XML 17 R1.htm IDEA: XBRL DOCUMENT v3.24.0.1
COVER - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Feb. 02, 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 1-06541    
Entity Registrant Name LOEWS CORP    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 13-2646102    
Entity Address, Address Line One 9 West 57th Street    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10019-2714    
City Area Code 212    
Local Phone Number 521-2000    
Title of 12(b) Security Common stock, par value $0.01 per share    
Trading Symbol L    
Security Exchange Name NYSE    
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     $ 10,926
Entity Common Stock, Shares Outstanding   222,201,139  
Documents Incorporated by Reference
Portions of the registrant’s definitive proxy statement for the 2024 annual meeting of shareholders, intended to be filed by the registrant with the Commission not later than 120 days after the close of its fiscal year, are incorporated by reference into Part III of this Report.
    
Entity Central Index Key 0000060086    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY