| **Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) shares in Thousands, $ in Millions**                 | 12 Months Ended                              |
|-----------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------|
||
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                  |                                         |   |   |
| Accounting Standards Update [Extensible Enumeration]                                                                              | Accounting Standards Update 2018-12 [Member] |   |   |
| Anticipated amounts due from insureds related to losses under deductible policies                                                 | $ 1,200                                      | $ 1,100 |   |
| Structured settlement annuities, interest rate, low end                                                                           | 6.40%                                        | 6.40% |   |
| Discounted reserves for unfunded structured settlements                                                                           | $ 465                                        | $ 485 |   |
| Discounted reserves for unfunded structure settlements, discount amount                                                           | 559                                          | 590 |   |
| Amount of interest recognized on the discounted reserves of unfunded structured settlements                                       | $ 34                                         | $ 36 | $ 36 |
| Interest rates at which workers' compensation lifetime claim reserves are discounted at                                           | 3.50%                                        | 3.50% |   |
| Workers' compensation liability                                                                                                   | $ 196                                        | $ 211 |   |
| Amount of interest accretion recognized on the discounted reserves of workers’ compensation lifetime claim reserves         | $ 9                                          | 9 | $ 12 |
| Future policy benefit reserves, cash flows projected to occur beyond tenor with market-observable rates available, grading period | 10 years                                     |   |   |
| Liability balance for guaranty fund                                                                                               | $ 84                                         | $ 74 |   |
| Percentage of billed receivables compared to total reinsurance receivable                                                         | 5.00%                                        |   |   |
| Policyholder dividends, rate on policy earnings                                                                                   | 2.00%                                        | 2.00% | 1.00% |
| Foreign currency transaction gain (loss), before tax                                                                              | $ 9                                          | $ (22) | $ (1) |
| Operating lease, right-of-use asset, statement of financial position [Extensible List]                                            | Other assets                                 | Other assets |   |
| Operating lease, liability, statement of financial position [Extensible List]                                                     | Other liabilities                            | Other liabilities |   |
| Weighted average number diluted shares outstanding adjustment (in shares)                                                         | 1,000                                        | 1,000 | 1,000 |
| Interest paid, net                                                                                                                | $ 124                                        | $ 109 | $ 110 |
| Income taxes paid                                                                                                                 | 282                                          | 277 | $ 278 |
| Workers' Compensation Insurance                                                                                                   |                                         |   |   |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                  |                                         |   |   |
| Short-duration contracts, discounted liabilities, amount                                                                          | $ 88                                         | $ 93 |   |
| Furniture and Fixtures                                                                                                            |                                         |   |   |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                  |                                         |   |   |
| Property, plant and equipment, useful life                                                                                        | 7 years                                      |   |   |
| Office Equipment                                                                                                                  |                                         |   |   |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                  |                                         |   |   |
| Property, plant and equipment, useful life                                                                                        | 5 years                                      |   |   |
| Computer Software, Intangible Asset                                                                                               |                                         |   |   |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                  |                                         |   |   |
| Property, plant and equipment, useful life                                                                                        | 10 years                                     |   |   |
| Minimum                                                                                                                           |                                         |   |   |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                  |                                         |   |   |
| Warranty coverage term                                                                                                            | 1 month                                      |   |   |
| Requisite service period for stock- based compensation expense                                                                    | 3 years                                      |   |   |
| Minimum | Computer Software, Intangible Asset                                                                                     |                                         |   |   |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                  |                                         |   |   |
| Property, plant and equipment, useful life                                                                                        | 3 years                                      |   |   |
| Maximum                                                                                                                           |                                         |   |   |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                  |                                         |   |   |
| Warranty coverage term                                                                                                            | 10 years                                     |   |   |
| Maximum | Computer Software, Intangible Asset                                                                                     |                                         |   |   |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                  |                                         |   |   |
| Property, plant and equipment, useful life                                                                                        | 5 years                                      |   |   |
| CNAF Consolidated | Loews                                                                                                         |                                         |   |   |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                  |                                         |   |   |
| Noncontrolling interest, ownership percentage by parent                                                                           | 92.00%                                       |   |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of interest accretion recognized on the discounted reserves of workers’ compensation lifetime claim reserves
+ References
No definition available.
+ Details**Name:**cna_Amountofinterestaccretionrecognizedonthediscountedreservesofworkerscompensationlifetimeclaimreserves**Namespace Prefix:**cna_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of interest recognized on the discounted reserves of unfunded structured settlements
+ References
No definition available.
+ Details**Name:**cna_Amountofinterestrecognizedonthediscountedreservesofunfundedstructuredsettlements**Namespace Prefix:**cna_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Losses under deductible policies
+ References
No definition available.
+ Details**Name:**cna_AnticipatedAmountsDueFromInsuredsRelatedToLossesUnderDeductiblePolicies**Namespace Prefix:**cna_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Discounted reserves for unfunded structure settlements, discount amount
+ References
No definition available.
+ Details**Name:**cna_DiscountedReservesForUnfundedStructureSettlementsDiscountAmount**Namespace Prefix:**cna_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Discounted reserves for unfunded structured settlements
+ References
No definition available.
+ Details**Name:**cna_DiscountedReservesForUnfundedStructuredSettlements**Namespace Prefix:**cna_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Future Policy Benefit Reserves, Cash Flows Projected To Occur Beyond Tenor With Market-Observable Rates Available, Grading Period
+ References
No definition available.
+ Details**Name:**cna_FuturePolicyBenefitReservesCashFlowsProjectedToOccurBeyondTenorWithMarketObservableRatesAvailableGradingPeriod**Namespace Prefix:**cna_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage Of Billed Receivables Compared To Total Reinsurance Receivable
+ References
No definition available.
+ Details**Name:**cna_PercentageOfBilledReceivablesComparedToTotalReinsuranceReceivable**Namespace Prefix:**cna_**Data Type:**dtr-types1:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Structured Settlement Annuities, Interest Rates, Low End
+ References
No definition available.
+ Details**Name:**cna_StructuredSettlementAnnuitiesInterestRatesLowEnd**Namespace Prefix:**cna_**Data Type:**dtr-types1:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Warranty Coverage Term
+ References
No definition available.
+ Details**Name:**cna_WarrantyCoverageTerm**Namespace Prefix:**cna_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      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| - Definition
Indicates amendment to accounting standards.
+ References
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Amount, before tax, of realized and unrealized gain (loss) from foreign currency transaction.
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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.
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The liability as of the balance sheet date representing required funding mandated by statute or regulatory authority that is related directly or indirectly to underwriting activities, including pools for self-insurance and excluding premium taxes and income taxes. The funds derived from the assessments generally enable a government guarantor to pay insurance claims in the event that the underwriting insurer is insolvent or otherwise unable to meet its payment obligations.
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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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Indicates line item in statement of financial position that includes operating lease right-of-use asset.
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The percentage of earnings allocable to participating policyholders based on earnings of such policies for payment of dividends.
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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.
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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
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The carrying amount as of the balance sheet date of loss reserves carried at present value.
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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.
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Percent discount applied to worker's compensation reserve liability to reduce the reserve to present value.
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Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature.
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