Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Net trade sales	$ 154	$ 129	$ 138
Net sales to related companies	4,951	3,574	4,239
Total net sales	5,105	3,703	4,377
Cost of sales	4,463	3,245	3,500
Research and development expenses	25	24	25
Selling, general and administrative expenses	9	9	4
Restructuring Charges	1	15	79
Integration and separation costs	0	0	2
Total sundry income (expense) - net	(53)	168	(82)
Interest Income, Other	2	12	36
Interest expense and amortization of debt discount	27	33	30
Income Before Income Taxes	529	557	691
Provision (Credit) for income taxes	154	130	64
Net Income Attributable to Union Carbide Corporation	$ 375	$ 427	$ 627