Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income attributable to Union Carbide Corporation	$ 45	$ 255
Cumulative translation adjustments	1	(2)
Pension and other postretirement benefit plans	9	19
Total other comprehensive income	10	17
Comprehensive income attributable to Union Carbide Corporation	$ 55	$ 272