Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Cash Flows [Abstract]
Net income attributable to Union Carbide Corporation	$ 129	$ 45
Depreciation and amortization	35	43
Provision (credit) for deferred income tax	8	(4)
Net gain on sales of property and investments	0	1
Gain (Loss) on Sale of Investments	(2)	0
Restructuring and asset related charges - net	0	14
Net periodic pension benefit cost	7	10
Pension contributions	0	(1)
Other Noncash Income (Expense)	1	0
Accounts and notes receivable	(8)	5
Related company receivables	(271)	111
Inventories	(24)	(38)
Accounts payable	33	42
Related company payables	0	(45)
Asbestos-related payments	(23)	(18)
Increase (Decrease) in Other Operating Assets and Liabilities, Net	235	21
Cash provided by operating activities	118	184
Capital expenditures	(76)	(58)
Change in noncurrent receivable from related company	0	1
Proceeds from Sale of Equity Method Investments	2	0
Proceeds from Sales of Business, Affiliate and Productive Assets	0	1
Proceeds from sales of investments	0	7
Cash used for investing activities	(74)	(49)
Dividends paid to parent	(43)	(135)
Changes in short-term notes payable	(1)	1
Repayments of Long-term Debt	0	1
Cash used for financing activities	(44)	(135)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning Balance	11	10
Cash and cash equivalents at end of period	$ 11	$ 10