XML 8 R1.htm IDEA: XBRL DOCUMENT v3.25.2
Document and Entity Information
Jun. 24, 2025
Document And Entity Information [Line Items]  
Entity Registrant Name TRI-CONTINENTAL Corp
Entity Incorporation State Country Code MD
Amendment Flag false
Entity Central Index Key 0000099614
Document Type 8-K
Document Period End Date Jun. 24, 2025
Entity File Number 811-00266
Entity Tax Identification Number 13-5441850
Entity Address, Address Line One 290 Congress Street
Entity Address, City or Town Boston
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02210
City Area Code (800)
Local Phone Number 345-6611
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Stock
Trading Symbol TY
Security Exchange Name NYSE
Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Preferred Stock
Trading Symbol TYPR
Security Exchange Name NYSE