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Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2025
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies CNA Guarantees CNA has provided guarantees, if the primary obligor fails to perform, to holders of structured settlement annuities issued by a previously owned subsidiary. As of September 30, 2025, the potential amount of future payments CNA could be required to pay under these guarantees was approximately $1.9 billion, which will be paid over the lifetime of the annuitants. CNA does not believe any payment is likely under these guarantees, as CNA is the beneficiary of a trust that must be maintained at a level that approximates the discounted reserves for these annuities. Boardwalk Pipelines Boardwalk Pipelines’ future capital commitments are comprised of binding commitments under purchase orders for materials ordered but not received. As of September 30, 2025, the commitments totaled approximately $273 million, which are expected to be settled through 2028.