XML 56 R41.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Investments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
Investments [Abstract] |
Net investment income | The significant components of Net investment income are presented in the following table.
Years ended December 31 |  |  |  |  |
(In millions) | 2024 |  | 2023 |  | 2022
Fixed maturity securities | $ | 2,051 |  |  | $ | 1,941 |  |  | $ | 1,787 |
Equity securities | 82 |  |  | 63 |  |  | 23 |
Limited partnership investments | 271 |  |  | 174 |  |  | (12) |
Mortgage loans | 58 |  |  | 58 |  |  | 54 |
Short-term investments | 87 |  |  | 75 |  |  | 16 |
Trading portfolio | 2 |  |  | 4 |  |  | 4 |
Other | 31 |  |  | 28 |  |  | 5 |
Gross investment income | 2,582 |  |  | 2,343 |  |  | 1,877 |
Investment expense | (85) |  |  | (79) |  |  | (72) |
Net investment income | $ | 2,497 |  |  | $ | 2,264 |  |  | $ | 1,805 |
Net investment income (loss) recognized due to the change in fair value of common stock held as of December 31, 2024, 2023 and 2022 | $ | 28 |  |  | $ | 11 |  |  | $ | 47 |
Net realized investment gains (losses) | Net investment gains (losses) are presented in the following table.
Years ended December 31 |  |  |  |  |
(In millions) | 2024 |  | 2023 |  | 2022
Net investment gains (losses): |  |  |  |  |
Fixed maturity securities: |  |  |  |  |
Gross gains | $ | 48 |  |  | $ | 75 |  |  | $ | 120 |
Gross losses | (150) |  |  | (166) |  |  | (261) |
Net investment gains (losses) on fixed maturity securities | (102) |  |  | (91) |  |  | (141) |
Equity securities | 21 |  |  | 4 |  |  | (116) |
Derivatives | — |  |  | (1) |  |  | 64 |
Mortgage loans | — |  |  | (11) |  |  | (8) |
Short-term investments and other | — |  |  | — |  |  | 2 |
Net investment gains (losses) | $ | (81) |  |  | $ | (99) |  |  | $ | (199) |
Net investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock held as of December 31, 2024, 2023 and 2022 | $ | 19 |  |  | $ | 14 |  |  | $ | (75) |
Components of net other than temporary impairment losses recognized in earnings by asset type | The table includes losses (gains) on securities with an intention to sell and changes in the allowance for credit losses on securities since acquisition date.
Years ended December 31 |  |  |  |  |
(In millions) | 2024 |  | 2023 |  | 2022
Fixed maturity securities available-for-sale: |  |  |  |  |
Corporate and other bonds | $ | 34 |  |  | $ | 33 |  |  | $ | 62 |
Asset-backed | 29 |  |  | 11 |  |  | — |
Impairment losses (gains) recognized in earnings | $ | 63 |  |  | $ | 44 |  |  | $ | 62 |
Summary of fixed maturity securities | The following tables present a summary of fixed maturity securities.
December 31, 2024 | Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Allowance for Credit Losses |  | Estimated Fair Value
(In millions) |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |  |  |  |  |
Corporate and other bonds | $ | 25,839 |  |  | $ | 423 |  |  | $ | 1,305 |  |  | $ | 13 |  |  | $ | 24,944 |
States, municipalities and political subdivisions | 7,396 |  |  | 243 |  |  | 835 |  |  | — |  |  | 6,804 |
Asset-backed: |  |  |  |  |  |  |  |  |
Residential mortgage-backed | 3,725 |  |  | 7 |  |  | 488 |  |  | — |  |  | 3,244 |
Commercial mortgage-backed | 1,830 |  |  | 11 |  |  | 142 |  |  | 18 |  |  | 1,681 |
Other asset-backed | 3,770 |  |  | 24 |  |  | 239 |  |  | 14 |  |  | 3,541 |
Total asset-backed | 9,325 |  |  | 42 |  |  | 869 |  |  | 32 |  |  | 8,466 |
U.S. Treasury and obligations of government-sponsored enterprises | 220 |  |  | 1 |  |  | 1 |  |  | — |  |  | 220 |
Foreign government | 701 |  |  | 6 |  |  | 30 |  |  | — |  |  | 677 |
Redeemable preferred stock | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total fixed maturity securities available-for-sale | 43,481 |  |  | 715 |  |  | 3,040 |  |  | 45 |  |  | 41,111 |
Total fixed maturity securities trading | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total fixed maturity securities | $ | 43,481 |  |  | $ | 715 |  |  | $ | 3,040 |  |  | $ | 45 |  |  | $ | 41,111 |
December 31, 2023 | Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Allowance for Credit Losses |  | Estimated Fair Value
(In millions) |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |  |  |  |  |
Corporate and other bonds | $ | 25,020 |  |  | $ | 597 |  |  | $ | 1,345 |  |  | $ | 4 |  |  | $ | 24,268 |
States, municipalities and political subdivisions | 7,713 |  |  | 382 |  |  | 703 |  |  | — |  |  | 7,392 |
Asset-backed: |  |  |  |  |  |  |  |  |
Residential mortgage-backed | 3,411 |  |  | 16 |  |  | 425 |  |  | — |  |  | 3,002 |
Commercial mortgage-backed | 1,862 |  |  | 7 |  |  | 230 |  |  | 8 |  |  | 1,631 |
Other asset-backed | 3,515 |  |  | 13 |  |  | 256 |  |  | 4 |  |  | 3,268 |
Total asset-backed | 8,788 |  |  | 36 |  |  | 911 |  |  | 12 |  |  | 7,901 |
U.S. Treasury and obligations of government-sponsored enterprises | 152 |  |  | 1 |  |  | 2 |  |  | — |  |  | 151 |
Foreign government | 741 |  |  | 6 |  |  | 34 |  |  | — |  |  | 713 |
Redeemable preferred stock | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total fixed maturity securities available-for-sale | 42,414 |  |  | 1,022 |  |  | 2,995 |  |  | 16 |  |  | 40,425 |
Total fixed maturity securities trading | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total fixed maturity securities | $ | 42,414 |  |  | $ | 1,022 |  |  | $ | 2,995 |  |  | $ | 16 |  |  | $ | 40,425 |
Debt securities, available-for-sale, unrealized loss position, fair value | The following tables present the estimated fair value and gross unrealized losses of available-for-sale fixed maturity securities in a gross unrealized loss position for which an allowance for credit loss has not been recorded, by the length of time in which the securities have continuously been in that position.
| Less than 12 Months |  | 12 Months or Longer |  | Total
December 31, 2024 | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses
(In millions) |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |
Corporate and other bonds | $ | 5,846 |  |  | $ | 165 |  |  | $ | 10,388 |  |  | $ | 1,140 |  |  | $ | 16,234 |  |  | $ | 1,305 |
States, municipalities and political subdivisions | 1,247 |  |  | 52 |  |  | 2,967 |  |  | 783 |  |  | 4,214 |  |  | 835 |
Asset-backed: |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed | 849 |  |  | 22 |  |  | 2,010 |  |  | 466 |  |  | 2,859 |  |  | 488 |
Commercial mortgage-backed | 230 |  |  | 3 |  |  | 988 |  |  | 139 |  |  | 1,218 |  |  | 142 |
Other asset-backed | 680 |  |  | 21 |  |  | 1,557 |  |  | 218 |  |  | 2,237 |  |  | 239 |
Total asset-backed | 1,759 |  |  | 46 |  |  | 4,555 |  |  | 823 |  |  | 6,314 |  |  | 869 |
U.S. Treasury and obligations of government-sponsored enterprises | 49 |  |  | 1 |  |  | 41 |  |  | — |  |  | 90 |  |  | 1 |
Foreign government | 118 |  |  | 3 |  |  | 368 |  |  | 27 |  |  | 486 |  |  | 30 |
Total | $ | 9,019 |  |  | $ | 267 |  |  | $ | 18,319 |  |  | $ | 2,773 |  |  | $ | 27,338 |  |  | $ | 3,040 |
| Less than 12 Months |  | 12 Months or Longer |  | Total
December 31, 2023 | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses
(In millions) |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |
Corporate and other bonds | $ | 1,943 |  |  | $ | 37 |  |  | $ | 13,406 |  |  | $ | 1,308 |  |  | $ | 15,349 |  |  | $ | 1,345 |
States, municipalities and political subdivisions | 598 |  |  | 18 |  |  | 3,104 |  |  | 685 |  |  | 3,702 |  |  | 703 |
Asset-backed: |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed | 233 |  |  | 4 |  |  | 2,212 |  |  | 421 |  |  | 2,445 |  |  | 425 |
Commercial mortgage-backed | 200 |  |  | 5 |  |  | 1,184 |  |  | 225 |  |  | 1,384 |  |  | 230 |
Other asset-backed | 392 |  |  | 8 |  |  | 1,869 |  |  | 248 |  |  | 2,261 |  |  | 256 |
Total asset-backed | 825 |  |  | 17 |  |  | 5,265 |  |  | 894 |  |  | 6,090 |  |  | 911 |
U.S. Treasury and obligations of government-sponsored enterprises | 65 |  |  | 1 |  |  | 23 |  |  | 1 |  |  | 88 |  |  | 2 |
Foreign government | 52 |  |  | 1 |  |  | 450 |  |  | 33 |  |  | 502 |  |  | 34 |
Total | $ | 3,483 |  |  | $ | 74 |  |  | $ | 22,248 |  |  | $ | 2,921 |  |  | $ | 25,731 |  |  | $ | 2,995 |
The following table presents the estimated fair value and gross unrealized losses of available-for-sale fixed maturity securities in a gross unrealized loss position for which an allowance for credit loss has not been recorded, by ratings distribution.
| December 31, 2024 |  | December 31, 2023
(In millions) | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses
U.S. Government, Government agencies and Government-sponsored enterprises | $ | 2,567 |  |  | $ | 373 |  |  | $ | 2,273 |  |  | $ | 309 |
AAA | 1,830 |  |  | 283 |  |  | 1,524 |  |  | 261 |
AA | 4,257 |  |  | 730 |  |  | 3,817 |  |  | 658 |
A | 6,340 |  |  | 582 |  |  | 5,652 |  |  | 517 |
BBB | 11,548 |  |  | 980 |  |  | 11,523 |  |  | 1,095 |
Non-investment grade | 796 |  |  | 92 |  |  | 942 |  |  | 155 |
Total | $ | 27,338 |  |  | $ | 3,040 |  |  | $ | 25,731 |  |  | $ | 2,995 |
Debt securities, available-for-sale, allowance for credit loss |
(In millions) | Corporate and other bonds |  | Asset-backed |  | Total
Allowance for credit losses: |  |  |  |  |
Balance as of January 1, 2024 | $ | 4 |  |  | $ | 12 |  |  | $ | 16 |
Additions to the allowance for credit losses: |  |  |  |  |
Securities for which credit losses were not previously recorded | 9 |  |  | 18 |  |  | 27 |
Available-for-sale securities accounted for as PCD assets | 4 |  |  | — |  |  | 4 |
Reductions to the allowance for credit losses: |  |  |  |  |
Securities sold during the period (realized) | 3 |  |  | 1 |  |  | 4 |
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis | 1 |  |  | — |  |  | 1 |
Write-offs charged against the allowance | — |  |  | 9 |  |  | 9 |
Recoveries of amounts previously written off | — |  |  | — |  |  | — |
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period | — |  |  | 12 |  |  | 12 |
Balance as of December 31, 2024 | $ | 13 |  |  | $ | 32 |  |  | $ | 45 |
(In millions) | Corporate and other bonds |  | Asset-backed |  | Total
Allowance for credit losses: |  |  |  |  |
Balance as of January 1, 2023 | $ | — |  |  | $ | 1 |  |  | $ | 1 |
Additions to the allowance for credit losses: |  |  |  |  |
Securities for which credit losses were not previously recorded | 10 |  |  | 7 |  |  | 17 |
Available-for-sale securities accounted for as PCD assets | 22 |  |  | — |  |  | 22 |
Reductions to the allowance for credit losses: |  |  |  |  |
Securities sold during the period (realized) | 6 |  |  | — |  |  | 6 |
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis | 8 |  |  | — |  |  | 8 |
Write-offs charged against the allowance | 15 |  |  | — |  |  | 15 |
Recoveries of amounts previously written off | — |  |  | — |  |  | — |
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period | 1 |  |  | 4 |  |  | 5 |
Balance as of December 31, 2023 | $ | 4 |  |  | $ | 12 |  |  | $ | 16 |
Contractual maturity | The following table presents available-for-sale fixed maturity securities by contractual maturity.
December 31 | 2024 |  | 2023
(In millions) | Cost or Amortized Cost |  | Estimated Fair Value |  | Cost or Amortized Cost |  | Estimated Fair Value
Due in one year or less | $ | 1,761 |  |  | $ | 1,753 |  |  | $ | 1,121 |  |  | $ | 1,091 |
Due after one year through five years | 11,678 |  |  | 11,403 |  |  | 11,563 |  |  | 11,180 |
Due after five years through ten years | 13,134 |  |  | 12,415 |  |  | 13,359 |  |  | 12,573 |
Due after ten years | 16,908 |  |  | 15,540 |  |  | 16,371 |  |  | 15,581 |
Total | $ | 43,481 |  |  | $ | 41,111 |  |  | $ | 42,414 |  |  | $ | 40,425 |
Financing receivable credit quality indicators | The following table presents the amortized cost basis of mortgage loans for each credit quality indicator by year of origination. The primary credit quality indicators utilized are debt service coverage ratios (DSCR) and loan-to-value ratios (LTV).
December 31, 2024 | Mortgage Loans Amortized Cost Basis by Origination Year (1)
(In millions) | 2024 |  | 2023 |  | 2022 |  | 2021 |  | 2020 |  | Prior |  | Total
DSCR ≥1.6x |  |  |  |  |  |  |  |  |  |  |  |  |
LTV less than 55% | $ | — |  |  | $ | 34 |  |  | $ | 9 |  |  | $ | — |  |  | $ | 60 |  |  | $ | 169 |  |  | $ | 272 |
LTV 55% to 65% | — |  |  | — |  |  | 15 |  |  | 11 |  |  | 4 |  |  | 12 |  |  | 42
LTV greater than 65% | — |  |  | 13 |  |  | 30 |  |  | 12 |  |  | — |  |  | — |  |  | 55
DSCR 1.2x - 1.6x |  |  |  |  |  |  |  |  |  |  |  |  |
LTV less than 55% | 49 |  |  | 28 |  |  | 5 |  |  | 2 |  |  | 49 |  |  | 71 |  |  | 204
LTV 55% to 65% | 53 |  |  | 30 |  |  | 21 |  |  | 30 |  |  | 20 |  |  | 39 |  |  | 193
LTV greater than 65% | — |  |  | — |  |  | 46 |  |  | — |  |  | — |  |  | — |  |  | 46
DSCR ≤1.2 |  |  |  |  |  |  |  |  |  |  |  |  |
LTV less than 55% | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 21 |  |  | 21
LTV 55% to 65% | — |  |  | 22 |  |  | 75 |  |  | — |  |  | — |  |  | 20 |  |  | 117
LTV greater than 65% | — |  |  | — |  |  | 35 |  |  | 21 |  |  | — |  |  | 48 |  |  | 104
Total | $ | 102 |  |  | $ | 127 |  |  | $ | 236 |  |  | $ | 76 |  |  | $ | 133 |  |  | $ | 380 |  |  | $ | 1,054 |
(1) The values in the table above reflect DSCR on a standardized amortization period and LTV based on the most recent appraised values trended forward using changes in a commercial real estate price index.

X
- Definition Components Of Net Other Than Temporary Impairment Losses Recognized In Earnings By Asset Type + References No definition available. + Details
Name: | cna_ComponentsOfNetOtherThanTemporaryImpairmentLossesRecognizedInEarningsByAssetTypeTableTextBlock
Namespace Prefix: | cna_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of investment income derived from investments in debt and equity securities consisting of interest income earned from investments in debt securities and on cash and cash equivalents, dividend income from investments in equity securities, and income or expense derived from the amortization of investment related discounts or premiums, respectively. This table includes realized gains (losses) on trading securities. + References No definition available. + Details
Name: | cna_NetInvestmentIncomeTableTextBlock
Namespace Prefix: | cna_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-6 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-4 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 29 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-29 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_FinancingReceivableCreditQualityIndicatorsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of realized gains and losses on investments reported in the statement of income. + References No definition available. + Details
Name: | us-gaap_RealizedGainLossOnInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6B + Details
Name: | us-gaap_TradingSecuritiesAndCertainTradingAssetsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration