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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 12, 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 001-10898    
Registrant name Travelers Companies, Inc.    
Entity incorporation, state MN    
Entity tax identification number 41-0518860    
Entity address, address line one 485 Lexington Avenue    
Entity address, city New York    
Entity address, state NY    
Entity address, postal zip code 10017    
City area code 917    
Local phone number 778-6000    
Title of 12(b) security Common stock, without par value    
Trading symbol TRV    
Security exchange name NYSE    
Well-known seasoned issuer Yes    
Voluntary filers No    
Entity current reporting status Yes    
Entity interactive data current Yes    
Filer category Large Accelerated Filer    
Entity small business false    
Entity emerging growth company false    
ICFR auditor attestation flag true    
Section 12(b) correction of an error false    
Entity shell company false    
Entity public float     $ 39,615,360,010
Common stock shares outstanding   229,125,844  
Documents incorporated by reference
Portions of the Registrant’s Proxy Statement relating to the 2024 Annual Meeting of Shareholders are incorporated by reference into Part III of this report.
    
Central index key 0000086312    
Current fiscal year end date --12-31    
Amendment flag false    
Document fiscal year focus 2023    
Document fiscal period focus FY