Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net Income Attributable to Union Carbide Corporation	$ 248	$ 247	$ 588	$ 489
Other Comprehensive Income, Net of Tax
Translation adjustments	0	(1)	0	(2)
Adjustments to pension and other postretirement benefit plans	14	10	38	30
Total other comprehensive income	14	9	38	28
Comprehensive Income Attributable to Union Carbide Corporation	$ 262	$ 256	$ 626	$ 517