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, 2018		$ 0	$ 138	$ 3,338	$ (1,561)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustments to Additional Paid in Capital, Other			3
Net income attributable to Union Carbide Corporation	$ 627			627
Dividends declared				(1,042)
Stockholders' Equity, Other				(1)
Other Comprehensive Income (Loss), Net of Tax	(104)				(104)
Ending balance at Dec. 31, 2019	1,398	0	141	2,922	(1,665)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustments to Additional Paid in Capital, Other			0
Net income attributable to Union Carbide Corporation	427			427
Dividends declared				(362)
Stockholders' Equity, Other				0
Other Comprehensive Income (Loss), Net of Tax	(105)				(105)
Ending balance at Dec. 31, 2020	1,358	0	141	2,987	(1,770)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustments to Additional Paid in Capital, Other			0
Net income attributable to Union Carbide Corporation	375			375
Dividends declared				(288)
Stockholders' Equity, Other				0
Other Comprehensive Income (Loss), Net of Tax	219				219
Ending balance at Dec. 31, 2021	$ 1,664	$ 0	$ 141	$ 3,074	$ (1,551)