v3.26.1
Document and Entity Information
Jun. 16, 2026
Document And Entity Information [Line Items]  
Document Type 8-K
Document Period End Date Jun. 16, 2026
Entity Registrant Name TRI-CONTINENTAL Corp
Entity Incorporation State Country Code MD
Entity File Number 811-00266
Entity Tax Identification Number 13-5441850
Entity Address Address Line 1 290 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
Entity Central Index Key 0000099614
Amendment Flag 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