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Cover Page - shares
 3 Months Ended
Mar. 31, 2023
Apr. 25, 2023
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2023  
Document Transition Report false  
Securities Act File Number 814-00663  
Entity Registrant Name ARES CAPITAL CORPORATION  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 33-1089684  
Entity Address, Address Line One 245 Park Avenue  
Entity Address, Address Line Two 44th Floor  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10167  
City Area Code 212  
Local Phone Number 750-7300  
Title of 12(b) Security Common stock, par value $0.001 per share  
Trading Symbol ARCC  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   544,581,080
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus Q1  
Entity Central Index Key 0001287750