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Schedule II. Condensed Financial Information of Registrant (Parent Company) (Schedule of Condensed Financial Information of Registrant, Statements of Cash Flows) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash Flows from Operating Activities      
Net income (loss) $ 691us-gaap_NetIncomeLoss [1] $ 937us-gaap_NetIncomeLoss $ 628us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash flows provided (used) by operating activities:      
Net realized investment (gains) losses (57)us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet (20)us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet (54)us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Other, net 54us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities 10us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities 18us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Total adjustments 749us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities 267us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities 622us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash flows provided (used) by operating activities 1,440us-gaap_NetCashProvidedByUsedInOperatingActivities 1,204us-gaap_NetCashProvidedByUsedInOperatingActivities 1,250us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flows from Investing Activities      
Change in short term investments (388)cna_ChangeInShortTermInvestments 425cna_ChangeInShortTermInvestments (7)cna_ChangeInShortTermInvestments
Other, net 16us-gaap_PaymentsForProceedsFromOtherInvestingActivities 11us-gaap_PaymentsForProceedsFromOtherInvestingActivities 16us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash flows provided (used) by investing activities (918)us-gaap_NetCashProvidedByUsedInInvestingActivities (898)us-gaap_NetCashProvidedByUsedInInvestingActivities (934)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash Flows from Financing Activities      
Dividends paid to common stockholders (541)us-gaap_PaymentsOfDividendsCommonStock (216)us-gaap_PaymentsOfDividendsCommonStock (162)us-gaap_PaymentsOfDividendsCommonStock
Proceeds from the issuance of debt 546us-gaap_ProceedsFromIssuanceOfLongTermDebt    
Repayment of debt (549)us-gaap_RepaymentsOfLongTermDebt (13)us-gaap_RepaymentsOfLongTermDebt (70)us-gaap_RepaymentsOfLongTermDebt
Other, net 25us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (35)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (7)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash flows provided (used) by financing activities (519)us-gaap_NetCashProvidedByUsedInFinancingActivities (264)us-gaap_NetCashProvidedByUsedInFinancingActivities (239)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net change in cash (5)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 39us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 81us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash, beginning of year 195us-gaap_Cash 156us-gaap_Cash 75us-gaap_Cash
Cash, end of year 190us-gaap_Cash 195us-gaap_Cash 156us-gaap_Cash
Parent Company [Member]      
Cash Flows from Operating Activities      
Net income (loss) 691us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
937us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
628us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Adjustments to reconcile net income (loss) to net cash flows provided (used) by operating activities:      
Equity in net income (loss) of subsidiaries (838)us-gaap_IncomeLossFromSubsidiariesNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,068)us-gaap_IncomeLossFromSubsidiariesNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(635)us-gaap_IncomeLossFromSubsidiariesNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Dividends received from subsidiaries 650us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
400us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
450us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net realized investment (gains) losses (4)us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(4)us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(4)us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other, net 14us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
8us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
19us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total adjustments (178)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(664)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(170)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash flows provided (used) by operating activities 513us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
273us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
458us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash Flows from Investing Activities      
Proceeds from fixed maturity securities   1us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Change in short term investments 6cna_ChangeInShortTermInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(57)cna_ChangeInShortTermInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(156)cna_ChangeInShortTermInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Capital contributions to subsidiaries (10)cna_CapitalContributionsToSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(12)cna_CapitalContributionsToSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(399)cna_CapitalContributionsToSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Repayment of surplus note by subsidiary     250cna_RepaymentOfSurplusNoteBySubsidiary
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other, net 5us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash flows provided (used) by investing activities 1us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(64)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(300)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash Flows from Financing Activities      
Dividends paid to common stockholders (541)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(216)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(162)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Proceeds from the issuance of debt 546us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Repayment of debt (549)us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(3)us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Stock options exercised 5us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1us-gaap_ProceedsFromStockOptionsExercised
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other, net 25us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
9us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash flows provided (used) by financing activities (514)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(208)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(158)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net change in cash   1us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Cash, beginning of year 1us-gaap_Cash
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Cash, end of year $ 1us-gaap_Cash
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 1us-gaap_Cash
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
[1] Net income in the first quarter of 2014 includes the impairment loss on the sale of CAC.