Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net trade sales	$ 25	$ 31	$ 75	$ 106
Net sales to related companies	817	1,028	2,679	3,270
Total Net Sales	842	1,059	2,754	3,376
Cost of sales	787	854	2,359	2,706
Research and development expenses	6	6	17	19
Selling, general and administrative expenses	2	2	6	4
Restructuring and asset related charges - net	13	77	15	79
Integration and separation costs	0	0	0	2
Sundry income (expense) - net	45	(19)	5	(58)
Interest Income, Other	1	9	10	28
Interest expense and amortization of debt discount	7	7	26	21
Income before income taxes	73	103	346	515
Provision for income taxes	14	(19)	73	38
Net Income Attributable to Union Carbide Corporation	59	122	273	477
Depreciation	46	43	137	128
Capital Expenditures	$ 34	$ 40	$ 99	$ 145