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Debt, Summary of Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt [Abstract]    
Principal $ 10,197 $ 11,643
Unamortized discount and issuance costs 88 110
Debt, net 10,109 11,533
Short term debt 37 77
Long term debt 10,072 11,456
Loews Corporation [Member]    
Debt [Abstract]    
Principal 2,300  
Unamortized discount and issuance costs 24  
Debt, net 2,276  
Long term debt 2,276 $ 1,779
CNA Financial [Member]    
Debt [Abstract]    
Principal 2,793  
Unamortized discount and issuance costs 17  
Debt, net 2,776  
Long term debt 2,776  
Boardwalk Pipelines [Member]    
Debt [Abstract]    
Principal 3,487  
Unamortized discount and issuance costs 25  
Debt, net 3,462  
Short term debt 1  
Long term debt 3,461  
Loews Hotels & Co [Member]    
Debt [Abstract]    
Principal 750  
Unamortized discount and issuance costs 8  
Debt, net 742  
Short term debt 16  
Long term debt 726  
Altium Packaging [Member]    
Debt [Abstract]    
Principal 867  
Unamortized discount and issuance costs 14  
Debt, net 853  
Short term debt 20  
Long term debt $ 833