| **Consolidated Statements of Operations (USD $)In Millions, except Per Share data, unless otherwise specified**                                                                                       | 12 Months Ended                                                                                          |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------|
||
| **Revenues**                                                                                                                                                                                          |                                                                                                     |  |   |  |   |
| Net earned premiums                                                                                                                                                                                   | $ 7,212us-gaap_PremiumsEarnedNet                                                                         |  | $ 7,271us-gaap_PremiumsEarnedNet |  | $ 6,881us-gaap_PremiumsEarnedNet |
| Net investment income                                                                                                                                                                                 | 2,067cna_NetInvestmentIncomeAndGainsLossesOnTradingSecurities                                            |  | 2,282cna_NetInvestmentIncomeAndGainsLossesOnTradingSecurities |  | 2,110cna_NetInvestmentIncomeAndGainsLossesOnTradingSecurities |
| **Net realized investment gains (losses):**                                                                                                                                                           |                                                                                                     |  |   |  |   |
| Other-than-temporary impairment losses                                                                                                                                                                | (77)us-gaap_ImpairmentOfInvestments                                                                      |  | (74)us-gaap_ImpairmentOfInvestments |  | (127)us-gaap_ImpairmentOfInvestments |
| Portion of other-than-temporary impairments recognized in Other comprehensive income                                                                                                                  |                                                                                                     |  | (2)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent |  | (23)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent |
| Net other-than-temporary impairment losses recognized in earnings                                                                                                                                     | (77)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet                  |  | (76)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet |  | (150)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet |
| Other net realized investment gains (loss)                                                                                                                                                            | 134us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments         |  | 96us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments |  | 204us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments |
| Net realized investment gains (losses)                                                                                                                                                                | 57us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet                                             |  | 20us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet |  | 54us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet |
| Other revenues                                                                                                                                                                                        | 356us-gaap_OtherIncome                                                                                   |  | 359us-gaap_OtherIncome |  | 319us-gaap_OtherIncome |
| Total revenues                                                                                                                                                                                        | 9,692us-gaap_Revenues                                                                                    |  | 9,932us-gaap_Revenues |  | 9,364us-gaap_Revenues |
| **Claims, Benefits and Expenses**                                                                                                                                                                     |                                                                                                     |  |   |  |   |
| Insurance claims and policyholders' benefits                                                                                                                                                          | 5,591cna_Insuranceclaimsandpolicyholdersbenefitsincludingpolicyholdersdividends                          |  | 5,806cna_Insuranceclaimsandpolicyholdersbenefitsincludingpolicyholdersdividends |  | 5,729cna_Insuranceclaimsandpolicyholdersbenefitsincludingpolicyholdersdividends |
| Amortization of deferred acquisition costs                                                                                                                                                            | 1,317us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense                                            |  | 1,362us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense |  | 1,274us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense |
| Other operating expenses                                                                                                                                                                              | 1,394us-gaap_OtherCostAndExpenseOperating                                                                |  | 1,322us-gaap_OtherCostAndExpenseOperating |  | 1,332us-gaap_OtherCostAndExpenseOperating |
| Interest                                                                                                                                                                                              | 183us-gaap_InterestExpense                                                                               |  | 166us-gaap_InterestExpense |  | 170us-gaap_InterestExpense |
| Total claims, benefits and expenses                                                                                                                                                                   | 8,485us-gaap_BenefitsLossesAndExpenses                                                                   |  | 8,656us-gaap_BenefitsLossesAndExpenses |  | 8,505us-gaap_BenefitsLossesAndExpenses |
| Income (loss) from continuing operations before income tax                                                                                                                                            | 1,207us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  | 1,276us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  | 859us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |
| Income tax expense (benefit)                                                                                                                                                                          | (319)us-gaap_IncomeTaxExpenseBenefit                                                                     |  | (361)us-gaap_IncomeTaxExpenseBenefit |  | (239)us-gaap_IncomeTaxExpenseBenefit |
| Net income (loss) from continuing operations                                                                                                                                                          | 888us-gaap_IncomeLossFromContinuingOperations                                                            |  | 915us-gaap_IncomeLossFromContinuingOperations |  | 620us-gaap_IncomeLossFromContinuingOperations |
| (Loss) income from discontinued operations, net of income tax benefit (expense)                                                                                                                       | (197)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity                   |  | 22us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity |  | 8us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity |
| Net income (loss)                                                                                                                                                                                     | $ 691us-gaap_NetIncomeLoss                                                                               | [1] | $ 937us-gaap_NetIncomeLoss |  | $ 628us-gaap_NetIncomeLoss |
| **Basic Earnings (Loss) Per Share Attributable to CNA**                                                                                                                                               |                                                                                                     |  |   |  |   |
| Income (loss) from continuing operations                                                                                                                                                              | $ 3.29us-gaap_IncomeLossFromContinuingOperationsPerBasicShare                                            |  | $ 3.39us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |  | $ 2.30us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |
| (Loss) income from discontinued operations                                                                                                                                                            | $ (0.73)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare                                |  | $ 0.09us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |  | $ 0.03us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |
| Basic earnings (loss) per share                                                                                                                                                                       | $ 2.56us-gaap_EarningsPerShareBasic                                                                      |  | $ 3.48us-gaap_EarningsPerShareBasic |  | $ 2.33us-gaap_EarningsPerShareBasic |
| **Diluted Earnings (Loss) Per Share Attributable to CNA**                                                                                                                                             |                                                                                                     |  |   |  |   |
| Income (loss) from continuing operations                                                                                                                                                              | $ 3.28us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare                                          |  | $ 3.39us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |  | $ 2.30us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |
| (Loss) income from discontinued operations                                                                                                                                                            | $ (0.73)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare                              |  | $ 0.08us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |  | $ 0.03us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |
| Diluted earnings (loss) per share                                                                                                                                                                     | $ 2.55us-gaap_EarningsPerShareDiluted                                                                    |  | $ 3.47us-gaap_EarningsPerShareDiluted | [2] | $ 2.33us-gaap_EarningsPerShareDiluted |
| Dividends per share                                                                                                                                                                                   | $ 2.00us-gaap_CommonStockDividendsPerShareCashPaid                                                       |  | $ 0.80us-gaap_CommonStockDividendsPerShareCashPaid |  | $ 0.60us-gaap_CommonStockDividendsPerShareCashPaid |
| **Weighted Average Outstanding Common Stock and Common Stock Equivalents**                                                                                                                            |                                                                                                     |  |   |  |   |
| Basic                                                                                                                                                                                                 | 269.9us-gaap_WeightedAverageNumberOfSharesOutstandingBasic                                               |  | 269.7us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 269.4us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
| Diluted                                                                                                                                                                                               | 270.6us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding                                             |  | 270.2us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 269.8us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
|                                                                                                                                                                                                       |
| [1]Net income in the first quarter of 2014 includes the impairment loss on the sale of CAC.[2]Due to the averaging of shares, quarterly earnings per share do not add to the total for the full year. |

| X                                                                                                                                                                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Insurance claims and policyholders' benefits, including policyholders' dividends
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| - Definition
The income earned from investments in securities and property, equipment and other capital assets. It includes rent from property and equipment, dividends from shares in corporations, and interest from bonds, loans, mortgages, derivatives, commercial paper, bank accounts, certificates of deposits, treasuries, and other financial securities. It also includes realized gains and losses on trading securities.
+ References
No definition available.
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| - Definition
This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The total amount of expense recognized during the period for future policy benefits, claims and claims adjustment costs, and for selling, general and administrative costs.
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| - Definition
Aggregate dividends paid during the period for each share of common stock outstanding.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expense related to deferred policy acquisition costs.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.
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| - Definition
The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.
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| - Definition
Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.
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| - Definition
Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.
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| - Definition
Per diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.
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| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the cost of borrowed funds accounted for as interest expense.
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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| - Definition
The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.
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| - Definition
Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement.
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| - Definition
Amount before tax of other than temporary impairment loss (OTTI) on investments in available-for-sale and held-to-maturity debt securities, recognized in other comprehensive loss and attributable to parent entity.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.
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| - Definition
Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).
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| - Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.
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| - Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.
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