ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Translation adjustments		$ 0	$ (1)	$ 0	$ (2)
Adjustments to pension and other postretirement benefit plans		14	10	38	30
Accumulated Other Comprehensive Income (Loss) [Member]
Union Carbide Corporation's Stockholder's Equity, Beginning				(1,243)	(1,045)
Union Carbide Corporation's Stockholder's Equity, Ending		(1,205)	(1,017)	(1,205)	(1,017)
Accumulated Translation Adjustment [Member]
Translation adjustments				0	(1)
Union Carbide Corporation's Stockholder's Equity, Beginning				(63)	(78)
Union Carbide Corporation's Stockholder's Equity, Ending		(63)	(80)	(63)	(80)
Accumulated Defined Benefit Plans and Other Post Retirement Adjustment [Member]
Union Carbide Corporation's Stockholder's Equity, Beginning				(1,180)	(967)
Adjustments to pension and other postretirement benefit plans	[1],[2]			38	30
Adjustments to pension and other postretirement benefit plans, tax	[2]			(19)	(17)
Union Carbide Corporation's Stockholder's Equity, Ending		$ (1,142)	$ (937)	(1,142)	(937)
Impact to Sundry income (expense) [Member]
Reclassification to earnings - Sundry income (expense) - net				$ 0	$ (1)

[1] Included in "Net periodic benefit cost." See Note 8 for additional information.

[2] Tax amounts are included in "Provision for income taxes" in the consolidated statements of income.