Document and Entity Information
9 Months Ended
Sep. 30, 2018
Document and Entity Information  
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-Q
Document Period End Date Sep. 30, 2018
Document Fiscal Year Focus 2018
Document Fiscal Period Focus Q3
Amendment Flag false
Entity Common Stock, Shares Outstanding 935.51
Entity Small Business false
Entity Emerging Growth Company false