XML 29 R15.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Legal Proceedings, Contingencies and Guarantees | 12 Months Ended
--- | ---
Dec. 31, 2021
Legal Proceedings, Commitments and Contingencies, and Guarantees [Abstract] |
Legal Proceedings, Contingencies and Guarantees | Legal Proceedings, Contingencies and Guarantees The Company is a party to various claims and litigation incidental to its business, which, based on the facts and circumstances currently known, are not material to the Company's results of operations or financial position. Data Breach-related Contingency As previously disclosed, the Company sustained a sophisticated cybersecurity attack in March 2021 involving ransomware. The Company’s investigation revealed that an unauthorized third party copied some personal information relating to certain current and former employees, contractor workers and their dependents and certain other persons, including some policyholders. In July 2021, we provided notifications to the impacted individuals and to regulators, in accordance with applicable law. The Company may be subject to subsequent investigations, fines or penalties, as well as other legal claims and actions, related to the foregoing. The likelihood is reasonably possible, but the amount of such fines, penalties or costs, if any, cannot be estimated at this time. Based on the information currently known, we do not believe that the March 2021 cybersecurity attack will have a material impact on our business, results of operations or financial condition, but no assurances can be given as we continue to assess the full impact from the incident, including costs, expenses and insurance coverage. Guarantees The Company has provided guarantees, if the primary obligor fails to perform, to holders of structured settlement annuities issued by a previously owned subsidiary. As of December 31, 2021, the potential amount of future payments the Company could be required to pay under these guarantees was approximately $1.6 billion, which will be paid over the lifetime of the annuitants. The Company does not believe any payment is likely under these guarantees, as the Company is the beneficiary of a trust that must be maintained at a level that approximates the discounted reserves for these annuities.

X
- Definition Legal Proceedings, Commitments and Contingencies, and Guarantees [Abstract] + References No definition available. + Details
Name: | cna_LegalProceedingsCommitmentsandContingenciesandGuaranteesAbstract
Namespace Prefix: | cna_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Legal Proceedings, Commitments and Contingencies, and Guarantees [Text Block] + References No definition available. + Details
Name: | cna_LegalProceedingsCommitmentsandContingenciesandGuaranteesTextBlock
Namespace Prefix: | cna_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration