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Benefit Plans, Savings Plans and Stock-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2016
Share-based Compensation [Abstract]        
Company matching contributions to savings plans $ 90 $ 102 $ 100  
Compensation expense $ 37 $ 37 $ 35  
SARs [Member]        
Share-based Compensation [Abstract]        
Vesting period 4 years      
Expiration period 10 years      
Units outstanding (in shares) 2,062,256      
Weighted average exercise price (in dollars per share) $ 41.65      
RSUs [Member]        
Share-based Compensation [Abstract]        
Number of shares received (in shares) 1      
Units forfeited (in shares) 0      
RSUs [Member] | First 50% [Member]        
Share-based Compensation [Abstract]        
Vesting percentage 50.00%      
RSUs [Member] | Second 50% [Member]        
Share-based Compensation [Abstract]        
Vesting percentage 50.00%      
PSUs [Member]        
Share-based Compensation [Abstract]        
Number of shares received (in shares) 1      
PSUs [Member] | First 50% [Member]        
Share-based Compensation [Abstract]        
Vesting percentage 50.00%      
PSUs [Member] | Second 50% [Member]        
Share-based Compensation [Abstract]        
Vesting percentage 50.00%      
RSUs and PSUs [Member]        
Share-based Compensation [Abstract]        
Units granted (in shares) 219,571      
Weighted average grant date fair value (in dollars per share) $ 49.99      
2016 Loews Plan [Member]        
Share-based Compensation [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 [Member] | Maximum [Member]        
Share-based Compensation [Abstract]        
Number of shares authorized (in shares)       3,000,000