Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Statement of Cash Flows [Abstract]
Net income attributable to Union Carbide Corporation	$ 120	$ 273
Depreciation and amortization	150	159
Provision (credit) for deferred income tax	48	3
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	0	(87)
Restructuring and asset related charges - net	1	15
Net periodic pension benefit cost	(3)	41
Pension contributions	(548)	(2)
Gain (Loss) on Extinguishment of Debt	0	19
Other Noncash Income (Expense)	9	0
Accounts and notes receivable	(5)	11
Related company receivables	377	(29)
Inventories	(8)	15
Accounts payable	65	14
Related company payables	(25)	(76)
Asbestos-related payments	(51)	(49)
Increase (Decrease) in Other Operating Assets and Liabilities, Net	76	(21)
Cash provided by operating activities	206	286
Capital expenditures	(85)	(99)
Change in noncurrent receivable from related company	(3)	0
Proceeds from Sales of Business, Affiliate and Productive Assets	1	98
Cash used for investing activities	(87)	(1)
Dividends paid to parent	(118)	(187)
Changes in short-term notes payable	0	5
Repayments of Long-term Debt	(2)	(84)
Payments of Financing Costs	0	(19)
Cash used for financing activities	(120)	(285)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	(1)	0
Cash and cash equivalents at beginning of period	11	11
Cash and cash equivalents at end of period	$ 10	$ 11