v3.26.1
Document and Entity Information - USD ($)
 11 Months Ended
Dec. 31, 2025
Mar. 26, 2026
Cover [Abstract]    
Document Type 10-K  
Amendment Flag false  
Document Period End Date Dec. 31, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus FY  
Entity Registrant Name TCW Steel City Senior Lending BDC  
Entity Central Index Key 0002043133  
Current Fiscal Year End Date --12-31  
Inception Date Feb. 05, 2025  
Entity Well-known Seasoned Issuer No  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
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   12,093,673
Entity Public Float $ 0  
Entity File Number 000-56771  
Entity Tax Identification Number 33-1515587  
Entity Address, Address Line One 200 Clarendon Street  
Entity Address City Or Town Boston  
Entity Address State Or Province MA  
Entity Address Postal Zip Code 02116  
City Area Code 617  
Local Phone Number 936-2275  
Entity Interactive Data Current Yes  
Entity Incorporation State Country Code DE  
Title of Class Class I common shares of beneficial interest, par value $0.01  
Document Annual Report true  
Document Transition Report false  
ICFR Auditor Attestation Flag false  
Document Financial Statement Error Correction false  
Auditor Name Deloitte & Touche LLP  
Auditor Firm ID 34  
Auditor Location Los Angeles, California, United States of America  
Documents Incorporated by Reference

Documents Incorporated by Reference

None.

  
Auditor Opinion

Opinion on the Financial Statements and Financial Highlights

We have audited the accompanying consolidated statement of assets and liabilities of TCW Steel City Senior Lending BDC and subsidiary (the “Company”), including the consolidated schedule of investments, as of December 31, 2025, the related consolidated statements of operations, changes in net assets, cash flows, and financial highlights for the period from February 5, 2025 (inception) to December 31, 2025, and the related notes (collectively referred to as the “financial statements and financial highlights”). In our opinion, the financial statements and financial highlights present fairly, in all material respects, the financial position of the Company as of December 31, 2025, and the results of its operations, changes in net assets, cash flows, and financial highlights for the period from February 5, 2025 (inception) to December 31, 2025, in conformity with accounting principles generally accepted in the United States of America.