v3.25.2
Cover - shares
shares in Millions
6 Months Ended
Jun. 30, 2025
Jul. 25, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-33458  
Entity Registrant Name TERADATA CORPORATION  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 75-3236470  
Entity Address, Address Line One 17095 Via Del Campo  
Entity Address, City or Town San Diego  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 92127  
City Area Code 866  
Local Phone Number 548-8348  
Title of 12(b) Security Common Stock, $0.01 par value  
Trading Symbol TDC  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   94.5
Amendment Flag false  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus (Q1,Q2,Q3,FY) Q2  
Entity Central Index Key 0000816761  
Current Fiscal Year End Date --12-31