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Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2021
Commitments and Contingencies [Abstract]
Commitments and Contingencies	11. 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 March 31, 2021, the potential amount of future payments CNA could be required to pay under these guarantees was approximately $1.6 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.