Document and Entity Information
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Document and Entity Information [Abstract]  
Entity Registrant Name UNION CARBIDE CORP /NEW/
Entity Central Index Key 0000100790
Current Fiscal Year End Date --12-31
Entity Filer Category Non-accelerated Filer
Document Type 10-K
Document Period End Date Dec. 31, 2017
Document Fiscal Year Focus 2017
Document Fiscal Period Focus FY
Amendment Flag false
Entity Common Stock, Shares Outstanding | shares 935.51
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Public Float | $ $ 0