Consolidated Statements of Equity - USD ($) $ in Millions	Total	Union Carbide Corporation's Stockholder's Equity [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss), Net of Tax [Member]
Balance at beginning of year at Dec. 31, 2014			$ 0	$ 312	$ 3,740	$ (1,243)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income Attributable to Union Carbide Corporation	$ 195				195
Dividends declared					(220)
Other Comprehensive Income (Loss), Net of Tax	13					13
Balance at end of period at Mar. 31, 2015			0	312	3,715	(1,230)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		$ 2,797
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,301
Balance at beginning of year at Dec. 31, 2015			0	138	3,391	(1,228)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income Attributable to Union Carbide Corporation	240				240
Dividends declared					(200)
Other Comprehensive Income (Loss), Net of Tax	11					11
Balance at end of period at Mar. 31, 2016			$ 0	$ 138	$ 3,431	$ (1,217)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 2,352	$ 2,352