Consolidated Statements of Equity Consolidated Statements of Equity (Parentheticals) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Dividend, Noncash, Ownership interest in Subsidiary	$ 70	$ 0

Dividend, Noncash, Ownership Interest in Subsidiary

No definition available.

Name:	ucc_DividendNoncashOwnershipinterestinSubsidiary
Namespace Prefix:	ucc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant