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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 16, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Document Transition Report false    
Entity File Number 000-04604    
Entity Registrant Name Cincinnati Financial Corporation    
Entity Incorporation, State or Country Code OH    
Entity Tax Identification Number 31-0746871    
Entity Address, Address Line One 6200 S. Gilmore Road    
Entity Address, City or Town Fairfield    
Entity Address, State or Province OH    
Entity Address, Postal Zip Code 45014-5141    
City Area Code 513    
Local Phone Number 870-2000    
Title of 12(b) Security Common stock, $2.00 par    
Trading Symbol CINF    
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 false    
Entity Shell Company false    
Entity Public Float     $ 14,988,706,711
Entity Common Stock, Shares Outstanding   156,665,018  
Entity Central Index Key 0000020286    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false    
Documents Incorporated by Reference
Portions of the definitive Proxy Statement for Cincinnati Financial Corporation’s Annual Meeting of Shareholders to be held on May 4, 2024, are incorporated by reference into Part III of this Form 10-K.