| **Schedule II. Condensed Financial Information of Registrant (Parent Company) (Schedule of Condensed Financial Information of Registrant, Balance Sheets) (Details) (USD $)In Millions, except Share data, unless otherwise specified** | Dec. 31, 2014                                                                                                            | Dec. 31, 2013                                                                                                             | Dec. 31, 2012                                              | Dec. 31, 2011    |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------|------------------|
| **Assets**                                                                                                                                                                                                                              |                                                                                                                     |                                                                                                                      |                                                       |             |
| Cash                                                                                                                                                                                                                                    | $ 190us-gaap_Cash                                                                                                        | $ 195us-gaap_Cash                                                                                                         | $ 156us-gaap_Cash                                          | $ 75us-gaap_Cash |
| Fixed maturity securities available-for-sale, at fair value (amortized cost of $1 and $1)                                                                                                                                               | 40,749us-gaap_AvailableForSaleSecuritiesDebtSecurities                                                                   | 41,197us-gaap_AvailableForSaleSecuritiesDebtSecurities                                                                    |                                                       |             |
| Short term investments                                                                                                                                                                                                                  | 1,706us-gaap_ShortTermInvestments                                                                                        | 1,407us-gaap_ShortTermInvestments                                                                                         |                                                       |             |
| Other assets                                                                                                                                                                                                                            | 841us-gaap_OtherAssets                                                                                                   | 969us-gaap_OtherAssets                                                                                                    |                                                       |             |
| Total assets                                                                                                                                                                                                                            | 55,566us-gaap_Assets                                                                                                     | 57,194us-gaap_Assets                                                                                                      |                                                       |             |
| **Liabilities**                                                                                                                                                                                                                         |                                                                                                                     |                                                                                                                      |                                                       |             |
| Short term debt                                                                                                                                                                                                                         |                                                                                                                     | 549us-gaap_LongTermDebtCurrent                                                                                            |                                                       |             |
| Long term debt                                                                                                                                                                                                                          | 2,559us-gaap_LongTermDebtNoncurrent                                                                                      | 2,011us-gaap_LongTermDebtNoncurrent                                                                                       |                                                       |             |
| Other liabilities                                                                                                                                                                                                                       | 3,833us-gaap_OtherLiabilities                                                                                            | 3,408us-gaap_OtherLiabilities                                                                                             |                                                       |             |
| Total liabilities                                                                                                                                                                                                                       | 42,772us-gaap_Liabilities                                                                                                | 44,543us-gaap_Liabilities                                                                                                 |                                                       |             |
| **Stockholders' Equity**                                                                                                                                                                                                                |                                                                                                                     |                                                                                                                      |                                                       |             |
| Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 269,980,202 and 269,717,583 shares outstanding)                                                                                                | 683us-gaap_CommonStockValue                                                                                              | 683us-gaap_CommonStockValue                                                                                               |                                                       |             |
| Additional paid-in capital                                                                                                                                                                                                              | 2,151us-gaap_AdditionalPaidInCapitalCommonStock                                                                          | 2,145us-gaap_AdditionalPaidInCapitalCommonStock                                                                           |                                                       |             |
| Retained earnings                                                                                                                                                                                                                       | 9,645us-gaap_RetainedEarningsAccumulatedDeficit                                                                          | 9,495us-gaap_RetainedEarningsAccumulatedDeficit                                                                           |                                                       |             |
| Accumulated other comprehensive income (loss)                                                                                                                                                                                           | 400us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax                                                               | 442us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax                                                                | 831us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |             |
| Treasury stock (3,060,041 and 3,322,660 shares), at cost                                                                                                                                                                                | (84)us-gaap_TreasuryStockValue                                                                                           | (91)us-gaap_TreasuryStockValue                                                                                            |                                                       |             |
| Notes receivable for the issuance of common stock                                                                                                                                                                                       | (1)us-gaap_ReceivableFromOfficersAndDirectorsForIssuanceOfCapitalStock                                                   | (23)us-gaap_ReceivableFromOfficersAndDirectorsForIssuanceOfCapitalStock                                                   |                                                       |             |
| Total stockholders’ equity                                                                                                                                                                                                       | 12,794us-gaap_StockholdersEquity                                                                                         | 12,651us-gaap_StockholdersEquity                                                                                          | 12,314us-gaap_StockholdersEquity                           |             |
| Total liabilities and stockholders' equity                                                                                                                                                                                              | 55,566us-gaap_LiabilitiesAndStockholdersEquity                                                                           | 57,194us-gaap_LiabilitiesAndStockholdersEquity                                                                            |                                                       |             |
| **Balance Sheet Parenthetical**                                                                                                                                                                                                         |                                                                                                                     |                                                                                                                      |                                                       |             |
| Marketable securities fixed maturities available-for-sale at amortized cost basis                                                                                                                                                       | 37,316us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis                                                           | 39,275us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis                                                            |                                                       |             |
| Common stock, par value                                                                                                                                                                                                                 | $ 0us-gaap_CommonStockParOrStatedValuePerShare                                                                           | $ 2.50us-gaap_CommonStockParOrStatedValuePerShare                                                                         |                                                       |             |
| Common stock, shares authorized                                                                                                                                                                                                         | 500,000,000us-gaap_CommonStockSharesAuthorized                                                                           | 500,000,000us-gaap_CommonStockSharesAuthorized                                                                            |                                                       |             |
| Common stock, shares issued                                                                                                                                                                                                             | 273,040,243us-gaap_CommonStockSharesIssued                                                                               | 273,040,243us-gaap_CommonStockSharesIssued                                                                                |                                                       |             |
| Common stock, shares outstanding                                                                                                                                                                                                        | 269,980,202us-gaap_CommonStockSharesOutstanding                                                                          | 269,717,583us-gaap_CommonStockSharesOutstanding                                                                           |                                                       |             |
| Treasury stock, shares                                                                                                                                                                                                                  | 3,060,041us-gaap_TreasuryStockShares                                                                                     | 3,322,660us-gaap_TreasuryStockShares                                                                                      |                                                       |             |
| Parent Company [Member]                                                                                                                                                                                                                 |                                                                                                                     |                                                                                                                      |                                                       |             |
| **Assets**                                                                                                                                                                                                                              |                                                                                                                     |                                                                                                                      |                                                       |             |
| Investment in subsidiaries                                                                                                                                                                                                              | 14,867cna_InvestmentInSubsidiaries/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                     | 14,708cna_InvestmentInSubsidiaries/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                      |                                                       |             |
| Cash                                                                                                                                                                                                                                    | 1us-gaap_Cash/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                                          | 1us-gaap_Cash/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                                           |                                                       |             |
| Fixed maturity securities available-for-sale, at fair value (amortized cost of $1 and $1)                                                                                                                                               | 1us-gaap_AvailableForSaleSecuritiesDebtSecurities/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                      | 1us-gaap_AvailableForSaleSecuritiesDebtSecurities/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                       |                                                       |             |
| Short term investments                                                                                                                                                                                                                  | 499us-gaap_ShortTermInvestments/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                        | 505us-gaap_ShortTermInvestments/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                         |                                                       |             |
| Amounts due from subsidiaries                                                                                                                                                                                                           |                                                                                                                     | 3us-gaap_DueFromAffiliates/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                              |                                                       |             |
| Other assets                                                                                                                                                                                                                            | 3us-gaap_OtherAssets/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                                   | 3us-gaap_OtherAssets/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                                    |                                                       |             |
| Total assets                                                                                                                                                                                                                            | 15,371us-gaap_Assets/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                                   | 15,221us-gaap_Assets/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                                    |                                                       |             |
| **Liabilities**                                                                                                                                                                                                                         |                                                                                                                     |                                                                                                                      |                                                       |             |
| Short term debt                                                                                                                                                                                                                         |                                                                                                                     | 549us-gaap_LongTermDebtCurrent/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                          |                                                       |             |
| Long term debt                                                                                                                                                                                                                          | 2,529us-gaap_LongTermDebtNoncurrent/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                    | 1,981us-gaap_LongTermDebtNoncurrent/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                     |                                                       |             |
| Other liabilities                                                                                                                                                                                                                       | 48us-gaap_OtherLiabilities/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                             | 40us-gaap_OtherLiabilities/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                              |                                                       |             |
| Total liabilities                                                                                                                                                                                                                       | 2,577us-gaap_Liabilities/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                               | 2,570us-gaap_Liabilities/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                                |                                                       |             |
| **Stockholders' Equity**                                                                                                                                                                                                                |                                                                                                                     |                                                                                                                      |                                                       |             |
| Common stock ($2.50 par value; 500,000,000 shares authorized; 273,040,243 shares issued; 269,980,202 and 269,717,583 shares outstanding)                                                                                                | 683us-gaap_CommonStockValue/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                            | 683us-gaap_CommonStockValue/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                             |                                                       |             |
| Additional paid-in capital                                                                                                                                                                                                              | 2,151us-gaap_AdditionalPaidInCapitalCommonStock/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                        | 2,145us-gaap_AdditionalPaidInCapitalCommonStock/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                         |                                                       |             |
| Retained earnings                                                                                                                                                                                                                       | 9,645us-gaap_RetainedEarningsAccumulatedDeficit/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                        | 9,495us-gaap_RetainedEarningsAccumulatedDeficit/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                         |                                                       |             |
| Accumulated other comprehensive income (loss)                                                                                                                                                                                           | 400us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember             | 442us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember              |                                                       |             |
| Treasury stock (3,060,041 and 3,322,660 shares), at cost                                                                                                                                                                                | (84)us-gaap_TreasuryStockValue/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                         | (91)us-gaap_TreasuryStockValue/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                          |                                                       |             |
| Notes receivable for the issuance of common stock                                                                                                                                                                                       | (1)us-gaap_ReceivableFromOfficersAndDirectorsForIssuanceOfCapitalStock/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | (23)us-gaap_ReceivableFromOfficersAndDirectorsForIssuanceOfCapitalStock/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |                                                       |             |
| Total stockholders’ equity                                                                                                                                                                                                       | 12,794us-gaap_StockholdersEquity/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                       | 12,651us-gaap_StockholdersEquity/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                        |                                                       |             |
| Total liabilities and stockholders' equity                                                                                                                                                                                              | 15,371us-gaap_LiabilitiesAndStockholdersEquity/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                         | 15,221us-gaap_LiabilitiesAndStockholdersEquity/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                          |                                                       |             |
| **Balance Sheet Parenthetical**                                                                                                                                                                                                         |                                                                                                                     |                                                                                                                      |                                                       |             |
| Marketable securities fixed maturities available-for-sale at amortized cost basis                                                                                                                                                       | $ 1us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember            | $ 1us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember             |                                                       |             |
| Common stock, par value                                                                                                                                                                                                                 | $ 2.50us-gaap_CommonStockParOrStatedValuePerShare/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                      | $ 2.50us-gaap_CommonStockParOrStatedValuePerShare/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                       |                                                       |             |
| Common stock, shares authorized                                                                                                                                                                                                         | 500,000,000us-gaap_CommonStockSharesAuthorized/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                         | 500,000,000us-gaap_CommonStockSharesAuthorized/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                          |                                                       |             |
| Common stock, shares issued                                                                                                                                                                                                             | 273,040,243us-gaap_CommonStockSharesIssued/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                             | 273,040,243us-gaap_CommonStockSharesIssued/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                              |                                                       |             |
| Common stock, shares outstanding                                                                                                                                                                                                        | 269,980,202us-gaap_CommonStockSharesOutstanding/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                        | 269,717,583us-gaap_CommonStockSharesOutstanding/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                         |                                                       |             |
| Treasury stock, shares                                                                                                                                                                                                                  | 3,060,041us-gaap_TreasuryStockShares/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                   | 3,322,660us-gaap_TreasuryStockShares/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember                                    |                                                       |             |

| X                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The entity's equity interest in its subsidiaries.
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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.
+ References
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| - Definition
This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.
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| - Definition
Amount of debt securities categorized neither as held-to-maturity nor trading.
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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
Face amount or stated value per share of common stock.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The maximum number of common shares permitted to be issued by an entity's charter and bylaws.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.
+ References
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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
For an unclassified balance sheet, amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership.
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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
Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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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
The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.
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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
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
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.
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| - Definition
Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.
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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.
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