Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net trade sales	$ 136	$ 143	$ 108
Net sales to related companies	5,310	5,022	4,811
Total Net Sales	5,446	5,165	4,919
Cost of sales	4,047	4,184	3,724
Research and development expenses	21	19	18
Selling, general and administrative expenses	6	6	7
Asbestos-related charge	0	0	(1,113)
Restructuring and asset related charges - net	(3)	(74)	(4)
Integration and separation costs	3	1	0
Equity in earnings of a nonconsolidated affiliate	0	0	2
Sundry income (expense) - net	(34)	(3)	27
Interest expense and amortization of debt discount	30	28	25
Income Before Income Taxes	1,302	850	57
Provision (Credit) for income taxes	247	645	(32)
Net Income Attributable to Union Carbide Corporation	$ 1,055	$ 205	$ 89