Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Revenue from Contract with Customer, Including Assessed Tax	$ 30	$ 54	$ 94	$ 157
Net sales to related companies	1,108	1,284	3,284	4,228
Net trade sales	1,138	1,338	3,378	4,385
Cost of sales	1,007	1,163	2,913	3,687
Research and development expenses	5	6	16	20
Selling, general and administrative expenses	2	4	8	8
Restructuring and asset related charges - net	0	0	14	0
Sundry income (expense) - net	(22)	(12)	(67)	(40)
Interest Income, Other	10	6	30	9
Interest expense and amortization of debt discount	3	6	13	20
Income before income taxes	109	153	377	619
Provision for income taxes	23	34	79	144
Net Income Attributable to Union Carbide Corporation	$ 86	$ 119	$ 298	$ 475