v3.25.2
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2025
Aug. 14, 2025
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Document Quarterly Report true  
Document Transition Report false  
Entity Registrant Name CCS IX PORTFOLIO HOLDINGS, LLC  
Entity Central Index Key 0002017636  
Current Fiscal Year End Date --12-31  
Securities Act File Number 000-56718  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 99-2441832  
Entity Address, Address Line One 11100 Santa Monica Blvd  
Entity Address, Address Line Two Suite 2000  
Entity Address, City or Town Los Angeles  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 90025  
City Area Code 310  
Local Phone Number 235-5900  
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 true  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   10