Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenue from Contract with Customer, Including Assessed Tax	$ 61	$ 34
Net sales to related companies	1,518	969
Net trade sales	1,579	1,003
Cost of sales	1,215	1,037
Research and development expenses	7	6
Selling, general and administrative expenses	2	3
Sundry income (expense) - net	(14)	(15)
Interest Income, Other	1	1
Interest expense and amortization of debt discount	7	7
Income before income taxes	335	(64)
Provision for income taxes	80	(15)
Net Income Attributable to Union Carbide Corporation	$ 255	$ (49)