Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net trade sales	$ 138	$ 136	$ 143
Net sales to related companies	4,239	5,310	5,022
Total Net Sales	4,377	5,446	5,165
Cost of sales	3,500	4,047	4,184
Research and development expenses	25	21	19
Selling, general and administrative expenses	4	6	6
Restructuring and asset related charges - net	(79)	(3)	(74)
Integration and separation costs	2	3	1
Total sundry income (expense) - net	(82)	(62)	(23)
Interest Income, Other	36	28	20
Interest expense and amortization of debt discount	30	30	28
Income Before Income Taxes	691	1,302	850
Provision (Credit) for income taxes	64	247	645
Net Income Attributable to Union Carbide Corporation	$ 627	$ 1,055	$ 205