XML 38 R27.htm IDEA: XBRL DOCUMENT
v3.25.1

Claim and Claim Adjustment Expense Reserves (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2025
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items] |
Schedule of liability for unpaid claims and claims adjustment expense | The following table presents a reconciliation between beginning and ending claim and claim adjustment expense reserves.
Three months ended March 31 |  |  |
(In millions) | 2025 |  | 2024
Reserves, beginning of year: |  |  |
Gross | $ | 24,976 |  |  | $ | 23,304 |
Ceded | 5,713 |  |  | 5,141 |
Net reserves, beginning of year | 19,263 |  |  | 18,163 |
Net incurred claim and claim adjustment expenses: |  |  |
Provision for insured events of current year | 1,650 |  |  | 1,502 |
Increase (decrease) in provision for insured events of prior years | 80 |  |  | (6) |
Amortization of discount | 10 |  |  | 10 |
Total net incurred (1) | 1,740 |  |  | 1,506 |
Net payments attributable to: |  |  |
Current year events | (80) |  |  | (113) |
Prior year events | (1,212) |  |  | (1,168) |
Total net payments | (1,292) |  |  | (1,281) |
Foreign currency translation adjustment and other | 53 |  |  | (41) |
Net reserves, end of period | 19,764 |  |  | 18,347 |
Ceded reserves, end of period | 5,817 |  |  | 5,241 |
Gross reserves, end of period | $ | 25,581 |  |  | $ | 23,588 |
(1) Total net incurred does not agree to Insurance claims and policyholders' benefits as reflected on the Condensed Consolidated Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting and uncollectible reinsurance, benefit expenses related to future policy benefits and policyholders' dividends, which are not reflected in the table above.
Net prior year development | The following table presents development recorded for the Specialty, Commercial, International and Corporate & Other segments.
Three months ended March 31 |  |  |
(In millions) | 2025 |  | 2024
Pretax (favorable) unfavorable development: |  |  |
Specialty | $ | 10 |  |  | $ | (5) |
Commercial | 51 |  |  | (2) |
International | — |  |  | — |
Corporate & Other | 22 |  |  | — |
Total pretax (favorable) unfavorable development | $ | 83 |  |  | $ | (7) |
Specialty |
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items] |
Net prior year claim and allocated claim adjustment expense reserve development | The following table presents further detail of the development recorded for the Specialty segment.
Three months ended March 31 |  |  |
(In millions) | 2025 |  | 2024
Pretax (favorable) unfavorable development: |  |  |
Medical Professional Liability | $ | — |  |  | $ | — |
Other Professional Liability and Management Liability | — |  |  | — |
Surety | — |  |  | (18) |
Warranty | 10 |  |  | 13 |
Other | — |  |  | — |
Total pretax (favorable) unfavorable development | $ | 10 |  |  | $ | (5) |
Commercial |
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items] |
Net prior year claim and allocated claim adjustment expense reserve development | The following table presents further detail of the development recorded for the Commercial segment.
Three months ended March 31 |  |  |
(In millions) | 2025 |  | 2024
Pretax (favorable) unfavorable development: |  |  |
Commercial Auto | $ | 50 |  |  | $ | — |
General Liability | — |  |  | — |
Workers' Compensation | 1 |  |  | (2) |
Property and Other | — |  |  | — |
Total pretax (favorable) unfavorable development | $ | 51 |  |  | $ | (2) |
International |
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items] |
Net prior year claim and allocated claim adjustment expense reserve development | The following table presents further detail of the development recorded for the International segment.
Three months ended March 31 |  |  |
(In millions) | 2025 |  | 2024
Pretax (favorable) unfavorable development: |  |  |
Commercial | $ | — |  |  | $ | — |
Specialty | — |  |  | — |
Other | — |  |  | — |
Total pretax (favorable) unfavorable development | $ | — |  |  | $ | — |

X
- Definition [Line Items] for Net Incurred Claim and Claim Adjustment Expense [Table] + References No definition available. + Details
Name: | cna_NetIncurredClaimandClaimAdjustmentExpenseLineItems
Namespace Prefix: | cna_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Pretax Favorable Unfavorable Net Prior Year Claim And Allocated Claim Adjustment Expense Reserve Development [Table Text Block] + References No definition available. + Details
Name: | cna_NetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveAndPremiumDevelopmentTableTextBlock
Namespace Prefix: | cna_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net prior year claim and allocated claim adjustment expense reserve development + References No definition available. + Details
Name: | cna_NetprioryearclaimandallocatedclaimadjustmentexpensereservedevelopmentTableTextBlock
Namespace Prefix: | cna_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the activity in the reserve for settling insured claims and expenses incurred in the claims settlement process for the period. The estimated liability includes the amount of money that will be required for future payments of (a) claims that have been reported to the insurer, (b) claims related to insured events that have occurred but that have not been reported to the insurer as of the date the liability is estimated, and (c) claim adjustment expenses. Claim adjustment expenses include costs incurred in the claim settlement process such as legal fees; outside adjuster fees; and costs to record, process, and adjust claims. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 + Details
Name: | us-gaap_ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cna_SpecialtySegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cna_CommercialSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cna_InternationalSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |