Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Union Carbide Corporation's Stockholder's Equity at Dec. 31, 2017				$ 2,582	$ (1,352)
Net income attributable to Union Carbide Corporation	$ 165			165
Dividends, Common Stock				(111)
Other Comprehensive Income (Loss), Net of Tax	16				16
Union Carbide Corporation's Stockholder's Equity at Mar. 31, 2018	1,438	$ 0	$ 138	2,636	(1,336)
Union Carbide Corporation's Stockholder's Equity at Dec. 31, 2018	1,915			3,338	(1,561)
Net income attributable to Union Carbide Corporation	245			245
Dividends, Common Stock				(632)
Other Comprehensive Income (Loss), Net of Tax	15				15
Union Carbide Corporation's Stockholder's Equity at Mar. 31, 2019	$ 1,543	$ 0	$ 138	$ 2,951	$ (1,546)