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]
Union Carbide Corporation's Stockholder's Equity, Beginning at Dec. 31, 2013			$ 0		$ 4,442	$ (1,045)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares acquired for constructive retirement	$ 0
Net Income	489				489
Dividends declared					(1,010)
Other comprehensive income	28					28
Union Carbide Corporation's Stockholder's Equity, Ending at Sep. 30, 2014			0	$ 312	3,921	(1,017)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Other					0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		$ 3,216
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,809
Union Carbide Corporation's Stockholder's Equity, Beginning at Dec. 31, 2014			0		3,740	(1,243)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares acquired for constructive retirement	174
Net Income	588				588
Dividends declared					(220)
Other comprehensive income	38					38
Union Carbide Corporation's Stockholder's Equity, Ending at Sep. 30, 2015			$ 0	$ 312	4,122	$ (1,205)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Other					$ 14
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 3,055	$ 3,055