| **Consolidated Balance Sheets (USD $)In Millions, unless otherwise specified** | Mar. 31, 2015                                                          | Dec. 31, 2014                                                          |
|--------------------------------------------------------------------------------|------------------------------------------------------------------------|------------------------------------------------------------------------|
| **Assets**                                                                     |                                                                   |                                                                   |
| Fixed maturity securities at fair value                                        | $ 40,605us-gaap_MarketableSecuritiesFixedMaturities                    | $ 40,768us-gaap_MarketableSecuritiesFixedMaturities                    |
| Equity securities at fair value                                                | 225us-gaap_MarketableSecuritiesEquitySecurities                        | 222us-gaap_MarketableSecuritiesEquitySecurities                        |
| Limited partnership investments                                                | 2,967cna_LimitedPartnershipInvestments                                 | 2,937cna_LimitedPartnershipInvestments                                 |
| Other invested assets                                                          | 43us-gaap_OtherInvestments                                             | 41us-gaap_OtherInvestments                                             |
| Mortgage loans                                                                 | 586us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet           | 588us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet           |
| Short term investments                                                         | 1,506us-gaap_ShortTermInvestments                                      | 1,706us-gaap_ShortTermInvestments                                      |
| Total investments                                                              | 45,932us-gaap_Investments                                              | 46,262us-gaap_Investments                                              |
| Cash                                                                           | 201us-gaap_Cash                                                        | 190us-gaap_Cash                                                        |
| Reinsurance receivables                                                        | 4,720us-gaap_ReinsuranceRecoverables                                   | 4,694us-gaap_ReinsuranceRecoverables                                   |
| Insurance receivables                                                          | 2,050us-gaap_PremiumsReceivableAtCarryingValue                         | 1,936us-gaap_PremiumsReceivableAtCarryingValue                         |
| Accrued investment income                                                      | 430us-gaap_AccruedInvestmentIncomeReceivable                           | 405us-gaap_AccruedInvestmentIncomeReceivable                           |
| Deferred acquisition costs                                                     | 616us-gaap_DeferredPolicyAcquisitionCosts                              | 600us-gaap_DeferredPolicyAcquisitionCosts                              |
| Deferred income taxes                                                          | 57us-gaap_DeferredTaxAssetsLiabilitiesNet                              | 191us-gaap_DeferredTaxAssetsLiabilitiesNet                             |
| Property and equipment at cost                                                 | 298us-gaap_PropertyPlantAndEquipmentNet                                | 295us-gaap_PropertyPlantAndEquipmentNet                                |
| Goodwill                                                                       | 151us-gaap_Goodwill                                                    | 152us-gaap_Goodwill                                                    |
| Other assets                                                                   | 1,010us-gaap_OtherAssets                                               | 841us-gaap_OtherAssets                                                 |
| Total assets                                                                   | 55,465us-gaap_Assets                                                   | 55,566us-gaap_Assets                                                   |
| **Liabilities**                                                                |                                                                   |                                                                   |
| Claim and claim adjustment expenses                                            | 23,248us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense             | 23,271us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense             |
| Unearned premiums                                                              | 3,710us-gaap_UnearnedPremiums                                          | 3,592us-gaap_UnearnedPremiums                                          |
| Future policy benefits                                                         | 9,747us-gaap_LiabilityForFuturePolicyBenefits                          | 9,490us-gaap_LiabilityForFuturePolicyBenefits                          |
| Policyholders’ funds                                                    | 0us-gaap_PolicyholderContractDeposits                                  | 27us-gaap_PolicyholderContractDeposits                                 |
| Long term debt                                                                 | 2,560us-gaap_LongTermDebtNoncurrent                                    | 2,559us-gaap_LongTermDebtNoncurrent                                    |
| Other liabilities                                                              | 3,763us-gaap_OtherLiabilities                                          | 3,833us-gaap_OtherLiabilities                                          |
| Total liabilities                                                              | 43,028us-gaap_Liabilities                                              | 42,772us-gaap_Liabilities                                              |
| **Stockholders' Equity**                                                       |                                                                   |                                                                   |
| Common stock                                                                   | 683us-gaap_CommonStockValue                                            | 683us-gaap_CommonStockValue                                            |
| Additional paid-in capital                                                     | 2,143us-gaap_AdditionalPaidInCapitalCommonStock                        | 2,151us-gaap_AdditionalPaidInCapitalCommonStock                        |
| Retained earnings                                                              | 9,270us-gaap_RetainedEarningsAccumulatedDeficit                        | 9,645us-gaap_RetainedEarningsAccumulatedDeficit                        |
| Accumulated other comprehensive income (loss)                                  | 421us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax             | 400us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax             |
| Treasury stock                                                                 | (79)us-gaap_TreasuryStockValue                                         | (84)us-gaap_TreasuryStockValue                                         |
| Notes receivable for the issuance of common stock                              | (1)us-gaap_ReceivableFromOfficersAndDirectorsForIssuanceOfCapitalStock | (1)us-gaap_ReceivableFromOfficersAndDirectorsForIssuanceOfCapitalStock |
| Total stockholders’ equity                                              | 12,437us-gaap_StockholdersEquity                                       | 12,794us-gaap_StockholdersEquity                                       |
| Total liabilities and stockholders' equity                                     | $ 55,465us-gaap_LiabilitiesAndStockholdersEquity                       | $ 55,566us-gaap_LiabilitiesAndStockholdersEquity                       |

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Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.
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| - Definition
Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.
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| - Definition
Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.
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| - Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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| - Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.
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| - Definition
Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.
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| - Definition
Net amount of deferred policy acquisition costs capitalized on contracts remaining in force as of the balance sheet date.
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| - Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.
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| - Definition
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
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| - Definition
Sum of the carrying amounts as of the balance sheet date of all investments.
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| - Definition
Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.
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| - Definition
Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.
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| - Definition
The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.
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Amount of accrued obligation to policyholders that relates to insured events for long-duration contracts.
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| - Definition
Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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| - Definition
For an unclassified balance sheet, this item represents investments in common and preferred stocks and other forms of securities that provide ownership interests in a corporation.
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| - Definition
For an unclassified balance sheet, this item represents investments in debt securities having predetermined or determinable maturity dates.
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| - Definition
The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.
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| - Definition
The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.
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| - Definition
Other investments not otherwise specified in the taxonomy.
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| - Definition
The aggregate carrying amount, as of the balance sheet date, of liabilities not separately disclosed in the balance sheet.
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| - Definition
The liability as of the balance sheet date to the policyholders for deposits held under the terms of insurance contracts.
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| - Definition
The carrying amount as of the balance sheet date due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, net of the allowance for doubtful accounts.
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| - Definition
Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.
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| - Definition
Amounts receivable from officers and directors resulting from the sale of stock to officers or directors before the cash payment is received.
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| - Definition
Amount after valuation allowance recoverable including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.
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| - Definition
The cumulative amount of the reporting entity's undistributed earnings or deficit.
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| - Definition
Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
+ References
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| - Definition
The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.
+ References
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| - Definition
Carrying amount of premiums written on insurance contracts that have not been earned as of the balance sheet date.
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