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Debt (Details) - Senior Notes - USD ($)
$ in Millions
May 31, 2024
Feb. 29, 2024
CNA Financial | 5.1% Senior Notes Due February 15, 2034    
Debt [Abstract]    
Face amount   $ 500
Interest rate (as a percent)   5.10%
CNA Financial | 4.0% Senior Notes Due May, 2024    
Debt [Abstract]    
Interest rate (as a percent) 4.00%  
Long term debt $ 550  
Boardwalk Pipelines | 5.6% Senior Notes Due August 1, 2034    
Debt [Abstract]    
Face amount   $ 600
Interest rate (as a percent)   5.60%
Boardwalk Pipelines | 5.0% Notes Due December 2024    
Debt [Abstract]    
Interest rate (as a percent)   5.00%
Long term debt   $ 600