Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accum. Other Comp Loss
Beginning balance at Dec. 31, 2020		$ 0	$ 141	$ 2,987	$ (1,770)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to Union Carbide Corporation	$ 375			375
Dividends declared				(288)
Other Comprehensive Income (Loss), Net of Tax	219				219
Ending balance at Dec. 31, 2021	1,664	0	141	3,074	(1,551)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustments to Additional Paid in Capital, Other			0
Net income attributable to Union Carbide Corporation	594			594
Dividends declared				(1,063)
Other Comprehensive Income (Loss), Net of Tax	149				149
Ending balance at Dec. 31, 2022	1,344	0	141	2,605	(1,402)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustments to Additional Paid in Capital, Other			0
Net income attributable to Union Carbide Corporation	381			381
Dividends declared				(512)
Other Comprehensive Income (Loss), Net of Tax	59				59
Ending balance at Dec. 31, 2023	2,165	$ 0	1,034	$ 2,474	$ (1,343)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustments to Additional Paid in Capital, Other	$ 893		$ 893