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Document And Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Feb. 01, 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    
Entity File Number 000-20202    
Entity Registrant Name CREDIT ACCEPTANCE CORP    
Entity Incorporation, State or Country Code MI    
Entity Tax Identification Number 38-1999511    
Entity Address, Address Line One 25505 W. Twelve Mile Road    
Entity Address, City or Town Southfield,    
Entity Address, State or Province MI    
Entity Address, Postal Zip Code 48034-8339    
City Area Code 248    
Local Phone Number 353-2700    
Title of 12(b) Security Common Stock, $.01 par value    
Trading Symbol CACC    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 3,237.0
Entity Common Stock, Shares Outstanding   12,302,955  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant's definitive proxy statement pertaining to the registrant’s 2024 annual meeting of shareholders (the “Proxy Statement”) to be filed pursuant to Regulation 14A are incorporated herein by reference into Part III of this Annual Report on Form 10-K (this “Form 10-K”).
    
Entity Central Index Key 0000885550    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023    
Amendment Flag false