Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenue from Contract with Customer, Including Assessed Tax	$ 42	$ 37	$ 103	$ 71
Net sales to related companies	1,426	1,289	2,944	2,258
Net trade sales	1,468	1,326	3,047	2,329
Cost of sales	1,309	1,208	2,524	2,245
Research and development expenses	7	6	14	12
Selling, general and administrative expenses	2	2	4	5
Sundry income (expense) - net	(14)	(18)	(28)	(33)
Interest Income, Other	2	0	3	1
Interest expense and amortization of debt discount	7	7	14	14
Income before income taxes	131	85	466	21
Provision for income taxes	30	20	110	5
Net Income Attributable to Union Carbide Corporation	$ 101	$ 65	$ 356	$ 16