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Debt (Details) - Senior Notes - USD ($) $ in Millions | May 31, 2024 | Feb. 29, 2024
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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

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