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Cover - USD ($)
 12 Months Ended
Dec. 31, 2023
Mar. 06, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
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    
Title of 12(b) Security Common stock, par value $0.001 per share    
Trading Symbol CION    
Security Exchange Name NYSE    
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 [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 564,737,167
Entity Common Stock, Shares Outstanding   53,844,131  
Documents Incorporated by Reference None.    
Entity Central Index Key 0001534254    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY