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Debt
 9 Months Ended
Sep. 30, 2024
Debt Disclosure [Abstract]  
Debt Debt
In February of 2024, CNA completed a public offering of $500 million aggregate principal amount of its 5.1% senior notes due February 15, 2034 and in May of 2024, CNA repaid at maturity the outstanding $550 million aggregate principal amount of its 4.0% senior notes.

In February of 2024, Boardwalk Pipelines completed a public offering of $600 million aggregate principal amount of its 5.6% senior notes due August 1, 2034. Boardwalk Pipelines intends to use the net proceeds to retire the outstanding $600 million aggregate principal amount of its 5.0% notes due December 2024 at maturity.