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Discontinued Operations Income Statement Information (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenues      
Net Earned Premium     $ 1cna_DisposalGroupIncludingDiscontinuedOperationsNetEarnedPremium
Net Investment Income 94cna_DisposalGroupIncludingDiscontinuedOperationNetInvestmentIncome 168cna_DisposalGroupIncludingDiscontinuedOperationNetInvestmentIncome 172cna_DisposalGroupIncludingDiscontinuedOperationNetInvestmentIncome
Net Realized Investment Gains (Losses) 3cna_DisposalGroupIncludingDiscontinuedOperationNetRealizedInvestmentGains 11cna_DisposalGroupIncludingDiscontinuedOperationNetRealizedInvestmentGains 9cna_DisposalGroupIncludingDiscontinuedOperationNetRealizedInvestmentGains
Other Revenues   2cna_DisposalGroupIncludingDiscontinuedOperationOtherRevenues 1cna_DisposalGroupIncludingDiscontinuedOperationOtherRevenues
Total Revenues 97us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue 181us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue 183us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Claims, Benefits and Expenses      
Insurance Claims and Policyholders' Benefits 75cna_DisposalGroupIncludingDiscontinuedOperationInsuranceClaimsandPolicyholdersBenefits 141cna_DisposalGroupIncludingDiscontinuedOperationInsuranceClaimsandPolicyholdersBenefits 167cna_DisposalGroupIncludingDiscontinuedOperationInsuranceClaimsandPolicyholdersBenefits
Other Operating Expenses 2cna_DisposalGroupIncludingDiscontinuedOperationOtherOperatingExpenses 3cna_DisposalGroupIncludingDiscontinuedOperationOtherOperatingExpenses 3cna_DisposalGroupIncludingDiscontinuedOperationOtherOperatingExpenses
Total Claims, Benefits and Expenses 77us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense 144us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense 170us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense
Income before Income Tax 20us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax 37us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax 13us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax
Income tax (expense) benefit (6)us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod (15)us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod (5)us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod
Income from operations of discontinued operations, net of income tax 14us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax 22us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax 8us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
Loss on sale, net of income tax (expense) benefit of $40, - and - (211)us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax    
Income (Loss) from Discontinued Operations (197)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 22us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 8us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Income tax benefit (expense) on impairment $ 40us-gaap_DiscontinuedOperationTaxExpenseBenefitFromProvisionForGainLossOnDisposal