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COMMITMENTS AND CONTINGENT LIABILITIES (Environmental Matters) (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]    
Accrual for environmental loss contingencies $ 136us-gaap_AccrualForEnvironmentalLossContingencies $ 132us-gaap_AccrualForEnvironmentalLossContingencies
Accrual For Environmental Loss Contingencies Superfund Sites [Member]    
Loss Contingencies [Line Items]    
Accrual for environmental loss contingencies $ 23us-gaap_AccrualForEnvironmentalLossContingencies
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= ucc_AccrualForEnvironmentalLossContingenciesSuperFundSitesMember
$ 22us-gaap_AccrualForEnvironmentalLossContingencies
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= ucc_AccrualForEnvironmentalLossContingenciesSuperFundSitesMember