(10)
Provision for income taxes	154	130	64
Net Income Attributable to Union Carbide Corporation	$ 375	$ 427	$ 627