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Benefit Plans - Savings Plans and Stock-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Share-based Payment Arrangement, Disclosure [Abstract]      
Company matching contributions to savings plans $ 119 $ 110 $ 103
Compensation expense $ 41 $ 39 $ 36
RSUs and PSUs      
Share-based Payment Arrangement, Disclosure [Abstract]      
Number of shares received (in shares) 1    
Number of shares granted (in shares) 136,092    
Weighted average grant date fair value (in dollars per share) $ 84.92    
RSUs and PSUs | Second Anniversary of the Grant Date      
Share-based Payment Arrangement, Disclosure [Abstract]      
Vesting percentage 50.00%    
RSUs and PSUs | Third Anniversary of the Grant Date      
Share-based Payment Arrangement, Disclosure [Abstract]      
Vesting percentage 50.00%    
SARs      
Share-based Payment Arrangement, Disclosure [Abstract]      
Vesting period 7 years    
Expiration period 10 years    
Number of shares outstanding (in shares) 1,237,500    
Weighted average exercise price (in dollars per share) $ 161.11    
Common Stock      
Share-based Payment Arrangement, Disclosure [Abstract]      
Number of shares granted (in shares) 5,462    
Weighted average grant date fair value (in dollars per share) $ 100.12    
RSUs      
Share-based Payment Arrangement, Disclosure [Abstract]      
Number of shares forfeited (in shares) 0    
2025 Loews Plan      
Share-based Payment Arrangement, Disclosure [Abstract]      
Number of shares authorized (in shares) 6,000,000    
2025 Loews Plan | Maximum      
Share-based Payment Arrangement, Disclosure [Abstract]      
Number of shares authorized (in shares) 1,773,495