Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Statement of Cash Flows [Abstract]
Net income attributable to Union Carbide Corporation	$ 273	$ 477
Depreciation and amortization	159	148
Provision (credit) for deferred income tax	3	(23)
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	(87)	1
Restructuring and asset related charges - net	15	79
Net periodic pension benefit cost	41	39
Pension contributions	(2)	(2)
Gain (Loss) on Extinguishment of Debt	19	0
Accounts and notes receivable	11	7
Related company receivables	(29)	39
Inventories	15	34
Accounts payable	14	(58)
Related company payables	(76)	(195)
Asbestos-related payments	(49)	(68)
Increase (Decrease) in Other Operating Assets and Liabilities, Net	(21)	14
Cash provided by operating activities	286	492
Capital expenditures	(99)	(145)
Change in noncurrent receivable from related company	0	(13)
Proceeds from Sales of Business, Affiliate and Productive Assets	98	1
Proceeds from sales of investments	0	3
Cash used for investing activities	(1)	(154)
Dividends paid to parent	(187)	(338)
Changes in short-term notes payable	5	1
Repayments of Long-term Debt	(84)	(1)
Payments of Financing Costs	(19)	0
Cash used for financing activities	(285)	(338)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	0	0
Cash and cash equivalents	$ 11	$ 13