v3.25.1
Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2025
May 09, 2025
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2025  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2025  
Document Quarterly Report true  
Document Transition Report false  
Entity Registrant Name Diameter Credit Company  
Entity Central Index Key 0001916099  
Current Fiscal Year End Date --12-31  
Securities Act File Number 000-56624  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 88-1389797  
Entity Address, Address Line One 55 Hudson Yards  
Entity Address, Address Line Two 29th Floor  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10001  
City Area Code 212  
Local Phone Number 655-1419  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   29,037,746