Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Revenue from Contract with Customer, Including Assessed Tax	$ 31	$ 37
Net sales to related companies	1,067	1,038
Net trade sales	1,098	1,075
Cost of sales	931	981
Research and development expenses	5	6
Selling, general and administrative expenses	2	2
Restructuring and asset related charges - net	0	14
Sundry income (expense) - net	(25)	(22)
Interest Income, Other	33	11
Interest expense and amortization of debt discount	3	6
Income before income taxes	165	55
Provision for income taxes	36	10
Net Income Attributable to Union Carbide Corporation	$ 129	$ 45