Consolidated Statements of Equity (USD $) In Millions, unless otherwise specified	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]	Noncontrolling Interest [Member]
Union Carbide Corporation's stockholder's equity at Dec. 31, 2011			$ 0	$ 312	$ 5,253	$ (1,132)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	8				8
Dividends declared					(550)
Other comprehensive income	19					19
Union Carbide Corporation's stockholder's equity at Jun. 30, 2012		3,910	0	312	4,711	(1,113)
Total Equity at Jun. 30, 2012	3,912
Noncontrolling interests at Jun. 30, 2012							2
Union Carbide Corporation's stockholder's equity at Dec. 31, 2012	3,322		0	312	4,355	(1,345)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	132				132
Dividends declared					(169)
Other comprehensive income	29					29
Union Carbide Corporation's stockholder's equity at Jun. 30, 2013	3,314	3,314	0	312	4,318	(1,316)
Total Equity at Jun. 30, 2013	3,316
Noncontrolling interests at Jun. 30, 2013	$ 2						$ 2