v3.26.1
Cover Page - shares
3 Months Ended
Mar. 31, 2026
May 01, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Mar. 31, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Entity Registrant Name SLR Private Credit BDC II LLC  
Entity Central Index Key 0001932591  
Securities Act File Number 814-01616  
Entity Tax Identification Number 88-1890628  
Entity Incorporation, State or Country Code DE  
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Address, Address Line One 500 Park Avenue  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10022  
Local Phone Number 993-1670  
City Area Code 212  
Entity Interactive Data Current Yes  
Current Fiscal Year End Date --12-31  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   1,193,638