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Income Taxes (Significant components of the Company's deferred tax assets and liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Tax Assets:    
Property and casualty claim and claim adjustment expense reserves $ 265us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves $ 289us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves
Unearned premium reserves 187us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve 178us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve
Receivables 35us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 50us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Employee benefits 289us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits 187us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
Life settlement contracts 46cna_DeferredTaxAssetsLifeSettlementContracts 46cna_DeferredTaxAssetsLifeSettlementContracts
Deferred retroactive reinsurance benefit 61cna_DeferredTaxAssetsDeferredRetroactiveReinsuranceBenefit 66cna_DeferredTaxAssetsDeferredRetroactiveReinsuranceBenefit
Other assets 138us-gaap_DeferredTaxAssetsOther 149us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets 1,021us-gaap_DeferredTaxAssetsGross 965us-gaap_DeferredTaxAssetsGross
Deferred Tax Liabilities:    
Investment valuation differences 50us-gaap_DeferredTaxLiabilitiesInvestments 68us-gaap_DeferredTaxLiabilitiesInvestments
Deferred acquisition costs 226us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost 232us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost
Net unrealized gains 489us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome 383us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome
Other liabilities 65us-gaap_DeferredTaxLiabilitiesOther 62us-gaap_DeferredTaxLiabilitiesOther
Deferred Tax Liabilities, Gross 830us-gaap_DeferredIncomeTaxLiabilities 745us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset (liability) $ 191us-gaap_DeferredTaxAssetsLiabilitiesNet $ 220us-gaap_DeferredTaxAssetsLiabilitiesNet