Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income attributable to Union Carbide Corporation	$ 119	$ 104	$ 475	$ 120
Cumulative translation adjustments	0	1	0	1
Pension and other postretirement benefit plans	19	21	57	125
Total other comprehensive income	19	22	57	126
Comprehensive income attributable to Union Carbide Corporation	$ 138	$ 126	$ 532	$ 246