Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income attributable to Union Carbide Corporation	$ 129	$ 45
Cumulative translation adjustments	1	1
Pension and other postretirement benefit plans	10	9
Total other comprehensive income	11	10
Comprehensive income attributable to Union Carbide Corporation	$ 140	$ 55