Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income attributable to Union Carbide Corporation	$ 101	$ 65	$ 356	$ 16
Cumulative translation adjustments	2	0	0	0
Pension and other postretirement benefit plans	19	20	38	104
Total other comprehensive income	21	20	38	104
Comprehensive income attributable to Union Carbide Corporation	$ 122	$ 85	$ 394	$ 120