v3.25.2
Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenues [Abstract]        
Total revenues from contracts with customers $ 769 $ 711 $ 1,615 $ 1,421
Other revenues 26 25 52 51
Operating revenues and other 795 736 1,667 1,472
CNA Financial | Non-insurance warranty        
Disaggregation of Revenues [Abstract]        
Total revenues from contracts with customers 398 404 795 811
Boardwalk Pipelines | Transportation and storage of natural gas and NGLs and other services        
Disaggregation of Revenues [Abstract]        
Total revenues from contracts with customers 523 467 1,132 968
Loews Hotels & Co | Lodging and related services        
Disaggregation of Revenues [Abstract]        
Total revenues from contracts with customers $ 246 $ 244 $ 483 $ 453