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Discontinued Operations Income Statement Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenues    
Net Investment Income   $ 41cna_DisposalGroupIncludingDiscontinuedOperationNetInvestmentIncome
Net Realized Investment Gains (Losses)   1cna_DisposalGroupIncludingDiscontinuedOperationNetRealizedInvestmentGains
Total Revenues   42us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Claims, Benefits and Expenses    
Insurance Claims and Policyholders' Benefits   31cna_DisposalGroupIncludingDiscontinuedOperationInsuranceClaimsandPolicyholdersBenefits
Other Operating Expenses   1cna_DisposalGroupIncludingDiscontinuedOperationOtherOperatingExpenses
Total Claims, Benefits and Expenses   32us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense
Income before Income Tax   10us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax
Income tax (expense) benefit   (3)us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod
Income from operations of discontinued operations, net of income tax   7us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
Impairment loss on sale, net of income tax benefit   (214)us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax
Income (Loss) from Discontinued Operations 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (207)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Income tax benefit (expense) on impairment   $ 41us-gaap_DiscontinuedOperationTaxExpenseBenefitFromProvisionForGainLossOnDisposal