<XBRL>
<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<xsd:schema attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.cna.com/20191231" xmlns:cna="http://www.cna.com/20191231" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <xsd:import namespace="http://fasb.org/srt-types/2019-01-31" schemaLocation="http://xbrl.fasb.org/srt/2019/elts/srt-types-2019-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/srt/2019-01-31" schemaLocation="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/us-gaap/2019-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/us-roles/2019-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2019/elts/us-roles-2019-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/us-types/2019-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2019/elts/us-types-2019-01-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/arcrole/fact-explanatoryFact" schemaLocation="http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/net" schemaLocation="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />
  <xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/country/2017-01-31" schemaLocation="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/currency/2019-01-31" schemaLocation="https://xbrl.sec.gov/currency/2019/currency-2019-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/dei/2019-01-31" schemaLocation="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/exch/2019-01-31" schemaLocation="https://xbrl.sec.gov/exch/2019/exch-2019-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/invest/2013-01-31" schemaLocation="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/naics/2017-01-31" schemaLocation="http://xbrl.sec.gov/naics/2017/naics-2017-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/sic/2011-01-31" schemaLocation="http://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/stpr/2018-01-31" schemaLocation="https://xbrl.sec.gov/stpr/2018/stpr-2018-01-31.xsd" />
  <xsd:annotation>
    <xsd:appinfo>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="cna-20191231_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="cna-20191231_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="cna-20191231_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="cna-20191231_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple" />
      <link:roleType id="AccumulatedOtherComprehensiveIncomeLossByComponent" roleURI="http://www.cna.com/role/AccumulatedOtherComprehensiveIncomeLossByComponent">
        <link:definition>2142100 - Disclosure - Accumulated Other Comprehensive Income (Loss) by Component</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccumulatedOtherComprehensiveIncomeLossByComponentScheduleOfAccumulatedOtherComprehensiveIncomeLossByComponentDetails" roleURI="http://www.cna.com/role/AccumulatedOtherComprehensiveIncomeLossByComponentScheduleOfAccumulatedOtherComprehensiveIncomeLossByComponentDetails">
        <link:definition>2442402 - Disclosure - Accumulated Other Comprehensive Income (Loss) by Component Schedule of Accumulated Other Comprehensive Income (Loss) by Component (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccumulatedOtherComprehensiveIncomeLossByComponentTables" roleURI="http://www.cna.com/role/AccumulatedOtherComprehensiveIncomeLossByComponentTables">
        <link:definition>2342301 - Disclosure - Accumulated Other Comprehensive Income (Loss) by Component (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlans" roleURI="http://www.cna.com/role/BenefitPlans">
        <link:definition>2133100 - Disclosure - Benefit Plans</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansActuarialAssumptionsForBenefitObligationsDetails" roleURI="http://www.cna.com/role/BenefitPlansActuarialAssumptionsForBenefitObligationsDetails">
        <link:definition>2433406 - Disclosure - Benefit Plans (Actuarial Assumptions for Benefit Obligations) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansActuarialAssumptionsForNetCostOrBenefitDetails" roleURI="http://www.cna.com/role/BenefitPlansActuarialAssumptionsForNetCostOrBenefitDetails">
        <link:definition>2433407 - Disclosure - Benefit Plans (Actuarial Assumptions for Net Cost or Benefit) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansComponentsOfNetPeriodicCostBenefitDetails" roleURI="http://www.cna.com/role/BenefitPlansComponentsOfNetPeriodicCostBenefitDetails">
        <link:definition>2433404 - Disclosure - Benefit Plans (Components of net periodic cost (benefit)) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansEstimatedFutureMinimumBenefitPaymentsToParticipantsDetails" roleURI="http://www.cna.com/role/BenefitPlansEstimatedFutureMinimumBenefitPaymentsToParticipantsDetails">
        <link:definition>2433409 - Disclosure - Benefit Plans (Estimated Future Minimum Benefit Payments to Participants) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansFairValueOfPlanAssetsMeasuredOnRecurringBasisDetails" roleURI="http://www.cna.com/role/BenefitPlansFairValueOfPlanAssetsMeasuredOnRecurringBasisDetails">
        <link:definition>2433408 - Disclosure - Benefit Plans (Fair Value of Plan Assets Measured on a Recurring Basis) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansFundedStatusDetails" roleURI="http://www.cna.com/role/BenefitPlansFundedStatusDetails">
        <link:definition>2433403 - Disclosure - Benefit Plans (Funded Status) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansNarrativeDetails" roleURI="http://www.cna.com/role/BenefitPlansNarrativeDetails">
        <link:definition>2433402 - Disclosure - Benefit Plans (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansScheduleOfAmountsRecognizedInOtherComprehensiveIncomeDetails" roleURI="http://www.cna.com/role/BenefitPlansScheduleOfAmountsRecognizedInOtherComprehensiveIncomeDetails">
        <link:definition>2433405 - Disclosure - Benefit Plans (Schedule of amounts recognized in Other comprehensive income) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansTables" roleURI="http://www.cna.com/role/BenefitPlansTables">
        <link:definition>2333301 - Disclosure - Benefit Plans (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BusinessSegments" roleURI="http://www.cna.com/role/BusinessSegments">
        <link:definition>2143100 - Disclosure - Business Segments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BusinessSegmentsBalanceSheetInformationDetails" roleURI="http://www.cna.com/role/BusinessSegmentsBalanceSheetInformationDetails">
        <link:definition>2443404 - Disclosure - Business Segments (Balance Sheet Information) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BusinessSegmentsIncomeStatementInformationDetails" roleURI="http://www.cna.com/role/BusinessSegmentsIncomeStatementInformationDetails">
        <link:definition>2443403 - Disclosure - Business Segments (Income Statement Information) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BusinessSegmentsNarrativeDetails" roleURI="http://www.cna.com/role/BusinessSegmentsNarrativeDetails">
        <link:definition>2443402 - Disclosure - Business Segments (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BusinessSegmentsRevenuesByLineOfBusinessDetails" roleURI="http://www.cna.com/role/BusinessSegmentsRevenuesByLineOfBusinessDetails">
        <link:definition>2443405 - Disclosure - Business Segments (Revenues by Line of Business) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BusinessSegmentsTables" roleURI="http://www.cna.com/role/BusinessSegmentsTables">
        <link:definition>2343301 - Disclosure - Business Segments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReserves" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReserves">
        <link:definition>2122100 - Disclosure - Claim and Claim Adjustment Expense Reserves</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesCommercialCommercialAutoNetCumulativePaidClaimAndClaimAdjustmentExpensesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesCommercialCommercialAutoNetCumulativePaidClaimAndClaimAdjustmentExpensesDetails">
        <link:definition>2422421 - Disclosure - Claim and Claim Adjustment Expense Reserves (Commercial - Commercial Auto - Net Cumulative Paid Claim and Claim Adjustment Expenses) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesCommercialCommercialAutoNetIncurredClaimsAndAllocatedClaimAdjustmentExpensesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesCommercialCommercialAutoNetIncurredClaimsAndAllocatedClaimAdjustmentExpensesDetails">
        <link:definition>2422420 - Disclosure - Claim and Claim Adjustment Expense Reserves (Commercial - Commercial Auto - Net Incurred Claims and Allocated Claim Adjustment Expenses) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesCommercialCommercialAutoNetStrengtheningOrReleasingOfPriorAccidentYearReservesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesCommercialCommercialAutoNetStrengtheningOrReleasingOfPriorAccidentYearReservesDetails">
        <link:definition>2422422 - Disclosure - Claim and Claim Adjustment Expense Reserves (Commercial - Commercial Auto - Net Strengthening or Releasing of Prior Accident Year Reserves) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesCommercialCommercialAutoShortDurationContractsDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesCommercialCommercialAutoShortDurationContractsDetails">
        <link:definition>2422419 - Disclosure - Claim and Claim Adjustment Expense Reserves (Commercial - Commercial Auto - Short Duration Contracts) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesCommercialGeneralLiabilityNetCumulativePaidClaimAndClaimAdjustmentExpensesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesCommercialGeneralLiabilityNetCumulativePaidClaimAndClaimAdjustmentExpensesDetails">
        <link:definition>2422424 - Disclosure - Claim and Claim Adjustment Expense Reserves (Commercial - General Liability - Net Cumulative Paid Claim and Claim Adjustment Expenses) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesCommercialGeneralLiabilityNetIncurredClaimsAndAllocatedClaimAdjustmentExpensesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesCommercialGeneralLiabilityNetIncurredClaimsAndAllocatedClaimAdjustmentExpensesDetails">
        <link:definition>2422423 - Disclosure - Claim and Claim Adjustment Expense Reserves (Commercial - General Liability - Net Incurred Claims and Allocated Claim Adjustment Expenses) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesCommercialGeneralLiabilityNetStrengtheningOrReleasingOfPriorAccidentYearReservesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesCommercialGeneralLiabilityNetStrengtheningOrReleasingOfPriorAccidentYearReservesDetails">
        <link:definition>2422425 - Disclosure - Claim and Claim Adjustment Expense Reserves (Commercial - General Liability - Net Strengthening or Releasing of Prior Accident Year Reserves) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesCommercialNetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesCommercialNetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentDetails">
        <link:definition>2422418 - Disclosure - Claim and Claim Adjustment Expense Reserves (Commercial - Net prior year claim and allocated claim adjustment expense reserve development) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesCommercialWorkersCompensationNetCumulativePaidClaimAndClaimAdjustmentExpensesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesCommercialWorkersCompensationNetCumulativePaidClaimAndClaimAdjustmentExpensesDetails">
        <link:definition>2422427 - Disclosure - Claim and Claim Adjustment Expense Reserves (Commercial - Workers' Compensation - Net Cumulative Paid Claim and Claim Adjustment Expenses) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesCommercialWorkersCompensationNetIncurredClaimsAndAllocatedClaimAdjustmentExpensesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesCommercialWorkersCompensationNetIncurredClaimsAndAllocatedClaimAdjustmentExpensesDetails">
        <link:definition>2422426 - Disclosure - Claim and Claim Adjustment Expense Reserves (Commercial - Workers' Compensation - Net Incurred Claims and Allocated Claim Adjustment Expenses) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesCommercialWorkersCompensationNetStrengtheningOrReleasingOfPriorAccidentYearReservesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesCommercialWorkersCompensationNetStrengtheningOrReleasingOfPriorAccidentYearReservesDetails">
        <link:definition>2422428 - Disclosure - Claim and Claim Adjustment Expense Reserves (Commercial - Workers' Compensation - Net Strengthening or Releasing of Prior Accident Year Reserves) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesGrossAndNetCarriedClaimAndClaimAdjustmentExpenseReservesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesGrossAndNetCarriedClaimAndClaimAdjustmentExpenseReservesDetails">
        <link:definition>2422405 - Disclosure - Claim and Claim Adjustment Expense Reserves (Gross and net carried claim and claim adjustment expense reserves) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesHistoricalClaimsDurationDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesHistoricalClaimsDurationDetails">
        <link:definition>2422437 - Disclosure - Claim and Claim Adjustment Expense Reserves (Historical Claims Duration) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesImpactOfLossPortfolioTransferOnConsolidatedStatementOfOperationsDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesImpactOfLossPortfolioTransferOnConsolidatedStatementOfOperationsDetails">
        <link:definition>2422438 - Disclosure - Claim and Claim Adjustment Expense Reserves (Impact of Loss Portfolio Transfer on the Consolidated Statement of Operations) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesInternationalExcludingHardyNetCumulativePaidClaimAndClaimAdjustmentExpensesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesInternationalExcludingHardyNetCumulativePaidClaimAndClaimAdjustmentExpensesDetails">
        <link:definition>2422432 - Disclosure - Claim and Claim Adjustment Expense Reserves (International - Excluding Hardy - Net Cumulative Paid Claim and Claim Adjustment Expenses) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesInternationalExcludingHardyNetIncurredClaimsAndAllocatedClaimAdjustmentExpensesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesInternationalExcludingHardyNetIncurredClaimsAndAllocatedClaimAdjustmentExpensesDetails">
        <link:definition>2422431 - Disclosure - Claim and Claim Adjustment Expense Reserves (International - Excluding Hardy - Net Incurred Claims and Allocated Claim Adjustment Expenses) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesInternationalExcludingHardyNetStrengtheningOrReleasingOfPriorAccidentYearReservesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesInternationalExcludingHardyNetStrengtheningOrReleasingOfPriorAccidentYearReservesDetails">
        <link:definition>2422433 - Disclosure - Claim and Claim Adjustment Expense Reserves (International - Excluding Hardy - Net Strengthening or Releasing of Prior Accident Year Reserves) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesInternationalHardyNetCumulativePaidClaimAndClaimAdjustmentExpensesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesInternationalHardyNetCumulativePaidClaimAndClaimAdjustmentExpensesDetails">
        <link:definition>2422435 - Disclosure - Claim and Claim Adjustment Expense Reserves (International - Hardy - Net Cumulative Paid Claim and Claim Adjustment Expenses) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesInternationalHardyNetIncurredClaimsAndAllocatedClaimAdjustmentExpensesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesInternationalHardyNetIncurredClaimsAndAllocatedClaimAdjustmentExpensesDetails">
        <link:definition>2422434 - Disclosure - Claim and Claim Adjustment Expense Reserves (International - Hardy - Net Incurred Claims and Allocated Claim Adjustment Expenses) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesInternationalHardyNetStrengtheningOrReleasingOfPriorAccidentYearReservesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesInternationalHardyNetStrengtheningOrReleasingOfPriorAccidentYearReservesDetails">
        <link:definition>2422436 - Disclosure - Claim and Claim Adjustment Expense Reserves (International - Hardy - Net Strengthening or Releasing of Prior Accident Year Reserves) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesInternationalNetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesInternationalNetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentDetails">
        <link:definition>2422429 - Disclosure - Claim and Claim Adjustment Expense Reserves (International - Net prior year claim and allocated claim adjustment expense reserve development) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesInternationalShortDurationContractsDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesInternationalShortDurationContractsDetails">
        <link:definition>2422430 - Disclosure - Claim and Claim Adjustment Expense Reserves (International - Short Duration Contracts) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesLifeGroupPolicyholderReservesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesLifeGroupPolicyholderReservesDetails">
        <link:definition>2422439 - Disclosure - Claim and Claim Adjustment Expense Reserves (Life & Group Policyholder Reserves) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesNarrativeDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesNarrativeDetails">
        <link:definition>2422402 - Disclosure - Claim and Claim Adjustment Expense Reserves (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesNetPriorYearDevelopmentDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesNetPriorYearDevelopmentDetails">
        <link:definition>2422406 - Disclosure - Claim and Claim Adjustment Expense Reserves (Net prior year development) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesReconciliationOfClaimAndClaimAdjustmentExpenseReservesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesReconciliationOfClaimAndClaimAdjustmentExpenseReservesDetails">
        <link:definition>2422404 - Disclosure - Claim and Claim Adjustment Expense Reserves (Reconciliation of claim and claim adjustment expense reserves) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesReconciliationOfLiabilityForUnpaidClaimAndClaimAdjustmentExpenseDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesReconciliationOfLiabilityForUnpaidClaimAndClaimAdjustmentExpenseDetails">
        <link:definition>2422403 - Disclosure - Claim and Claim Adjustment Expense Reserves (Reconciliation of Liability for Unpaid Claim and Claim Adjustment Expense) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesSpecialtyLineOfBusinessCompositionDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesSpecialtyLineOfBusinessCompositionDetails">
        <link:definition>2422408 - Disclosure - Claim and Claim Adjustment Expense Reserves (Specialty - Line of Business Composition) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesSpecialtyMedicalProfessionalLiabilityCumulativeNetIncurredClaimsAndAllocatedClaimAdjustmentExpensesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesSpecialtyMedicalProfessionalLiabilityCumulativeNetIncurredClaimsAndAllocatedClaimAdjustmentExpensesDetails">
        <link:definition>2422409 - Disclosure - Claim and Claim Adjustment Expense Reserves (Specialty - Medical Professional Liability - Cumulative Net Incurred Claims and Allocated Claim Adjustment Expenses) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesSpecialtyMedicalProfessionalLiabilityNetCumulativePaidClaimAndClaimAdjustmentExpensesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesSpecialtyMedicalProfessionalLiabilityNetCumulativePaidClaimAndClaimAdjustmentExpensesDetails">
        <link:definition>2422410 - Disclosure - Claim and Claim Adjustment Expense Reserves (Specialty - Medical Professional Liability - Net Cumulative Paid Claim and Claim Adjustment Expenses) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesSpecialtyMedicalProfessionalLiabilityNetStrengtheningOrReleasingOfPriorAccidentYearReservesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesSpecialtyMedicalProfessionalLiabilityNetStrengtheningOrReleasingOfPriorAccidentYearReservesDetails">
        <link:definition>2422411 - Disclosure - Claim and Claim Adjustment Expense Reserves (Specialty - Medical Professional Liability -  Net Strengthening or Releasing of Prior Accident Year Reserves) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesSpecialtyNetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesSpecialtyNetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentDetails">
        <link:definition>2422407 - Disclosure - Claim and Claim Adjustment Expense Reserves (Specialty - Net prior year claim and allocated claim adjustment expense reserve development) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesSpecialtyOtherProfessionalLiabilityAndManagementLiabilityNetCumulativePaidClaimAndClaimAdjustmentExpensesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesSpecialtyOtherProfessionalLiabilityAndManagementLiabilityNetCumulativePaidClaimAndClaimAdjustmentExpensesDetails">
        <link:definition>2422413 - Disclosure - Claim and Claim Adjustment Expense Reserves (Specialty - Other Professional Liability and Management Liability - Net Cumulative Paid Claim and Claim Adjustment Expenses) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesSpecialtyOtherProfessionalLiabilityAndManagementLiabilityNetIncurredClaimsAndAllocatedClaimAdjustmentExpensesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesSpecialtyOtherProfessionalLiabilityAndManagementLiabilityNetIncurredClaimsAndAllocatedClaimAdjustmentExpensesDetails">
        <link:definition>2422412 - Disclosure - Claim and Claim Adjustment Expense Reserves (Specialty - Other Professional Liability and Management Liability - Net Incurred Claims and Allocated Claim Adjustment Expenses) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesSpecialtyOtherProfessionalLiabilityAndManagementLiabilityNetStrengtheningOrReleasingOfPriorAccidentYearReservesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesSpecialtyOtherProfessionalLiabilityAndManagementLiabilityNetStrengtheningOrReleasingOfPriorAccidentYearReservesDetails">
        <link:definition>2422414 - Disclosure - Claim and Claim Adjustment Expense Reserves (Specialty - Other Professional Liability and Management Liability - Net Strengthening or Releasing of Prior Accident Year Reserves) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesSpecialtySuretyNetCumulativePaidClaimAndClaimAdjustmentExpensesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesSpecialtySuretyNetCumulativePaidClaimAndClaimAdjustmentExpensesDetails">
        <link:definition>2422416 - Disclosure - Claim and Claim Adjustment Expense Reserves (Specialty - Surety - Net Cumulative Paid Claim and Claim Adjustment Expenses) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesSpecialtySuretyNetIncurredClaimsAndAllocatedClaimAdjustmentExpensesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesSpecialtySuretyNetIncurredClaimsAndAllocatedClaimAdjustmentExpensesDetails">
        <link:definition>2422415 - Disclosure - Claim and Claim Adjustment Expense Reserves (Specialty - Surety - Net Incurred Claims and Allocated Claim Adjustment Expenses) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesSpecialtySuretyNetStrengtheningOrReleasingOfPriorAccidentYearReservesDetails" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesSpecialtySuretyNetStrengtheningOrReleasingOfPriorAccidentYearReservesDetails">
        <link:definition>2422417 - Disclosure - Claim and Claim Adjustment Expense Reserves (Specialty - Surety - Net Strengthening or Releasing of Prior Accident Year Reserves) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ClaimAndClaimAdjustmentExpenseReservesTables" roleURI="http://www.cna.com/role/ClaimAndClaimAdjustmentExpenseReservesTables">
        <link:definition>2322301 - Disclosure - Claim and Claim Adjustment Expense Reserves (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheets" roleURI="http://www.cna.com/role/ConsolidatedBalanceSheets">
        <link:definition>1004000 - Statement - Consolidated Balance Sheets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheetsParenthetical" roleURI="http://www.cna.com/role/ConsolidatedBalanceSheetsParenthetical">
        <link:definition>1004001 - Statement - Consolidated Balance Sheets - (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsOfCashFlows" roleURI="http://www.cna.com/role/ConsolidatedStatementsOfCashFlows">
        <link:definition>1006000 - Statement - Consolidated Statements of Cash Flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsOfComprehensiveIncomeLoss" roleURI="http://www.cna.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss">
        <link:definition>1003000 - Statement - Consolidated Statements of Comprehensive Income (Loss)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsOfOperations" roleURI="http://www.cna.com/role/ConsolidatedStatementsOfOperations">
        <link:definition>1001000 - Statement - Consolidated Statements of Operations</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsOfStockholdersEquity" roleURI="http://www.cna.com/role/ConsolidatedStatementsOfStockholdersEquity">
        <link:definition>1007000 - Statement - Consolidated Statements of Stockholders' Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsOfStockholdersEquityParenthetical" roleURI="http://www.cna.com/role/ConsolidatedStatementsOfStockholdersEquityParenthetical">
        <link:definition>1007001 - Statement - Consolidated Statements of Stockholders' Equity - (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CoverPageCoverPage" roleURI="http://www.cna.com/role/CoverPageCoverPage">
        <link:definition>0001000 - Document - Cover Page Cover Page</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Debt" roleURI="http://www.cna.com/role/Debt">
        <link:definition>2130100 - Disclosure - Debt</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtMaturityOfDebtDetails" roleURI="http://www.cna.com/role/DebtMaturityOfDebtDetails">
        <link:definition>2430404 - Disclosure - Debt (Maturity of debt) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtNarrativeDetails" roleURI="http://www.cna.com/role/DebtNarrativeDetails">
        <link:definition>2430402 - Disclosure - Debt (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtScheduleOfDebtInstrumentsDetails" roleURI="http://www.cna.com/role/DebtScheduleOfDebtInstrumentsDetails">
        <link:definition>2430403 - Disclosure - Debt (Schedule of debt instruments) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtTables" roleURI="http://www.cna.com/role/DebtTables">
        <link:definition>2330301 - Disclosure - Debt (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValue" roleURI="http://www.cna.com/role/FairValue">
        <link:definition>2116100 - Disclosure - Fair Value</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" roleURI="http://www.cna.com/role/FairValueAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails">
        <link:definition>2416402 - Disclosure - Fair Value (Assets and liabilities measured at fair value on a recurring basis) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueCarryingAmountAndEstimatedFairValueOfFinancialInstrumentAssetsAndLiabilitiesWhichAreNotMeasuredAtFairValueDetails" roleURI="http://www.cna.com/role/FairValueCarryingAmountAndEstimatedFairValueOfFinancialInstrumentAssetsAndLiabilitiesWhichAreNotMeasuredAtFairValueDetails">
        <link:definition>2416406 - Disclosure - Fair Value (Carrying amount and estimated fair value of financial instrument assets and liabilities which are not measured at fair value) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueNarrativeDetails" roleURI="http://www.cna.com/role/FairValueNarrativeDetails">
        <link:definition>2416404 - Disclosure - Fair Value (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueQuantitativeInformationAboutSignificantUnobservableInputsInFairValueMeasurementOfLevel3AssetsDetails" roleURI="http://www.cna.com/role/FairValueQuantitativeInformationAboutSignificantUnobservableInputsInFairValueMeasurementOfLevel3AssetsDetails">
        <link:definition>2416405 - Disclosure - Fair Value (Quantitative information about significant unobservable inputs in the fair value measurement of level 3 assets) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueTableOfReconciliationForAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisUsingSignificantUnobservableInputsDetails" roleURI="http://www.cna.com/role/FairValueTableOfReconciliationForAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisUsingSignificantUnobservableInputsDetails">
        <link:definition>2416403 - Disclosure - Fair Value (Table of reconciliation for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueTables" roleURI="http://www.cna.com/role/FairValueTables">
        <link:definition>2316301 - Disclosure - Fair Value (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxes" roleURI="http://www.cna.com/role/IncomeTaxes">
        <link:definition>2119100 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesCurrentAndDeferredComponentsOfCompanysIncomeTaxExpenseBenefitDetails" roleURI="http://www.cna.com/role/IncomeTaxesCurrentAndDeferredComponentsOfCompanysIncomeTaxExpenseBenefitDetails">
        <link:definition>2419404 - Disclosure - Income Taxes (Current and deferred components of the Company's income tax (expense) benefit) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesNarrativeDetails" roleURI="http://www.cna.com/role/IncomeTaxesNarrativeDetails">
        <link:definition>2419402 - Disclosure - Income Taxes (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesReconciliationBetweenCompanysFederalIncomeTaxExpenseBenefitAtStatutoryRatesAndRecordedIncomeTaxExpenseBenefitDetails" roleURI="http://www.cna.com/role/IncomeTaxesReconciliationBetweenCompanysFederalIncomeTaxExpenseBenefitAtStatutoryRatesAndRecordedIncomeTaxExpenseBenefitDetails">
        <link:definition>2419403 - Disclosure - Income Taxes (Reconciliation between the Company's federal income tax (expense) benefit at statutory rates and the recorded income tax (expense) benefit) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesSignificantComponentsOfCompanysDeferredTaxAssetsAndLiabilitiesDetails" roleURI="http://www.cna.com/role/IncomeTaxesSignificantComponentsOfCompanysDeferredTaxAssetsAndLiabilitiesDetails">
        <link:definition>2419405 - Disclosure - Income Taxes (Significant components of the Company's deferred tax assets and liabilities) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesTables" roleURI="http://www.cna.com/role/IncomeTaxesTables">
        <link:definition>2319301 - Disclosure - Income Taxes (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Investments" roleURI="http://www.cna.com/role/Investments">
        <link:definition>2108100 - Disclosure - Investments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsActivityRelatedToPretaxFixedMaturityCreditLossComponentReflectedWithinRetainedEarningsForSecuritiesStillHeldForWhichPortionOfOttiLossWasRecognizedInOciDetails" roleURI="http://www.cna.com/role/InvestmentsActivityRelatedToPretaxFixedMaturityCreditLossComponentReflectedWithinRetainedEarningsForSecuritiesStillHeldForWhichPortionOfOttiLossWasRecognizedInOciDetails">
        <link:definition>2408409 - Disclosure - Investments (Activity related to the pretax fixed maturity credit loss component reflected within retained earnings for securities still held for which a portion of an OTTI loss was recognized in OCI) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsComponentsOfOtherThanTemporaryImpairmentLossesRecognizedInEarningsDetails" roleURI="http://www.cna.com/role/InvestmentsComponentsOfOtherThanTemporaryImpairmentLossesRecognizedInEarningsDetails">
        <link:definition>2408406 - Disclosure - Investments (Components of other-than-temporary impairment losses recognized in earnings) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsContractualMaturityDetails" roleURI="http://www.cna.com/role/InvestmentsContractualMaturityDetails">
        <link:definition>2408410 - Disclosure - Investments (Contractual maturity) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsNarrativeDetails" roleURI="http://www.cna.com/role/InvestmentsNarrativeDetails">
        <link:definition>2408403 - Disclosure - Investments (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsNetChangeInUnrealizedGainsLossesOnInvestmentsDetails" roleURI="http://www.cna.com/role/InvestmentsNetChangeInUnrealizedGainsLossesOnInvestmentsDetails">
        <link:definition>2408405 - Disclosure - Investments (Net change in unrealized gains (losses) on investments) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsNetInvestmentIncomeDetails" roleURI="http://www.cna.com/role/InvestmentsNetInvestmentIncomeDetails">
        <link:definition>2408402 - Disclosure - Investments (Net investment income) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsNetRealizedInvestmentGainsLossesDetails" roleURI="http://www.cna.com/role/InvestmentsNetRealizedInvestmentGainsLossesDetails">
        <link:definition>2408404 - Disclosure - Investments (Net realized investment gains (losses)) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsSecuritiesInGrossUnrealizedLossPositionDetails" roleURI="http://www.cna.com/role/InvestmentsSecuritiesInGrossUnrealizedLossPositionDetails">
        <link:definition>2408408 - Disclosure - Investments (Securities in a gross unrealized loss position) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsSummaryOfFixedMaturityAndEquitySecuritiesDetails" roleURI="http://www.cna.com/role/InvestmentsSummaryOfFixedMaturityAndEquitySecuritiesDetails">
        <link:definition>2408407 - Disclosure - Investments (Summary of fixed maturity and equity securities) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsSummaryOfFixedMaturityAndEquitySecuritiesDetailsCalc2" roleURI="http://www.cna.com/role/InvestmentsSummaryOfFixedMaturityAndEquitySecuritiesDetailsCalc2">
        <link:definition>2408407 - Disclosure - Investments (Summary of fixed maturity and equity securities) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsTables" roleURI="http://www.cna.com/role/InvestmentsTables">
        <link:definition>2308301 - Disclosure - Investments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Leases" roleURI="http://www.cna.com/role/Leases">
        <link:definition>2138100 - Disclosure - Leases</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesAssetsAndLiabilitiesDetails" roleURI="http://www.cna.com/role/LeasesAssetsAndLiabilitiesDetails">
        <link:definition>2438403 - Disclosure - Leases (Assets and Liabilities) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesFutureMinimumLeasePaymentsDetails" roleURI="http://www.cna.com/role/LeasesFutureMinimumLeasePaymentsDetails">
        <link:definition>2438406 - Disclosure - Leases (Future Minimum Lease Payments) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesLeaseTermAndDiscountRateDetails" roleURI="http://www.cna.com/role/LeasesLeaseTermAndDiscountRateDetails">
        <link:definition>2438405 - Disclosure - Leases (Lease Term and Discount Rate) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesMaturitiesDetails" roleURI="http://www.cna.com/role/LeasesMaturitiesDetails">
        <link:definition>2438404 - Disclosure - Leases (Maturities) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesMaturitiesDetailsCalc2" roleURI="http://www.cna.com/role/LeasesMaturitiesDetailsCalc2">
        <link:definition>2438404 - Disclosure - Leases (Maturities) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesNarrativeDetail" roleURI="http://www.cna.com/role/LeasesNarrativeDetail">
        <link:definition>2438402 - Disclosure - Leases (Narrative) (Detail)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesTables" roleURI="http://www.cna.com/role/LeasesTables">
        <link:definition>2338301 - Disclosure - Leases (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LegalProceedingsContingenciesAndGuarantees" roleURI="http://www.cna.com/role/LegalProceedingsContingenciesAndGuarantees">
        <link:definition>2128100 - Disclosure - Legal Proceedings, Contingencies and Guarantees</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LegalProceedingsContingenciesAndGuaranteesNarrativeDetails" roleURI="http://www.cna.com/role/LegalProceedingsContingenciesAndGuaranteesNarrativeDetails">
        <link:definition>2428401 - Disclosure - Legal Proceedings, Contingencies and Guarantees (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NonInsuranceRevenuesFromContractsWithCustomers" roleURI="http://www.cna.com/role/NonInsuranceRevenuesFromContractsWithCustomers">
        <link:definition>2150100 - Disclosure - Non-Insurance Revenues from Contracts with Customers</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NonInsuranceRevenuesFromContractsWithCustomersNarrativeDetails" roleURI="http://www.cna.com/role/NonInsuranceRevenuesFromContractsWithCustomersNarrativeDetails">
        <link:definition>2450401 - Disclosure - Non-Insurance Revenues from Contracts with Customers (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NonInsuranceRevenuesFromContractsWithCustomersPerformanceObligationDetails" roleURI="http://www.cna.com/role/NonInsuranceRevenuesFromContractsWithCustomersPerformanceObligationDetails">
        <link:definition>2450402 - Disclosure - Non-Insurance Revenues from Contracts with Customers (Performance Obligation) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherIntangibleAssets" roleURI="http://www.cna.com/role/OtherIntangibleAssets">
        <link:definition>2136100 - Disclosure - Other Intangible Assets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherIntangibleAssetsSummaryOfOtherIntangibleAssetsDetails" roleURI="http://www.cna.com/role/OtherIntangibleAssetsSummaryOfOtherIntangibleAssetsDetails">
        <link:definition>2436402 - Disclosure - Other Intangible Assets (Summary of Other Intangible Assets) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherIntangibleAssetsTables" roleURI="http://www.cna.com/role/OtherIntangibleAssetsTables">
        <link:definition>2336301 - Disclosure - Other Intangible Assets (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="QuarterlyFinancialDataUnaudited" roleURI="http://www.cna.com/role/QuarterlyFinancialDataUnaudited">
        <link:definition>2144100 - Disclosure - Quarterly Financial Data (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="QuarterlyFinancialDataUnauditedDetails" roleURI="http://www.cna.com/role/QuarterlyFinancialDataUnauditedDetails">
        <link:definition>2444402 - Disclosure - Quarterly Financial Data (Unaudited) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="QuarterlyFinancialDataUnauditedDetailsCalc2" roleURI="http://www.cna.com/role/QuarterlyFinancialDataUnauditedDetailsCalc2">
        <link:definition>2444402 - Disclosure - Quarterly Financial Data (Unaudited) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="QuarterlyFinancialDataUnauditedTables" roleURI="http://www.cna.com/role/QuarterlyFinancialDataUnauditedTables">
        <link:definition>2344301 - Disclosure - Quarterly Financial Data (Unaudited) (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Reinsurance" roleURI="http://www.cna.com/role/Reinsurance">
        <link:definition>2129100 - Disclosure - Reinsurance</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ReinsuranceComponentsOfEarnedPremiumsDetails" roleURI="http://www.cna.com/role/ReinsuranceComponentsOfEarnedPremiumsDetails">
        <link:definition>2429404 - Disclosure - Reinsurance (Components of Earned Premiums) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ReinsuranceComponentsOfReinsuranceReceivablesDetails" roleURI="http://www.cna.com/role/ReinsuranceComponentsOfReinsuranceReceivablesDetails">
        <link:definition>2429403 - Disclosure - Reinsurance (Components of Reinsurance Receivables) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ReinsuranceComponentsOfWrittenPremiumsDetails" roleURI="http://www.cna.com/role/ReinsuranceComponentsOfWrittenPremiumsDetails">
        <link:definition>2429405 - Disclosure - Reinsurance (Components of Written Premiums) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ReinsuranceNarrativeDetails" roleURI="http://www.cna.com/role/ReinsuranceNarrativeDetails">
        <link:definition>2429402 - Disclosure - Reinsurance (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ReinsuranceTables" roleURI="http://www.cna.com/role/ReinsuranceTables">
        <link:definition>2329301 - Disclosure - Reinsurance (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RelatedPartyTransactions" roleURI="http://www.cna.com/role/RelatedPartyTransactions">
        <link:definition>2145100 - Disclosure - Related Party Transactions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RelatedPartyTransactionsNarrativeDetails" roleURI="http://www.cna.com/role/RelatedPartyTransactionsNarrativeDetails">
        <link:definition>2445401 - Disclosure - Related Party Transactions Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleISummaryOfInvestmentsOtherThanInvestmentsInRelatedParties" roleURI="http://www.cna.com/role/ScheduleISummaryOfInvestmentsOtherThanInvestmentsInRelatedParties">
        <link:definition>2151100 - Disclosure - Schedule I. Summary of Investments - Other Than Investments in Related Parties</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleIiCondensedFinancialInformationOfRegistrantParentCompany" roleURI="http://www.cna.com/role/ScheduleIiCondensedFinancialInformationOfRegistrantParentCompany">
        <link:definition>2152100 - Disclosure - Schedule II. Condensed Financial Information of Registrant (Parent Company)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleIiCondensedFinancialInformationOfRegistrantParentCompanyNarrativeDetails" roleURI="http://www.cna.com/role/ScheduleIiCondensedFinancialInformationOfRegistrantParentCompanyNarrativeDetails">
        <link:definition>2452404 - Disclosure - Schedule II. Condensed Financial Information of Registrant (Parent Company) (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleIiCondensedFinancialInformationOfRegistrantParentCompanyScheduleOfCondensedFinancialInformationOfRegistrantBalanceSheetsDetails" roleURI="http://www.cna.com/role/ScheduleIiCondensedFinancialInformationOfRegistrantParentCompanyScheduleOfCondensedFinancialInformationOfRegistrantBalanceSheetsDetails">
        <link:definition>2452402 - Disclosure - Schedule II. Condensed Financial Information of Registrant (Parent Company) (Schedule of Condensed Financial Information of Registrant, Balance Sheets) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleIiCondensedFinancialInformationOfRegistrantParentCompanyScheduleOfCondensedFinancialInformationOfRegistrantStatementsOfCashFlowsDetails" roleURI="http://www.cna.com/role/ScheduleIiCondensedFinancialInformationOfRegistrantParentCompanyScheduleOfCondensedFinancialInformationOfRegistrantStatementsOfCashFlowsDetails">
        <link:definition>2452403 - Disclosure - Schedule II. Condensed Financial Information of Registrant (Parent Company) (Schedule of Condensed Financial Information of Registrant, Statements of Cash Flows) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleIiCondensedFinancialInformationOfRegistrantParentCompanyScheduleOfCondensedFinancialInformationOfRegistrantStatementsOfOperationsAndComprehensiveIncomeLossDetails" roleURI="http://www.cna.com/role/ScheduleIiCondensedFinancialInformationOfRegistrantParentCompanyScheduleOfCondensedFinancialInformationOfRegistrantStatementsOfOperationsAndComprehensiveIncomeLossDetails">
        <link:definition>2452401 - Disclosure - Schedule II. Condensed Financial Information of Registrant (Parent Company) (Schedule of Condensed Financial Information of Registrant, Statements of Operations and Comprehensive Income (Loss)) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleIiiSupplementaryInsuranceInformation" roleURI="http://www.cna.com/role/ScheduleIiiSupplementaryInsuranceInformation">
        <link:definition>2153100 - Disclosure - Schedule III. Supplementary Insurance Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleIvReinsurance" roleURI="http://www.cna.com/role/ScheduleIvReinsurance">
        <link:definition>2154100 - Disclosure - Schedule IV. Reinsurance</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleOfOtherIntangibleAssetsNarrativeDetails" roleURI="http://www.cna.com/role/ScheduleOfOtherIntangibleAssetsNarrativeDetails">
        <link:definition>2436403 - Disclosure - Schedule of Other Intangible Assets (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleVValuationAndQualifyingAccounts" roleURI="http://www.cna.com/role/ScheduleVValuationAndQualifyingAccounts">
        <link:definition>2155100 - Disclosure - Schedule V. Valuation and Qualifying Accounts</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleVValuationAndQualifyingAccountsScheduleOfValuationAndQualifyingAccountsDetails" roleURI="http://www.cna.com/role/ScheduleVValuationAndQualifyingAccountsScheduleOfValuationAndQualifyingAccountsDetails">
        <link:definition>2455401 - Disclosure - Schedule V. Valuation and Qualifying Accounts (Schedule of valuation and qualifying accounts) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleViSupplementalInformationConcerningPropertyAndCasualtyInsuranceOperations" roleURI="http://www.cna.com/role/ScheduleViSupplementalInformationConcerningPropertyAndCasualtyInsuranceOperations">
        <link:definition>2156100 - Disclosure - Schedule VI. Supplemental Information Concerning Property and Casualty Insurance Operations</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleViSupplementalInformationConcerningPropertyAndCasualtyInsuranceOperationsDetails" roleURI="http://www.cna.com/role/ScheduleViSupplementalInformationConcerningPropertyAndCasualtyInsuranceOperationsDetails">
        <link:definition>2456401 - Disclosure - Schedule VI. Supplemental Information Concerning Property and Casualty Insurance Operations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockBasedCompensation" roleURI="http://www.cna.com/role/StockBasedCompensation">
        <link:definition>2134100 - Disclosure - Stock-Based Compensation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockBasedCompensationNarrativeDetails" roleURI="http://www.cna.com/role/StockBasedCompensationNarrativeDetails">
        <link:definition>2434402 - Disclosure - Stock-Based Compensation (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockBasedCompensationRestrictedSharesPerformanceBasedRestrictedShareUnitsAndPerformanceShareUnitActivityDetails" roleURI="http://www.cna.com/role/StockBasedCompensationRestrictedSharesPerformanceBasedRestrictedShareUnitsAndPerformanceShareUnitActivityDetails">
        <link:definition>2434403 - Disclosure - Stock-Based Compensation (Restricted shares, performance-based restricted share units and performance share unit activity) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockBasedCompensationTables" roleURI="http://www.cna.com/role/StockBasedCompensationTables">
        <link:definition>2334301 - Disclosure - Stock-Based Compensation (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityAndStatutoryAccountingPractices" roleURI="http://www.cna.com/role/StockholdersEquityAndStatutoryAccountingPractices">
        <link:definition>2141100 - Disclosure - Stockholders' Equity and Statutory Accounting Practices</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityAndStatutoryAccountingPracticesCombinedStatutoryCapitalAndSurplusAndNetIncomeLossDetails" roleURI="http://www.cna.com/role/StockholdersEquityAndStatutoryAccountingPracticesCombinedStatutoryCapitalAndSurplusAndNetIncomeLossDetails">
        <link:definition>2441403 - Disclosure - Stockholders' Equity and Statutory Accounting Practices Combined statutory capital and surplus and net income (loss) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityAndStatutoryAccountingPracticesNarrativeDetails" roleURI="http://www.cna.com/role/StockholdersEquityAndStatutoryAccountingPracticesNarrativeDetails">
        <link:definition>2441402 - Disclosure - Stockholders' Equity and Statutory Accounting Practices (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityAndStatutoryAccountingPracticesTables" roleURI="http://www.cna.com/role/StockholdersEquityAndStatutoryAccountingPracticesTables">
        <link:definition>2341301 - Disclosure - Stockholders' Equity and Statutory Accounting Practices (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryOfSignificantAccountingPolicies" roleURI="http://www.cna.com/role/SummaryOfSignificantAccountingPolicies">
        <link:definition>2101100 - Disclosure - Summary of Significant Accounting Policies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryOfSignificantAccountingPoliciesAdoptionOfUpdatedGuidanceDetails" roleURI="http://www.cna.com/role/SummaryOfSignificantAccountingPoliciesAdoptionOfUpdatedGuidanceDetails">
        <link:definition>2401404 - Disclosure - Summary of Significant Accounting Policies (Adoption of Updated Guidance) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryOfSignificantAccountingPoliciesCumulativeEffectToConsolidatedBalanceSheetDetails" roleURI="http://www.cna.com/role/SummaryOfSignificantAccountingPoliciesCumulativeEffectToConsolidatedBalanceSheetDetails">
        <link:definition>2401405 - Disclosure - Summary of Significant Accounting Policies (Cumulative Effect to the Consolidated Balance Sheet) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryOfSignificantAccountingPoliciesImpactOfAdoptionOnConsolidatedStatementsOfOperationsAndBalanceSheetDetails" roleURI="http://www.cna.com/role/SummaryOfSignificantAccountingPoliciesImpactOfAdoptionOnConsolidatedStatementsOfOperationsAndBalanceSheetDetails">
        <link:definition>2401406 - Disclosure - Summary of Significant Accounting Policies (Impact of adoption on the Consolidated Statements of Operations and Balance Sheet) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryOfSignificantAccountingPoliciesNarrativeDetails" roleURI="http://www.cna.com/role/SummaryOfSignificantAccountingPoliciesNarrativeDetails">
        <link:definition>2401403 - Disclosure - Summary of Significant Accounting Policies (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryOfSignificantAccountingPoliciesPolicies" roleURI="http://www.cna.com/role/SummaryOfSignificantAccountingPoliciesPolicies">
        <link:definition>2201201 - Disclosure - Summary of Significant Accounting Policies (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryOfSignificantAccountingPoliciesSummaryOfSignificantAccountingPoliciesTables" roleURI="http://www.cna.com/role/SummaryOfSignificantAccountingPoliciesSummaryOfSignificantAccountingPoliciesTables">
        <link:definition>2301302 - Disclosure - Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:element id="cna_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossBeforeTaxDebtSecurities" name="AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossBeforeTaxDebtSecurities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cna_AdditionalContributionManagementDiscretionMember" name="AdditionalContributionManagementDiscretionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_AdjustmentforDevelopmentonaDiscountedBasis" name="AdjustmentforDevelopmentonaDiscountedBasis" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_AgencyForceMember" name="AgencyForceMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_AggregateLimitUnderAepLossPortfolioTransfer" name="AggregateLimitUnderAepLossPortfolioTransfer" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cna_AmortizationExpenseIncludedInOtherOperatingExpenses" name="AmortizationExpenseIncludedInOtherOperatingExpenses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_Amountofinterestaccretionrecognizedonthediscountedreservesofworkerscompensationlifetimeclaimreserves" name="Amountofinterestaccretionrecognizedonthediscountedreservesofworkerscompensationlifetimeclaimreserves" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cna_Amountofinterestrecognizedonthediscountedreservesofunfundedstructuredsettlements" name="Amountofinterestrecognizedonthediscountedreservesofunfundedstructuredsettlements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cna_AnticipatedAmountsDueFromInsuredsRelatedToLossesUnderDeductiblePolicies" name="AnticipatedAmountsDueFromInsuredsRelatedToLossesUnderDeductiblePolicies" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cna_AsbestosandEnvironmentalReservesMember" name="AsbestosandEnvironmentalReservesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_AssetsandLiabilitiesLesseeTableTextBlock" name="AssetsandLiabilitiesLesseeTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_AssetsforPlanBenefitsDefinedBenefitPlanPartnershipInterest" name="AssetsforPlanBenefitsDefinedBenefitPlanPartnershipInterest" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cna_Assumptionsusedincalculatingassumedhealthcarecosttrendrate" name="Assumptionsusedincalculatingassumedhealthcarecosttrendrate" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_AvailableforsaleandTradingSecuritiesTableTextBlock" name="AvailableforsaleandTradingSecuritiesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_CNAEuropeMember" name="CNAEuropeMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_CNAFConsolidatedMember" name="CNAFConsolidatedMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_CanadaMember" name="CanadaMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_CapitalContributionstoSubsidiaries" name="CapitalContributionstoSubsidiaries" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_CapitalizedAdministratorServiceCostsMember" name="CapitalizedAdministratorServiceCostsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_CapitalizedCommissionCostsMember" name="CapitalizedCommissionCostsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_CarryingValueOfLimitedPartnershipsAsPercentageOfAggregatePartnershipEquity" name="CarryingValueOfLimitedPartnershipsAsPercentageOfAggregatePartnershipEquity" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="cna_CarryingValueOfSecuritiesDepositedUnderRequirementsOfRegulatoryAuthorities" name="CarryingValueOfSecuritiesDepositedUnderRequirementsOfRegulatoryAuthorities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cna_CarryingValueOfTenLargestLimitedPartnerships" name="CarryingValueOfTenLargestLimitedPartnerships" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cna_CashAndSecuritiesDepositedAsCollateralForLettersOfCredit" name="CashAndSecuritiesDepositedAsCollateralForLettersOfCredit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cna_CatastropheLossesNetOfReinsurance" name="CatastropheLossesNetOfReinsurance" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_CededClaimAndClaimAdjustmentExpenses" name="CededClaimAndClaimAdjustmentExpenses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cna_CededFuturePolicyBenefits" name="CededFuturePolicyBenefits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cna_ChangeInOtherInvestments" name="ChangeInOtherInvestments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_ChangeInShortTermInvestments" name="ChangeInShortTermInvestments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_ClaimAndAllocatedClaimAdjustmentExpenseReservesUnderExistingThirdPartyReinsuranceContracts" name="ClaimAndAllocatedClaimAdjustmentExpenseReservesUnderExistingThirdPartyReinsuranceContracts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cna_CliffVestingPeriodFollowingDateofGrant" name="CliffVestingPeriodFollowingDateofGrant" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_CombinedContinentalCasualtyCompaniesMember" name="CombinedContinentalCasualtyCompaniesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_CommercialAutoProductLineMember" name="CommercialAutoProductLineMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_CommercialMember" name="CommercialMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_CommitmentsToPurchaseOrFundAdditionalAmounts" name="CommitmentsToPurchaseOrFundAdditionalAmounts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cna_CommitmentsToSellVariousPrivatelyPlacedDebtSecurities" name="CommitmentsToSellVariousPrivatelyPlacedDebtSecurities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cna_CompanyContributionofEligibleCompensationDependingonAgePercent" name="CompanyContributionofEligibleCompensationDependingonAgePercent" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_ComponentsOfNetOtherThanTemporaryImpairmentLossesRecognizedInEarningsByAssetTypeTableTextBlock" name="ComponentsOfNetOtherThanTemporaryImpairmentLossesRecognizedInEarningsByAssetTypeTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_CoreSegmentsSpecialtyCommercialAndInternationalMember" name="CoreSegmentsSpecialtyCommercialAndInternationalMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_CorporateServicesandRelatedTravelExpensesMember" name="CorporateServicesandRelatedTravelExpensesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_CostsFromContractWithCustomers" name="CostsFromContractWithCustomers" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_CumulativeamountscededunderAEPLossPortfolioTransfer" name="CumulativeamountscededunderAEPLossPortfolioTransfer" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cna_DebtSecuritiesAmortizedCost" name="DebtSecuritiesAmortizedCost" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cna_DeferredIncomeTaxExpenseBenefitRemeasurementofDeferredTaxAsset" name="DeferredIncomeTaxExpenseBenefitRemeasurementofDeferredTaxAsset" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_DeferredTaxAssetsDeferredRetroactiveReinsuranceBenefit" name="DeferredTaxAssetsDeferredRetroactiveReinsuranceBenefit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cna_DeferredTaxLiabilitiesDeferredExpenseSoftwareandHardware" name="DeferredTaxLiabilitiesDeferredExpenseSoftwareandHardware" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cna_Deferredreinsurancebenefityettoberecognized" name="Deferredreinsurancebenefityettoberecognized" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cna_DefinedBenefitPlanForeignCurrencyTranslationAndOtherOnBenefitObligation" name="DefinedBenefitPlanForeignCurrencyTranslationAndOtherOnBenefitObligation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cna_DefinedBenefitPlanForeignCurrencyTranslationAndOtherOnPlanAssets" name="DefinedBenefitPlanForeignCurrencyTranslationAndOtherOnPlanAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_DefinedContributionPlanAxis" name="DefinedContributionPlanAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_DefinedContributionPlanDomain" name="DefinedContributionPlanDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_DefinedContributionPlanEmployerDiscretionaryContributionAmountPercent" name="DefinedContributionPlanEmployerDiscretionaryContributionAmountPercent" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_DefinedContributionPlanEmployersMatchingContributionVestingPeriodinYears" name="DefinedContributionPlanEmployersMatchingContributionVestingPeriodinYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_DirectAndCededEarnedPremiumsRelatedToBusinessThatIsOneHundredPercentReinsuredAsResultOfSignificantCaptiveProgram" name="DirectAndCededEarnedPremiumsRelatedToBusinessThatIsOneHundredPercentReinsuredAsResultOfSignificantCaptiveProgram" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_DiscountedReservesForUnfundedStructureSettlementsDiscountAmount" name="DiscountedReservesForUnfundedStructureSettlementsDiscountAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cna_DiscountedReservesForUnfundedStructuredSettlements" name="DiscountedReservesForUnfundedStructuredSettlements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cna_Discountedreservesforlongtermcareclaimreserves" name="Discountedreservesforlongtermcareclaimreserves" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cna_Discountedreservesforlongtermcareclaimreservesdiscountamount" name="Discountedreservesforlongtermcareclaimreservesdiscountamount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cna_EffectiveIncomeTaxRateReconciliationEffectofTaxCutsandJobsActof2017Amount" name="EffectiveIncomeTaxRateReconciliationEffectofTaxCutsandJobsActof2017Amount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cna_EquityInNetIncomeLossOfSubsidiaries" name="EquityInNetIncomeLossOfSubsidiaries" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cna_EquityInOtherComprehensiveIncomeOfSubsidiaries" name="EquityInOtherComprehensiveIncomeOfSubsidiaries" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_ExcludingHardyMember" name="ExcludingHardyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsAndOtherComprehensiveIncomeLoss" name="FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsAndOtherComprehensiveIncomeLoss" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cna_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedinNetInvestmentIncome" name="FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedinNetInvestmentIncome" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cna_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetUnrealizedGainLossIncludedinOtherComprehensiveIncomeLoss" name="FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetUnrealizedGainLossIncludedinOtherComprehensiveIncomeLoss" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cna_FairValueOfCollateralTrustAccountEstablishedByNicoUnderAepLossPortfolioTransfer" name="FairValueOfCollateralTrustAccountEstablishedByNicoUnderAepLossPortfolioTransfer" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cna_FederalIncomeTaxesMember" name="FederalIncomeTaxesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_FeesandexpensesofinvestmentfacilitiesandservicesMember" name="FeesandexpensesofinvestmentfacilitiesandservicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_FirstYearofEmploymentMember" name="FirstYearofEmploymentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_FutureCapitalCallCommitments" name="FutureCapitalCallCommitments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cna_GrossAndNetCarriedClaimAndClaimAdjustmentExpenseReservesTableTextBlock" name="GrossAndNetCarriedClaimAndClaimAdjustmentExpenseReservesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_GuaranteeandIndemnificationMember" name="GuaranteeandIndemnificationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_GuarantyFundAndOtherInsuranceRelatedAssessmentsPolicyTextBlock" name="GuarantyFundAndOtherInsuranceRelatedAssessmentsPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_HardyMember" name="HardyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_HurricaneMichaelandCaliforniaWildfiresMember" name="HurricaneMichaelandCaliforniaWildfiresMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_ImpactOfLossPortfolioTransferOnConsolidatedStatementsOfOperationsTableTextBlock" name="ImpactOfLossPortfolioTransferOnConsolidatedStatementsOfOperationsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_ImpairmentsOtherThanTemporaryPolicyTextBlock" name="ImpairmentsOtherThanTemporaryPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_IncomeAsPercentageOfChangeInPartnershipEquityForAllLimitedPartnerships" name="IncomeAsPercentageOfChangeInPartnershipEquityForAllLimitedPartnerships" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="cna_IncomeLossFromContinuingOperationsBeforeEquityMethodInvestments" name="IncomeLossFromContinuingOperationsBeforeEquityMethodInvestments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cna_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndIncomeLossFromSubsidiaries" name="IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndIncomeLossFromSubsidiaries" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cna_IncomeTaxExpenseBenefitOnNetRealizedInvestmentGainsLosses" name="IncomeTaxExpenseBenefitOnNetRealizedInvestmentGainsLosses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_IncomeTaxExpenseBenefitOnOperatingIncomeLoss" name="IncomeTaxExpenseBenefitOnOperatingIncomeLoss" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_Increasedecreaseinshadowadjustmentnetoftax" name="Increasedecreaseinshadowadjustmentnetoftax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_InsuranceClaimsandPolicyholdersBenefitsIncludingPolicyholdersDividendsMember" name="InsuranceClaimsandPolicyholdersBenefitsIncludingPolicyholdersDividendsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_InsuranceReservesAbstract" name="InsuranceReservesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_Insuranceclaimsandpolicyholdersbenefitsincludingpolicyholdersdividends" name="Insuranceclaimsandpolicyholdersbenefitsincludingpolicyholdersdividends" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_InternationalMember" name="InternationalMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_InvestmentInSubsidiaries" name="InvestmentInSubsidiaries" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cna_InvestmentsWithOtherThanTemporaryImpairmentsMember" name="InvestmentsWithOtherThanTemporaryImpairmentsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_InvestmentsandDerivativesRealizedGainLoss" name="InvestmentsandDerivativesRealizedGainLoss" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cna_InvestmentsandDerivativesRealizedGainLossExcludingOtherthanTemporaryImpairments" name="InvestmentsandDerivativesRealizedGainLossExcludingOtherthanTemporaryImpairments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cna_InvestmentsthatExceedTenPercentofStockholdersEquity" name="InvestmentsthatExceedTenPercentofStockholdersEquity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cna_LargestRecoverablesFromSingleReinsurer" name="LargestRecoverablesFromSingleReinsurer" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cna_LegalProceedingsCommitmentsandContingenciesandGuaranteesAbstract" name="LegalProceedingsCommitmentsandContingenciesandGuaranteesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_LegalProceedingsCommitmentsandContingenciesandGuaranteesLineItems" name="LegalProceedingsCommitmentsandContingenciesandGuaranteesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_LegalProceedingsCommitmentsandContingenciesandGuaranteesTable" name="LegalProceedingsCommitmentsandContingenciesandGuaranteesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_LegalProceedingsCommitmentsandContingenciesandGuaranteesTextBlock" name="LegalProceedingsCommitmentsandContingenciesandGuaranteesTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCtaAndOther" name="LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCtaAndOther" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cna_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAmortizationOfDiscount" name="LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAmortizationOfDiscount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_Liabilityforunpaidclaimandclaimadjustmentexpensegross" name="Liabilityforunpaidclaimandclaimadjustmentexpensegross" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cna_LifeAndGroupNonCoreMember" name="LifeAndGroupNonCoreMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_LifeandGroupMember" name="LifeandGroupMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_LimitedPartnershipEquityRelatedHedgeFundStrategyPlanAssets" name="LimitedPartnershipEquityRelatedHedgeFundStrategyPlanAssets" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="cna_LimitedPartnershipHedgeFundMultiStrategyPlanAssets" name="LimitedPartnershipHedgeFundMultiStrategyPlanAssets" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="cna_LimitedPartnershipHedgeFundStrategyDistressedInvestmentsPlanAssets" name="LimitedPartnershipHedgeFundStrategyDistressedInvestmentsPlanAssets" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="cna_LimitedPartnershipInvestments" name="LimitedPartnershipInvestments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cna_LimitedPartnershipandCommonStockInvestmentsMember" name="LimitedPartnershipandCommonStockInvestmentsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_LimitedPartnershipsInvestedInPrivateDebtAndEquity" name="LimitedPartnershipsInvestedInPrivateDebtAndEquity" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="cna_LineOfCreditFacilityAdditionalBorrowingCapacity" name="LineOfCreditFacilityAdditionalBorrowingCapacity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cna_LineOfCreditFacilityExtensionTerm" name="LineOfCreditFacilityExtensionTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_LineofCreditFacilityNumberofExtensionOptions" name="LineofCreditFacilityNumberofExtensionOptions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cna_LloydsSyndicateCapacityMember" name="LloydsSyndicateCapacityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_LoewsMember" name="LoewsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_LongtermCareClaimReservesWeightedAverageDiscountedInterestRate" name="LongtermCareClaimReservesWeightedAverageDiscountedInterestRate" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_LongtermcareInsuranceProductLineMember" name="LongtermcareInsuranceProductLineMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_ManagementandProfessionalLiabilityMember" name="ManagementandProfessionalLiabilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_MarketableSecuritiesFixedMaturitiesAtAmortizedCost" name="MarketableSecuritiesFixedMaturitiesAtAmortizedCost" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cna_MeasurementPeriodofSpecificAnnualPerformanceGoalsinYears" name="MeasurementPeriodofSpecificAnnualPerformanceGoalsinYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_MedicalProfessionalLiabilityMember" name="MedicalProfessionalLiabilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_MiddleMarketsMember" name="MiddleMarketsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_NetAEPadversedevelopmentbeforeconsiderationofLPT" name="NetAEPadversedevelopmentbeforeconsiderationofLPT" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_NetCaseReserves" name="NetCaseReserves" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cna_NetChangeInUnrealizedGainsLossesInInvestmentsTableTextBlock" name="NetChangeInUnrealizedGainsLossesInInvestmentsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_NetClaimandClaimAdjustmentExpenseReservesatAcquisition" name="NetClaimandClaimAdjustmentExpenseReservesatAcquisition" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cna_NetIbnrReserves" name="NetIbnrReserves" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cna_NetIncurredClaimandClaimAdjustmentExpenseLineItems" name="NetIncurredClaimandClaimAdjustmentExpenseLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_NetIncurredClaimandClaimAdjustmentExpenseTable" name="NetIncurredClaimandClaimAdjustmentExpenseTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_NetInvestmentIncomeAndGainsLossesOnTradingSecurities" name="NetInvestmentIncomeAndGainsLossesOnTradingSecurities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cna_NetInvestmentIncomeTableTextBlock" name="NetInvestmentIncomeTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_NetOperatingIncomeLossFromContinuingOperationsAttributabletoParent" name="NetOperatingIncomeLossFromContinuingOperationsAttributabletoParent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cna_NetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveAndPremiumDevelopmentTableTextBlock" name="NetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveAndPremiumDevelopmentTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_NetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentCommercialAuto" name="NetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentCommercialAuto" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_NetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentGeneralLiability" name="NetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentGeneralLiability" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_NetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentMedicalProfessionalLiability" name="NetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentMedicalProfessionalLiability" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_NetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentOther" name="NetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentOther" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_NetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentPropertyAndOther" name="NetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentPropertyAndOther" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_NetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentSurety" name="NetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentSurety" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_NetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentWarranty" name="NetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentWarranty" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_NetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentWorkersCompensation" name="NetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentWorkersCompensation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_NetPriorYearClaimandAllocatedClaimAdjustmentExpenseReserveDevelopment" name="NetPriorYearClaimandAllocatedClaimAdjustmentExpenseReserveDevelopment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_NetPriorYearClaimandAllocatedClaimAdjustmentExpenseReserveDevelopmentLiability" name="NetPriorYearClaimandAllocatedClaimAdjustmentExpenseReserveDevelopmentLiability" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_NetPriorYearClaimandAllocatedClaimAdjustmentExpenseReserveDevelopmentOtherProfessionalLiability" name="NetPriorYearClaimandAllocatedClaimAdjustmentExpenseReserveDevelopmentOtherProfessionalLiability" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_NetPriorYearClaimandAllocatedClaimAdjustmentExpenseReserveDevelopmentPriorYears" name="NetPriorYearClaimandAllocatedClaimAdjustmentExpenseReserveDevelopmentPriorYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_NetPriorYearClaimandAllocatedClaimAdjustmentExpenseReserveDevelopmentPropertyMarine" name="NetPriorYearClaimandAllocatedClaimAdjustmentExpenseReserveDevelopmentPropertyMarine" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_NetRealizedInvestmentGainLossesMember" name="NetRealizedInvestmentGainLossesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_NetRealizedInvestmentGainsLosses" name="NetRealizedInvestmentGainsLosses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cna_NetRealizedInvestmentGainsLossesContinuingAndDiscontinuingOperations" name="NetRealizedInvestmentGainsLossesContinuingAndDiscontinuingOperations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cna_NetprioryearclaimandallocatedclaimadjustmentexpensereservedevelopmentOtherProfessionalLiabilityandManagementLiability" name="NetprioryearclaimandallocatedclaimadjustmentexpensereservedevelopmentOtherProfessionalLiabilityandManagementLiability" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_NetprioryearclaimandallocatedclaimadjustmentexpensereservedevelopmentTableTextBlock" name="NetprioryearclaimandallocatedclaimadjustmentexpensereservedevelopmentTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_NetreinsurancereceivablestransferredtoNICOunderAEPLossPortfolioTransfer" name="NetreinsurancereceivablestransferredtoNICOunderAEPLossPortfolioTransfer" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cna_NonCoreSegmentsLifeGroupNonCoreandCorporateandOtherNonCoreMember" name="NonCoreSegmentsLifeGroupNonCoreandCorporateandOtherNonCoreMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_NonIncomeProducingFixedMaturitySecurities" name="NonIncomeProducingFixedMaturitySecurities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cna_OperatingIncomeLossFromContinuingOperationsBeforeIncomeTax" name="OperatingIncomeLossFromContinuingOperationsBeforeIncomeTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cna_OperatingLossCarryforwardsSubjecttoExpiration" name="OperatingLossCarryforwardsSubjecttoExpiration" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cna_OperatingRevenues" name="OperatingRevenues" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_OtherCommercialInsuranceMember" name="OtherCommercialInsuranceMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansSettlementsbeforeTax" name="OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansSettlementsbeforeTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cna_OtherInsuranceRelatedExpenses" name="OtherInsuranceRelatedExpenses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_OtherInvestedAssetsMember" name="OtherInvestedAssetsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_OtherInvestedAssetsOverseasDeposit" name="OtherInvestedAssetsOverseasDeposit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cna_OtherInvestmentIncomeMember" name="OtherInvestmentIncomeMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_OtherMember" name="OtherMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_OtherProfessionalLiabilityandManagementLiabilityMember" name="OtherProfessionalLiabilityandManagementLiabilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_OtherRevenuesMember" name="OtherRevenuesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_PaloVerdeInsuranceCompanyMember" name="PaloVerdeInsuranceCompanyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_PaymentsToPurchaseMortgageLoans" name="PaymentsToPurchaseMortgageLoans" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cna_PaymentstoAcquireMarketableSecuritiesEquity" name="PaymentstoAcquireMarketableSecuritiesEquity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_PercentageOfAssumedEarnedToNetEarnedPremiumsDomain" name="PercentageOfAssumedEarnedToNetEarnedPremiumsDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_PercentageOfAssumedPremiumWrittenToPremiumWrittenNet" name="PercentageOfAssumedPremiumWrittenToPremiumWrittenNet" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_PercentageOfAssumedPremiumsEarnedToNetPremiumsEarnedMember" name="PercentageOfAssumedPremiumsEarnedToNetPremiumsEarnedMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_PercentageOfAssumedPremiumsWrittenToNetPremiumsWrittenMember" name="PercentageOfAssumedPremiumsWrittenToNetPremiumsWrittenMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_PercentageOfAssumedWrittenToNetWrittenPremiumsDomain" name="PercentageOfAssumedWrittenToNetWrittenPremiumsDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_PercentageOfBilledReceivablesComparedToTotalReinsuranceReceivable" name="PercentageOfBilledReceivablesComparedToTotalReinsuranceReceivable" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_PercentageOfDistressedInvestmentsLimitedPartnershipHedgeFundStrategies" name="PercentageOfDistressedInvestmentsLimitedPartnershipHedgeFundStrategies" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="cna_PercentageOfEquityRelatedLimitedPartnershipHedgeFundStrategies" name="PercentageOfEquityRelatedLimitedPartnershipHedgeFundStrategies" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="cna_PercentageOfFixedIncomeLimitedPartnershipHedgeFundStrategies" name="PercentageOfFixedIncomeLimitedPartnershipHedgeFundStrategies" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="cna_PercentageOfLimitedPartnershipsEmployingHedgeFundStrategiesFocusedOnFixedIncomeAndEquityInvestments" name="PercentageOfLimitedPartnershipsEmployingHedgeFundStrategiesFocusedOnFixedIncomeAndEquityInvestments" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="cna_PercentageOfLimitedPartnershipsReportedOnCurrentBasis" name="PercentageOfLimitedPartnershipsReportedOnCurrentBasis" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="cna_PercentageOfLimitedPartnershipsReportedOnOneMonthLag" name="PercentageOfLimitedPartnershipsReportedOnOneMonthLag" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="cna_PercentageOfMultistrategyApproachLimitedPartnershipHedgeFundStrategies" name="PercentageOfMultistrategyApproachLimitedPartnershipHedgeFundStrategies" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cna_PercentageofassumedpremiumsearnedtonetpremiumsearnedAxis" name="PercentageofassumedpremiumsearnedtonetpremiumsearnedAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_PercentageofassumedpremiumswrittentonetpremiumswrittenAxis" name="PercentageofassumedpremiumswrittentonetpremiumswrittenAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_Percentageofforeigndirectwrittenpremiums" name="Percentageofforeigndirectwrittenpremiums" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_PerformanceBasedAdjustmentShareBasedCompensationEquityInstrumentsOtherThanOptions" name="PerformanceBasedAdjustmentShareBasedCompensationEquityInstrumentsOtherThanOptions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_PerformanceBasedAdjustmentShareBasedCompensationEquityInstrumentsOtherThanOptionsWeightedAverageGrantDateFairValue" name="PerformanceBasedAdjustmentShareBasedCompensationEquityInstrumentsOtherThanOptionsWeightedAverageGrantDateFairValue" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_PolicyholderBenefitsandClaimsIncurredAdditionalAmountCeded" name="PolicyholderBenefitsandClaimsIncurredAdditionalAmountCeded" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_PretaxFavorableUnfavorableNetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentExcludingLifeGroup" name="PretaxFavorableUnfavorableNetPriorYearClaimAndAllocatedClaimAdjustmentExpenseReserveDevelopmentExcludingLifeGroup" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_PretaxFavorableUnfavorablePremiumDevelopmentExcludingLifeGroup" name="PretaxFavorableUnfavorablePremiumDevelopmentExcludingLifeGroup" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_Pretaximpactofdeferredretroactivereinsurancebenefit" name="Pretaximpactofdeferredretroactivereinsurancebenefit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_ProceedsfromSaleofMarketableSecuritiesEquity" name="ProceedsfromSaleofMarketableSecuritiesEquity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_PropertyandOtherMember" name="PropertyandOtherMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_ProvisionForUncollectibleThirdPartyReinsurance" name="ProvisionForUncollectibleThirdPartyReinsurance" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_ProvisionForUncollectibleThirdPartyReinsuranceReleased" name="ProvisionForUncollectibleThirdPartyReinsuranceReleased" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_RealizedGainLossonShortTermInvestments" name="RealizedGainLossonShortTermInvestments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cna_ReductionOfNetUnrealizedGainsOnInvestmentsIncludedInAOCIDueToShadowAdjustments" name="ReductionOfNetUnrealizedGainsOnInvestmentsIncludedInAOCIDueToShadowAdjustments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="cna_ReinsurancePremiumPaidToNicoUnderAepLossPortfolioTransfer" name="ReinsurancePremiumPaidToNicoUnderAepLossPortfolioTransfer" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cna_ReservesBeginningOfYearAbstract" name="ReservesBeginningOfYearAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_Retroactivereinsurancebenefitrecognized" name="Retroactivereinsurancebenefitrecognized" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cna_RevenuesExcludingInvestmentsAndDerivativesRealizedGainLoss" name="RevenuesExcludingInvestmentsAndDerivativesRealizedGainLoss" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_ScheduleIiBalanceSheetParentheticalAbstract" name="ScheduleIiBalanceSheetParentheticalAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_ScheduleOfAmountsReceivableFromReinsurersTableTextBlock" name="ScheduleOfAmountsReceivableFromReinsurersTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_ScheduleOfAvailableForSaleAndTradingSecuritiesTable" name="ScheduleOfAvailableForSaleAndTradingSecuritiesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_ScheduleOfStatutoryFinancialInformationTableTextBlock" name="ScheduleOfStatutoryFinancialInformationTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_ScheduleViSupplementalInformationParentheticalAbstract" name="ScheduleViSupplementalInformationParentheticalAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_ScheduleofDefinedBenefitandContributionPlansDisclosureTable" name="ScheduleofDefinedBenefitandContributionPlansDisclosureTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_ScheduleofOtherIntangibleAssetsAbstract" name="ScheduleofOtherIntangibleAssetsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_ScheduleofOtherIntangibleAssetsTableTextBlock" name="ScheduleofOtherIntangibleAssetsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_SeniorNotes3.450faceamountof500dueAugust152027Member" name="SeniorNotes3.450faceamountof500dueAugust152027Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_SeniorNotes3.900faceamountof500dueMay12029Member" name="SeniorNotes3.900faceamountof500dueMay12029Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_SeniorNotes3.950faceamountof550dueMay152024Member" name="SeniorNotes3.950faceamountof550dueMay152024Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_SeniorNotes4.500faceamountof500dueMarch12026Member" name="SeniorNotes4.500faceamountof500dueMarch12026Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_SeniorNotes5750FaceAmount400DueAugust152021Member" name="SeniorNotes5750FaceAmount400DueAugust152021Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_SeniorNotes5875FaceAmount500DueAugust152020Member" name="SeniorNotes5875FaceAmount500DueAugust152020Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_SeniorNotes7350FaceAmount350DueNovember152019Member" name="SeniorNotes7350FaceAmount350DueNovember152019Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_ShortDurationContractsNetCumulativePaidClaimAdjustmentExpensesLineItems" name="ShortDurationContractsNetCumulativePaidClaimAdjustmentExpensesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_ShortDurationContractsNetCumulativePaidClaimAdjustmentExpensesReconciliationofTotalLiabilityforUnpaidClaimandClaimAdjustmentExpenseTableTextBlock" name="ShortDurationContractsNetCumulativePaidClaimAdjustmentExpensesReconciliationofTotalLiabilityforUnpaidClaimandClaimAdjustmentExpenseTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_ShortDurationContractsNetCumulativePaidClaimAdjustmentExpensesTable" name="ShortDurationContractsNetCumulativePaidClaimAdjustmentExpensesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_ShortDurationContractsNetIncurredClaimsandAllocatedClaimAdjustmentExpensesTableTextBlock" name="ShortDurationContractsNetIncurredClaimsandAllocatedClaimAdjustmentExpensesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_ShortDurationContractsReserveDevelopmentTableTextBlock" name="ShortDurationContractsReserveDevelopmentTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_ShortDurationInsuranceContractsHistoricalClaimsDurationNet" name="ShortDurationInsuranceContractsHistoricalClaimsDurationNet" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cna_ShortDurationInsuranceContractsNetCumulativePaidClaimandClaimAdjustmentExpensesLineItems" name="ShortDurationInsuranceContractsNetCumulativePaidClaimandClaimAdjustmentExpensesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_ShortDurationInsuranceContractsNetCumulativePaidClaimandClaimAdjustmentExpensesTable" name="ShortDurationInsuranceContractsNetCumulativePaidClaimandClaimAdjustmentExpensesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_ShorttermInvestmentsandOther" name="ShorttermInvestmentsandOther" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cna_SignificantCaptiveProgramMember" name="SignificantCaptiveProgramMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_SmallBusinessMember" name="SmallBusinessMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_SpecialtyMember" name="SpecialtyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_StatutoryAccountingPracticesDividendsPaidintheprecedingtwelvemonths" name="StatutoryAccountingPracticesDividendsPaidintheprecedingtwelvemonths" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cna_StatutoryAccountingPracticesStatutoryAmountAvailableforDividendPaymentsBeforeConsiderationofStatutoryDividendsPaidintheprecedingtwelvemonths" name="StatutoryAccountingPracticesStatutoryAmountAvailableforDividendPaymentsBeforeConsiderationofStatutoryDividendsPaidintheprecedingtwelvemonths" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cna_StockholdersEquityAndStatutoryAccountingPracticesAbstract" name="StockholdersEquityAndStatutoryAccountingPracticesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_StockholdersEquityAndStatutoryAccountingPracticesTextBlock" name="StockholdersEquityAndStatutoryAccountingPracticesTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_StructuredSettlementAnnuitiesInterestRatesHighEnd" name="StructuredSettlementAnnuitiesInterestRatesHighEnd" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_StructuredSettlementAnnuitiesInterestRatesLowEnd" name="StructuredSettlementAnnuitiesInterestRatesLowEnd" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_SubsidiariesOfBerkshireHathawayGroupMember" name="SubsidiariesOfBerkshireHathawayGroupMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_SubsidiariesofWiltonReMember" name="SubsidiariesofWiltonReMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_SuretyMember" name="SuretyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_TaxespaidMember" name="TaxespaidMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_TotalconsiderationpaidtoNICOunderAEPLossPortfolioTransfer" name="TotalconsiderationpaidtoNICOunderAEPLossPortfolioTransfer" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cna_TradingPortfolioSecuritiesMember" name="TradingPortfolioSecuritiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_UnallocatedClaimAdjustmentExpenseDevelopment" name="UnallocatedClaimAdjustmentExpenseDevelopment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_WarrantyAlternativeRisksMember" name="WarrantyAlternativeRisksMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cna_WarrantyCoverageTerm" name="WarrantyCoverageTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_WarrantyMember" name="WarrantyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_WeightedAverageNumberOfSharesOustandingBasicAndDilutedAbstract" name="WeightedAverageNumberOfSharesOustandingBasicAndDilutedAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cna_WorkersCompensationMember" name="WorkersCompensationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
</xsd:schema>
</XBRL>