Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Net trade sales	$ 147	$ 191	$ 154
Net sales to related companies	4,149	5,258	4,951
Total net sales	4,296	5,449	5,105
Cost of sales	3,804	4,586	4,463
Research and development expenses	22	26	25
Selling, general and administrative expenses	10	10	9
Restructuring Charges	14	0	1
Total sundry income (expense) - net	(25)	(53)	(53)
Interest Income, Other	49	18	2
Interest expense and amortization of debt discount	16	26	27
Income Before Income Taxes	454	766	529
Provision (Credit) for income taxes	73	172	154
Net Income Attributable to Union Carbide Corporation	$ 381	$ 594	$ 375