Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Statement of Cash Flows [Abstract]
Net income attributable to Union Carbide Corporation	$ 16	$ 214
Depreciation and amortization	102	105
Provision (credit) for deferred income tax	25	3
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	0	(1)
Restructuring and asset related charges - net	0	2
Net periodic pension benefit cost	(2)	27
Pension contributions	(548)	(1)
Other Noncash Income	(1)	0
Accounts and notes receivable	(6)	7
Related company receivables	499	(30)
Inventories	(38)	20
Accounts payable	96	(2)
Related company payables	(31)	(54)
Asbestos-related payments	(38)	(32)
Increase (Decrease) in Other Operating Assets and Liabilities, Net	23	(34)
Cash provided by operating activities	97	224
Capital expenditures	(53)	(65)
Change in noncurrent receivable from related company	(3)	0
Proceeds from Sales of Business, Affiliate and Productive Assets	0	1
Cash used for investing activities	(56)	(64)
Dividends paid to parent	(40)	(162)
Changes in short-term notes payable	0	3
Repayments of Long-term Debt	(1)	(1)
Cash used for financing activities	(41)	(160)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	0	0
Cash and cash equivalents at beginning of period	11	11
Cash and cash equivalents at end of period	$ 11	$ 11