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Benefit Plans, Savings Plans and Stock-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2016
Share-based Payment Arrangement, Disclosure [Abstract]        
Company matching contributions to savings plans $ 83 $ 90 $ 102  
Compensation expense $ 33 $ 37 $ 37  
SARs        
Share-based Payment Arrangement, Disclosure [Abstract]        
Vesting period 4 years      
Expiration period 10 years      
Units outstanding (in shares) 1,364,502      
Weighted average exercise price (in dollars per share) $ 42.15      
RSUs        
Share-based Payment Arrangement, Disclosure [Abstract]        
Number of shares received (in shares) 1      
Units forfeited (in shares) 16,528      
RSUs | First 50%        
Share-based Payment Arrangement, Disclosure [Abstract]        
Vesting percentage 50.00%      
RSUs | Second 50%        
Share-based Payment Arrangement, Disclosure [Abstract]        
Vesting percentage 50.00%      
PSUs        
Share-based Payment Arrangement, Disclosure [Abstract]        
Number of shares received (in shares) 1      
PSUs | First 50%        
Share-based Payment Arrangement, Disclosure [Abstract]        
Vesting percentage 50.00%      
PSUs | Second 50%        
Share-based Payment Arrangement, Disclosure [Abstract]        
Vesting percentage 50.00%      
RSUs and PSUs        
Share-based Payment Arrangement, Disclosure [Abstract]        
Units granted (in shares) 223,664      
Weighted average grant date fair value (in dollars per share) $ 47.68      
2016 Loews Plan        
Share-based Payment Arrangement, Disclosure [Abstract]        
Number of shares authorized (in shares)       6,000,000
Number of shares that may be granted to any individual per calendar year (in shares)       500,000
2016 Loews Plan | Maximum        
Share-based Payment Arrangement, Disclosure [Abstract]        
Number of shares authorized (in shares)       3,000,000