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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

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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