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Cover - USD ($)
 12 Months Ended
Dec. 31, 2024
Mar. 05, 2025
Jun. 28, 2024
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Securities Act File Number 000-54755    
Entity Registrant Name CĪON Investment Corporation    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 45-3058280    
Entity Address, Address Line One 100 Park Avenue    
Entity Address, Address Line Two 25th Floor    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10017    
City Area Code (212)    
Local Phone Number 418-4700    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 645,541,052
Entity Common Stock, Shares Outstanding   53,026,694  
Documents Incorporated by Reference None.    
Central Index Key 0001534254    
Amendment Flag false    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Common Stock      
Document Information [Line Items]      
Title of 12(b) Security Common stock, par value $0.001 per share    
Trading Symbol CION    
Security Exchange Name NYSE    
2029 Notes      
Document Information [Line Items]      
Title of 12(b) Security 7.50% Notes due 2029    
Trading Symbol CICB    
Security Exchange Name NYSE