ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014	Dec. 31, 2013
Translation adjustments	$ 1		$ 0
Adjustments to pension and other postretirement benefit plans	12		10
Accumulated Other Comprehensive Income (Loss) [Member]
Union Carbide Corporation's stockholder's equity	(1,230)		(1,035)		(1,243)	(1,045)
Accumulated Translation Adjustment [Member]
Translation adjustments	1		0
Union Carbide Corporation's stockholder's equity	(62)		(78)		(63)	(78)
Accumulated Defined Benefit Plans and Other Post Retirement Adjustment [Member]
Adjustments to pension and other postretirement benefit plans	12	[1],[2]	10	[1],[2]
Adjustments to pension and other postretirement benefit plans, tax	(7)	[1]	(6)	[1]
Union Carbide Corporation's stockholder's equity	$ (1,168)		$ (957)		$ (1,180)	$ (967)

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

[2] Included in "Net periodic benefit cost." See Note 7 for additional information.