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, 2015			$ 0	$ 138	$ 3,391	$ (1,228)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income Attributable to Union Carbide Corporation	$ 413				413
Dividends declared					(400)
Other Comprehensive Income (Loss), Net of Tax	21					21
Balance at end of period at Jun. 30, 2016			0	138	3,405	(1,207)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Other					1
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		$ 2,336
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,798
Balance at beginning of year at Dec. 31, 2016			0	138	2,980	(1,320)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income Attributable to Union Carbide Corporation	355				355
Dividends declared					(350)
Other Comprehensive Income (Loss), Net of Tax	27					27
Balance at end of period at Jun. 30, 2017			$ 0	$ 138	2,986	$ (1,293)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Other					$ 1
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,831	$ 1,831