$CNA
CNA FINANCIAL CORP Stock $cna

$cna Overview Financials Valuation SEC Filings Company Website

2024 Q2 Form 10-Q Financial Statement

#000002117524000039 Filed on May 06, 2024

Income Statement

Concept	2024 Q2	2024 Q1
Revenue	$3.519B	$3.444B
YoY Change	6.51%	9.26%
Cost Of Revenue	$1.874B	$1.798B
YoY Change	5.76%	9.23%
Gross Profit	$1.645B	$1.646B
YoY Change	7.38%	9.3%
Gross Profit Margin	46.75%	47.79%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$435.0M	$16.00M
YoY Change	2618.75%	33.33%
% of Gross Profit	26.44%	0.97%
Operating Expenses	$3.083B	$2.982B
YoY Change	5.87%	8.32%
Operating Profit	-$1.438B	-$1.336B
YoY Change	4.2%	7.14%
Interest Expense	$34.00M	$35.00M
YoY Change	-209.68%	25.0%
% of Operating Profit
Other Income/Expense, Net	$83.00M	$85.00M
YoY Change	40.68%	41.67%
Pretax Income	$402.0M	$427.0M
YoY Change	11.36%	15.09%
Income Tax	$85.00M	$89.00M
% Of Pretax Income	21.14%	20.84%
Net Earnings	$317.0M	$338.0M
YoY Change	12.01%	13.8%
Net Earnings / Revenue	9.01%	9.81%
Basic Earnings Per Share	$1.17	$1.24
Diluted Earnings Per Share	$1.17	$1.24
COMMON SHARES
Basic Shares Outstanding	271.3M shares	270.9M shares
Diluted Shares Outstanding	272.6M shares	272.7M shares

Balance Sheet

Concept	2024 Q2	2024 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$375.0M	$409.0M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$259.0M	$256.0M
YoY Change	5.28%	10.34%
Goodwill	$146.0M	$146.0M
YoY Change	0.0%	0.69%
Intangibles
YoY Change
Long-Term Investments	$46.25B	$46.67B
YoY Change	4.07%	6.02%
Other Assets	$941.0M	$942.0M
YoY Change	-21.65%	-18.58%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$65.19B	$65.08B
YoY Change	3.34%	4.87%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$550.0M
YoY Change		126.34%
Long-Term Debt Due	$0.00	$550.0M
YoY Change	-100.0%	126.34%
Total Short-Term Liabilities		$550.0M
YoY Change		126.34%
LONG-TERM LIABILITIES
Long-Term Debt	$2.971B	$2.970B
YoY Change	24.62%	16.98%
Other Long-Term Liabilities	$7.755B	$7.746B
YoY Change	0.19%	1.39%
Total Long-Term Liabilities	$2.971B	$2.970B
YoY Change	-70.65%	16.98%
TOTAL LIABILITIES
Total Short-Term Liabilities		$550.0M
Total Long-Term Liabilities	$2.971B	$2.970B
Total Liabilities	$55.32B	$55.41B
YoY Change	1.76%	3.79%
SHAREHOLDERS EQUITY
Retained Earnings	$9.623B	$9.425B
YoY Change	2.82%	2.55%
Common Stock	$2.893B	$2.884B
YoY Change	0.21%	0.17%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$95.00M	$75.00M
YoY Change	0.0%	-21.05%
Treasury Stock Shares
Shareholders Equity	$9.874B	$9.662B
YoY Change
Total Liabilities & Shareholders Equity	$65.19B	$65.08B
YoY Change	3.34%	4.87%

Cashflow Statement

Concept	2024 Q2	2024 Q1
OPERATING ACTIVITIES
Net Income	$317.0M	$338.0M
YoY Change	12.01%	13.8%
Depreciation, Depletion And Amortization	$435.0M	$16.00M
YoY Change	2618.75%	33.33%
Cash From Operating Activities	$616.0M	$504.0M
YoY Change	22.95%	15.6%
INVESTING ACTIVITIES
Capital Expenditures	$19.00M	$20.00M
YoY Change	-17.39%	0.0%
Acquisitions
YoY Change
Other Investing Activities	$59.00M	-$1.000M
YoY Change	-106.66%	-101.41%
Cash From Investing Activities	$40.00M	-$249.0M
YoY Change	-104.4%	-588.24%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-689.0M	-$189.0M
YoY Change	-346.07%	-60.63%
NET CHANGE
Cash From Operating Activities	616.0M	$504.0M
Cash From Investing Activities	40.00M	-$249.0M
Cash From Financing Activities	-689.0M	-$189.0M
Net Change In Cash	-33.00M	$64.00M
YoY Change	-74.22%	700.0%
FREE CASH FLOW
Cash From Operating Activities	$616.0M	$504.0M
Capital Expenditures	$19.00M	$20.00M
Free Cash Flow	$597.0M	$484.0M
YoY Change	24.9%	16.35%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2023Q1	cna	Net Investment Income And Gains Losses On Trading Securities NetInvestmentIncomeAndGainsLossesOnTradingSecurities	525000000	usd
CY2024Q1	us-gaap	Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Income Extensible List FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList	http://www.cna.com/20240331#InvestmentsandDerivativesRealizedGainLoss
CY2024Q1	us-gaap	Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Other Comprehensive Income Extensible List FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfOtherComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#OtherComprehensiveIncomeLossNetOfTax
CY2023Q1	us-gaap	Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Income Extensible List FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList	http://www.cna.com/20240331#InvestmentsandDerivativesRealizedGainLoss
CY2023Q1	us-gaap	Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Other Comprehensive Income Extensible List FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfOtherComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#OtherComprehensiveIncomeLossNetOfTax
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P9M
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
CY2024Q1	cna	Net Investment Income And Gains Losses On Trading Securities NetInvestmentIncomeAndGainsLossesOnTradingSecurities	609000000	usd
CY2024Q1	cna	Investmentsand Derivatives Realized Gain Loss InvestmentsandDerivativesRealizedGainLoss	-22000000	usd
CY2023Q1	cna	Investmentsand Derivatives Realized Gain Loss InvestmentsandDerivativesRealizedGainLoss	-35000000	usd
CY2024Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	407000000	usd
CY2023Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	407000000	usd
CY2024Q1	us-gaap	Other Income OtherIncome	9000000	usd
CY2023Q1	us-gaap	Other Income OtherIncome	7000000	usd
CY2024Q1	us-gaap	Revenues Revenues	3444000000	usd
CY2023Q1	us-gaap	Revenues Revenues	3152000000	usd
CY2024Q1	cna	Insurance Claims And Policyholders Benefits Including Policyholders Dividends Remeasurement Impact InsuranceClaimsAndPolicyholdersBenefitsIncludingPolicyholdersDividendsRemeasurementImpact	-15000000	usd
CY2023Q1	cna	Insurance Claims And Policyholders Benefits Including Policyholders Dividends Remeasurement Impact InsuranceClaimsAndPolicyholdersBenefitsIncludingPolicyholdersDividendsRemeasurementImpact	1000000	usd
CY2024Q1	cna	Insuranceclaimsandpolicyholdersbenefitsincludingpolicyholdersdividends Insuranceclaimsandpolicyholdersbenefitsincludingpolicyholdersdividends	1807000000	usd
CY2023Q1	cna	Insuranceclaimsandpolicyholdersbenefitsincludingpolicyholdersdividends Insuranceclaimsandpolicyholdersbenefitsincludingpolicyholdersdividends	1653000000	usd
CY2024Q1	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	444000000	usd
CY2023Q1	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	379000000	usd
CY2024Q1	cna	Costs From Contract With Customers CostsFromContractWithCustomers	394000000	usd
CY2023Q1	cna	Costs From Contract With Customers CostsFromContractWithCustomers	384000000	usd
CY2024Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	337000000	usd
CY2023Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	337000000	usd
CY2024Q1	us-gaap	Interest Expense InterestExpense	35000000	usd
CY2023Q1	us-gaap	Interest Expense InterestExpense	28000000	usd
CY2024Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	3017000000	usd
CY2023Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	2781000000	usd
CY2024Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	427000000	usd
CY2023Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	371000000	usd
CY2024Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	89000000	usd
CY2023Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	74000000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	338000000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	297000000	usd
CY2024Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.24
CY2023Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.10
CY2024Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.24
CY2023Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.09
CY2024Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	271600000	shares
CY2023Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	271300000	shares
CY2024Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	272700000	shares
CY2023Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	272300000	shares
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	338000000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	297000000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax	-215000000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax	662000000	usd
CY2024Q1	us-gaap	Oci Liability For Future Policy Benefit Gain Loss After Reclassification Adjustment And Tax Parent OciLiabilityForFuturePolicyBenefitGainLossAfterReclassificationAdjustmentAndTaxParent	341000000	usd
CY2023Q1	us-gaap	Oci Liability For Future Policy Benefit Gain Loss After Reclassification Adjustment And Tax Parent OciLiabilityForFuturePolicyBenefitGainLossAfterReclassificationAdjustmentAndTaxParent	-396000000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-32000000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	17000000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-6000000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-7000000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	100000000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	290000000	usd
CY2024Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	438000000	usd
CY2023Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	587000000	usd
CY2024Q1	cna	Marketable Securities Fixed Maturities At Amortized Cost MarketableSecuritiesFixedMaturitiesAtAmortizedCost	42878000000	usd
CY2023Q4	cna	Marketable Securities Fixed Maturities At Amortized Cost MarketableSecuritiesFixedMaturitiesAtAmortizedCost	42414000000	usd
CY2024Q1	cna	Marketable Securities Fixed Maturities Allowance For Credit Loss MarketableSecuritiesFixedMaturitiesAllowanceForCreditLoss	20000000	usd
CY2023Q4	cna	Marketable Securities Fixed Maturities Allowance For Credit Loss MarketableSecuritiesFixedMaturitiesAllowanceForCreditLoss	16000000	usd
CY2024Q1	us-gaap	Debt Securities DebtSecurities	40605000000	usd
CY2023Q4	us-gaap	Debt Securities DebtSecurities	40425000000	usd
CY2024Q1	us-gaap	Equity Securities Fv Ni Cost EquitySecuritiesFvNiCost	681000000	usd
CY2023Q4	us-gaap	Equity Securities Fv Ni Cost EquitySecuritiesFvNiCost	686000000	usd
CY2024Q1	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	691000000	usd
CY2023Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	683000000	usd
CY2024Q1	cna	Limited Partnership Investments LimitedPartnershipInvestments	2274000000	usd
CY2023Q4	cna	Limited Partnership Investments LimitedPartnershipInvestments	2174000000	usd
CY2024Q1	us-gaap	Other Investments OtherInvestments	79000000	usd
CY2023Q4	us-gaap	Other Investments OtherInvestments	80000000	usd
CY2024Q1	cna	Mortgage Loans On Real Estate Commercial And Consumer Allowance For Credit Loss MortgageLoansOnRealEstateCommercialAndConsumerAllowanceForCreditLoss	35000000	usd
CY2023Q4	cna	Mortgage Loans On Real Estate Commercial And Consumer Allowance For Credit Loss MortgageLoansOnRealEstateCommercialAndConsumerAllowanceForCreditLoss	35000000	usd
CY2024Q1	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	1029000000	usd
CY2023Q4	us-gaap	Mortgage Loans On Real Estate Commercial And Consumer Net MortgageLoansOnRealEstateCommercialAndConsumerNet	1035000000	usd
CY2024Q1	us-gaap	Other Short Term Investments OtherShortTermInvestments	1996000000	usd
CY2023Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	2165000000	usd
CY2024Q1	us-gaap	Investments Investments	46674000000	usd
CY2023Q4	us-gaap	Investments Investments	46562000000	usd
CY2024Q1	us-gaap	Cash Cash	409000000	usd
CY2023Q4	us-gaap	Cash Cash	345000000	usd
CY2024Q1	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	22000000	usd
CY2023Q4	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	22000000	usd
CY2024Q1	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	5574000000	usd
CY2023Q4	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	5412000000	usd
CY2024Q1	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	26000000	usd
CY2023Q4	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	28000000	usd
CY2024Q1	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	3432000000	usd
CY2023Q4	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	3442000000	usd
CY2024Q1	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	447000000	usd
CY2023Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	444000000	usd
CY2024Q1	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	927000000	usd
CY2023Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	896000000	usd
CY2024Q1	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	942000000	usd
CY2023Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	1016000000	usd
CY2024Q1	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	303000000	usd
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	296000000	usd
CY2024Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	256000000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	253000000	usd
CY2024Q1	us-gaap	Goodwill Goodwill	146000000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	146000000	usd
CY2024Q1	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	3621000000	usd
CY2023Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	3661000000	usd
CY2024Q1	us-gaap	Other Assets OtherAssets	2647000000	usd
CY2023Q4	us-gaap	Other Assets OtherAssets	2534000000	usd
CY2024Q1	us-gaap	Assets Assets	65075000000	usd
CY2023Q4	us-gaap	Assets Assets	64711000000	usd
CY2024Q1	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	23588000000	usd
CY2023Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	23304000000	usd
CY2024Q1	us-gaap	Unearned Premiums UnearnedPremiums	7046000000	usd
CY2023Q4	us-gaap	Unearned Premiums UnearnedPremiums	6933000000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefits LiabilityForFuturePolicyBenefits	13513000000	usd
CY2023Q4	us-gaap	Liability For Future Policy Benefits LiabilityForFuturePolicyBenefits	13959000000	usd
CY2024Q1	us-gaap	Short Term Borrowings ShortTermBorrowings	550000000	usd
CY2023Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	550000000	usd
CY2024Q1	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2970000000	usd
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2481000000	usd
CY2024Q1	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	4645000000	usd
CY2023Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	4694000000	usd
CY2024Q1	us-gaap	Other Liabilities OtherLiabilities	3101000000	usd
CY2023Q4	us-gaap	Other Liabilities OtherLiabilities	2897000000	usd
CY2024Q1	us-gaap	Liabilities Liabilities	55413000000	usd
CY2023Q4	us-gaap	Liabilities Liabilities	54818000000	usd
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2024Q1	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	2.50
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	2.50
CY2024Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	273040243	shares
CY2024Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	273040243	shares
CY2024Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	271279498	shares
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	270881457	shares
CY2024Q1	us-gaap	Common Stock Value CommonStockValue	683000000	usd
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	683000000	usd
CY2024Q1	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2201000000	usd
CY2023Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2221000000	usd
CY2024Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	9425000000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	9755000000	usd
CY2024Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2572000000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2672000000	usd
CY2024Q1	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	1760745	shares
CY2023Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	2158786	shares
CY2024Q1	us-gaap	Treasury Stock Value TreasuryStockValue	75000000	usd
CY2023Q4	us-gaap	Treasury Stock Value TreasuryStockValue	94000000	usd
CY2024Q1	us-gaap	Stockholders Equity StockholdersEquity	9662000000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	9893000000	usd
CY2024Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	65075000000	usd
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	64711000000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	338000000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	297000000	usd
CY2024Q1	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	39000000	usd
CY2023Q1	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	21000000	usd
CY2024Q1	us-gaap	Increase Decrease In Financial Instruments Used In Operating Activities IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities	0	usd
CY2023Q1	us-gaap	Increase Decrease In Financial Instruments Used In Operating Activities IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities	13000000	usd
CY2024Q1	cna	Net Realized Investment Gains Losses Continuing And Discontinuing Operations NetRealizedInvestmentGainsLossesContinuingAndDiscontinuingOperations	-22000000	usd
CY2023Q1	cna	Net Realized Investment Gains Losses Continuing And Discontinuing Operations NetRealizedInvestmentGainsLossesContinuingAndDiscontinuingOperations	-35000000	usd
CY2024Q1	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	25000000	usd
CY2023Q1	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-6000000	usd
CY2024Q1	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	57000000	usd
CY2023Q1	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	46000000	usd
CY2024Q1	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	16000000	usd
CY2023Q1	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	12000000	usd
CY2024Q1	us-gaap	Increase Decrease In Other Receivables IncreaseDecreaseInOtherReceivables	162000000	usd
CY2023Q1	us-gaap	Increase Decrease In Other Receivables IncreaseDecreaseInOtherReceivables	24000000	usd
CY2024Q1	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	4000000	usd
CY2023Q1	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	13000000	usd
CY2024Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	409000000	usd
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	483000000	usd
CY2024Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.44
CY2023Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.62
CY2024Q1	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	34000000	usd
CY2023Q1	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	45000000	usd
CY2024Q1	us-gaap	Increase Decrease In Insurance Liabilities IncreaseDecreaseInInsuranceLiabilities	443000000	usd
CY2023Q1	us-gaap	Increase Decrease In Insurance Liabilities IncreaseDecreaseInInsuranceLiabilities	432000000	usd
CY2024Q1	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-72000000	usd
CY2023Q1	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-226000000	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	504000000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	436000000	usd
CY2024Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	736000000	usd
CY2023Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	1414000000	usd
CY2024Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	507000000	usd
CY2023Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	317000000	usd
CY2024Q1	us-gaap	Proceeds From Sale Of Equity Securities Fv Ni ProceedsFromSaleOfEquitySecuritiesFvNi	186000000	usd
CY2023Q1	us-gaap	Proceeds From Sale Of Equity Securities Fv Ni ProceedsFromSaleOfEquitySecuritiesFvNi	62000000	usd
CY2024Q1	us-gaap	Proceeds From Limited Partnership Investments ProceedsFromLimitedPartnershipInvestments	12000000	usd
CY2023Q1	us-gaap	Proceeds From Limited Partnership Investments ProceedsFromLimitedPartnershipInvestments	28000000	usd
CY2024Q1	us-gaap	Proceeds From Sale And Collection Of Mortgage Notes Receivable ProceedsFromSaleAndCollectionOfMortgageNotesReceivable	18000000	usd
CY2023Q1	us-gaap	Proceeds From Sale And Collection Of Mortgage Notes Receivable ProceedsFromSaleAndCollectionOfMortgageNotesReceivable	39000000	usd
CY2024Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1621000000	usd
CY2023Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	2258000000	usd
CY2024Q1	us-gaap	Payments To Acquire Equity Securities Fv Ni PaymentsToAcquireEquitySecuritiesFvNi	169000000	usd
CY2023Q1	us-gaap	Payments To Acquire Equity Securities Fv Ni PaymentsToAcquireEquitySecuritiesFvNi	82000000	usd
CY2024Q1	us-gaap	Payments To Acquire Limited Partnership Interests PaymentsToAcquireLimitedPartnershipInterests	77000000	usd
CY2023Q1	us-gaap	Payments To Acquire Limited Partnership Interests PaymentsToAcquireLimitedPartnershipInterests	116000000	usd
CY2024Q1	us-gaap	Payments To Acquire Mortgage Notes Receivable PaymentsToAcquireMortgageNotesReceivable	12000000	usd
CY2023Q1	us-gaap	Payments To Acquire Mortgage Notes Receivable PaymentsToAcquireMortgageNotesReceivable	12000000	usd
CY2024Q1	cna	Change In Other Investments ChangeInOtherInvestments	-2000000	usd
CY2023Q1	cna	Change In Other Investments ChangeInOtherInvestments	-2000000	usd
CY2024Q1	cna	Change In Short Term Investments ChangeInShortTermInvestments	192000000	usd
CY2023Q1	cna	Change In Short Term Investments ChangeInShortTermInvestments	681000000	usd
CY2024Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	20000000	usd
CY2023Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	20000000	usd
CY2024Q1	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1000000	usd
CY2023Q1	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-249000000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	51000000	usd
CY2024Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	667000000	usd
CY2023Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	445000000	usd
CY2024Q1	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	490000000	usd
CY2023Q1	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	usd
CY2024Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	usd
CY2023Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	24000000	usd
CY2024Q1	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-12000000	usd
CY2023Q1	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-11000000	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-189000000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-480000000	usd
CY2024Q1	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-2000000	usd
CY2023Q1	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1000000	usd
CY2024Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	64000000	usd
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	8000000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	345000000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	475000000	usd
CY2024Q1	us-gaap	Stockholders Equity StockholdersEquity	9662000000	usd
CY2023Q1	us-gaap	Stockholders Equity StockholdersEquity	8667000000	usd
CY2024Q1	us-gaap	Use Of Estimates UseOfEstimates	The preparation of Condensed Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the Condensed Consolidated Financial Statements and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from those estimates.The interim financial data as of March 31, 2024 and for the three months ended March 31, 2024 and 2023 is unaudited. However, in the opinion of management, the interim data includes all adjustments, including normal recurring adjustments, necessary for a fair statement of the Company's results for the interim periods in accordance with GAAP. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the full year.
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	338000000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	297000000	usd
CY2024Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	271600000	shares
CY2023Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	271300000	shares
CY2024Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	271600000	shares
CY2023Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	271300000	shares
CY2024Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1100000	shares
CY2023Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1000000.0	shares
CY2024Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	272700000	shares
CY2023Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	272300000	shares
CY2024Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.24
CY2023Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.10
CY2024Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.24
CY2023Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.09
CY2024Q1	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	0	shares
CY2023Q1	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	550000	shares
CY2023Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	24000000	usd
CY2024Q1	us-gaap	Gross Investment Income Operating GrossInvestmentIncomeOperating	630000000	usd
CY2023Q1	us-gaap	Gross Investment Income Operating GrossInvestmentIncomeOperating	544000000	usd
CY2024Q1	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	21000000	usd
CY2023Q1	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	19000000	usd
CY2024Q1	us-gaap	Net Investment Income NetInvestmentIncome	609000000	usd
CY2023Q1	us-gaap	Net Investment Income NetInvestmentIncome	525000000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	14000000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	35000000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	46000000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	57000000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-32000000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-22000000	usd
CY2024Q1	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	11000000	usd
CY2023Q1	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	-14000000	usd
CY2024Q1	cna	Realized Gain Losson Short Term Investments RealizedGainLossonShortTermInvestments	-1000000	usd
CY2023Q1	cna	Realized Gain Losson Short Term Investments RealizedGainLossonShortTermInvestments	1000000	usd
CY2024Q1	cna	Investmentsand Derivatives Realized Gain Loss InvestmentsandDerivativesRealizedGainLoss	-22000000	usd
CY2023Q1	cna	Investmentsand Derivatives Realized Gain Loss InvestmentsandDerivativesRealizedGainLoss	-35000000	usd
CY2024Q1	us-gaap	Other Than Temporary Impairment Loss Debt Securities Portion Recognized In Earnings OtherThanTemporaryImpairmentLossDebtSecuritiesPortionRecognizedInEarnings	14000000	usd
CY2023Q1	us-gaap	Other Than Temporary Impairment Loss Debt Securities Portion Recognized In Earnings OtherThanTemporaryImpairmentLossDebtSecuritiesPortionRecognizedInEarnings	8000000	usd
CY2023Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	0	usd
CY2024Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	0	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	42878000000	usd
CY2024Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	843000000	usd
CY2024Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	3096000000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	20000000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	40605000000	usd
CY2024Q1	us-gaap	Trading Securities Debt Amortized Cost TradingSecuritiesDebtAmortizedCost	0	usd
CY2024Q1	us-gaap	Trading Securities Debt TradingSecuritiesDebt	0	usd
CY2024Q1	cna	Debt Securities Amortized Cost DebtSecuritiesAmortizedCost	42878000000	usd
CY2024Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	843000000	usd
CY2024Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	3096000000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	20000000	usd
CY2024Q1	us-gaap	Debt Securities DebtSecurities	40605000000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	42414000000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	1022000000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	2995000000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	16000000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	40425000000	usd
CY2023Q4	us-gaap	Trading Securities Debt Amortized Cost TradingSecuritiesDebtAmortizedCost	0	usd
CY2023Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	0	usd
CY2023Q4	cna	Debt Securities Amortized Cost DebtSecuritiesAmortizedCost	42414000000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	1022000000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	2995000000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	16000000	usd
CY2023Q4	us-gaap	Debt Securities DebtSecurities	40425000000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	4653000000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	87000000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	22359000000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	3009000000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	27012000000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	3096000000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	3483000000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	74000000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	22248000000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	2921000000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	25731000000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	2995000000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	27012000000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	3096000000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	25731000000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	2995000000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	16000000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not Previously Recorded DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded	0	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Purchased With Credit Deterioration Increase DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease	0	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Securities Sold DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold	0	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Sell Before Recovery DebtSecuritiesAvailableForSaleAllowanceForCreditLossSellBeforeRecovery	1000000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Writeoff DebtSecuritiesAvailableForSaleAllowanceForCreditLossWriteoff	0	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Recovery DebtSecuritiesAvailableForSaleAllowanceForCreditLossRecovery	0	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not To Sell Before Recovery Credit Loss Previously Recorded Expense Reversal DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal	5000000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	20000000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	1000000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not Previously Recorded DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded	0	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Purchased With Credit Deterioration Increase DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease	9000000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Securities Sold DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold	6000000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Sell Before Recovery DebtSecuritiesAvailableForSaleAllowanceForCreditLossSellBeforeRecovery	3000000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Writeoff DebtSecuritiesAvailableForSaleAllowanceForCreditLossWriteoff	0	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Recovery DebtSecuritiesAvailableForSaleAllowanceForCreditLossRecovery	0	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not To Sell Before Recovery Credit Loss Previously Recorded Expense Reversal DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal	1000000	usd
CY2023Q1	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	2000000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	1238000000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	1207000000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	1121000000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	1091000000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	11680000000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	11308000000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	11563000000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	11180000000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	13283000000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	12461000000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	13359000000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	12573000000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	16677000000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	15629000000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	16371000000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	15581000000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	42878000000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	40605000000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	42414000000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	40425000000	usd
CY2024Q1	cna	Commitments To Purchase Or Fund Additional Amounts CommitmentsToPurchaseOrFundAdditionalAmounts	1570000000	usd
CY2024Q1	cna	Commitments To Sell Various Privately Placed Debt Securities CommitmentsToSellVariousPrivatelyPlacedDebtSecurities	25000000	usd
CY2024Q1	us-gaap	Debt Securities DebtSecurities	40605000000	usd
CY2024Q1	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	691000000	usd
CY2024Q1	cna	Shortterm Investmentsand Other ShorttermInvestmentsandOther	1820000000	usd
CY2024Q1	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	43116000000	usd
CY2024Q1	us-gaap	Other Liabilities Fair Value Disclosure OtherLiabilitiesFairValueDisclosure	0	usd
CY2024Q1	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	0	usd
CY2023Q4	us-gaap	Debt Securities DebtSecurities	40425000000	usd
CY2023Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	683000000	usd
CY2023Q4	cna	Shortterm Investmentsand Other ShorttermInvestmentsandOther	2008000000	usd
CY2023Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	43116000000	usd
CY2023Q4	us-gaap	Other Liabilities Fair Value Disclosure OtherLiabilitiesFairValueDisclosure	1000000	usd
CY2023Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	1000000	usd
CY2023Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	2014000000	usd
CY2024Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-4000000	usd
CY2024Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	-18000000	usd
CY2024Q1	cna	Fair Value Measurementwith Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings And Other Comprehensive Income Loss FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsAndOtherComprehensiveIncomeLoss	-10000000	usd
CY2024Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	92000000	usd
CY2024Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	28000000	usd
CY2024Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	53000000	usd
CY2024Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3	11000000	usd
CY2024Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	19000000	usd
CY2024Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	2007000000	usd
CY2024Q1	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	1000000	usd
CY2024Q1	cna	Fair Value Measurementwith Unobservable Inputs Reconciliation Recurring Basis Asset Unrealized Gain Loss Includedin Other Comprehensive Income Loss FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetUnrealizedGainLossIncludedinOtherComprehensiveIncomeLoss	-20000000	usd
CY2022Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	1676000000	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	0	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	32000000	usd
CY2023Q1	cna	Fair Value Measurementwith Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings And Other Comprehensive Income Loss FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsAndOtherComprehensiveIncomeLoss	31000000	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	136000000	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	0	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	12000000	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3	23000000	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	10000000	usd
CY2023Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	1844000000	usd
CY2023Q1	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	-6000000	usd
CY2023Q1	cna	Fair Value Measurementwith Unobservable Inputs Reconciliation Recurring Basis Asset Unrealized Gain Loss Includedin Other Comprehensive Income Loss FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetUnrealizedGainLossIncludedinOtherComprehensiveIncomeLoss	32000000	usd
CY2024Q1	cna	Other Invested Assets Overseas Deposit OtherInvestedAssetsOverseasDeposit	73000000	usd
CY2023Q4	cna	Other Invested Assets Overseas Deposit OtherInvestedAssetsOverseasDeposit	75000000	usd
CY2024Q1	us-gaap	Unusual Or Infrequent Item Net Of Insurance Proceeds UnusualOrInfrequentItemNetOfInsuranceProceeds	88000000	usd
CY2023Q1	us-gaap	Unusual Or Infrequent Item Net Of Insurance Proceeds UnusualOrInfrequentItemNetOfInsuranceProceeds	52000000	usd
CY2024Q1	us-gaap	Schedule Of Liability For Unpaid Claims And Claims Adjustment Expense ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense	<div style="margin-bottom:3pt;margin-top:6pt;text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The following table presents a reconciliation between beginning and ending claim and claim adjustment expense reserves.</span></div><div style="margin-bottom:3pt;margin-top:6pt;text-align:justify"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"></td><td style="width:71.066%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:12.233%"></td><td style="width:0.1%"></td><td style="width:0.1%"></td><td style="width:0.966%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:12.235%"></td><td style="width:0.1%"></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">Three months ended March 31</span></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">(In millions)</span></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">2024</span></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">2023</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Reserves, beginning of year:</span></td><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000;padding:0 1pt"></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 7.75pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Gross</span></td><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">23,304 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"></td><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">22,120 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 7.75pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Ceded</span></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">5,141 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">5,191 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Net reserves, beginning of year</span></td><td colspan="2" style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">18,163 </span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"></td><td colspan="2" style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">16,929 </span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td><td colspan="3" style="display:none"></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Net incurred claim and claim adjustment expenses:</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 7.75pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Provision for insured events of current year</span></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">1,502 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">1,326 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 7.75pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Increase (decrease) in provision for insured events of prior years</span></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">(6)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">13 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 7.75pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Amortization of discount</span></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">10 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">11 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Total net incurred </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:5.2pt;font-weight:400;line-height:100%;position:relative;top:-2.8pt;vertical-align:baseline">(1)</span></div></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">1,506 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">1,350 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Net payments attributable to:</span></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 7.75pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Current year events</span></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">(113)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">(72)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 7.75pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Prior year events</span></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">(1,168)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">(1,042)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Total net payments</span></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">(1,281)</span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">(1,114)</span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Foreign currency translation adjustment and other</span></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">(41)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">35 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Net reserves, end of period</span></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">18,347 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">17,200 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">Ceded reserves, end of period</span></td><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">5,241</span></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">5,209 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:700;line-height:100%">Gross reserves, end of period</span></td><td style="background-color:#cceeff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">23,588 </span></td><td style="background-color:#cceeff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"></td><td style="background-color:#cceeff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:100%">22,409 </span></td><td style="background-color:#cceeff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"></td></tr></table></div><div style="margin-bottom:6pt;margin-top:6pt;padding-left:13.5pt;text-align:justify;text-indent:-13.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:120%">(1) Total net incurred does not agree to Insurance claims and policyholders' benefits as reflected on the Condensed Consolidated Statements of Operations due to amounts related to retroactive reinsurance deferred gain accounting, uncollectible reinsurance, benefit expenses related to future policy benefits and policyholders' dividends, which are not reflected in the table above.</span></div>
CY2023Q4	cna	Liability For Unpaid Claim And Claim Adjustment Expense Gross LiabilityForUnpaidClaimAndClaimAdjustmentExpenseGross	23304000000	usd
CY2022Q4	cna	Liability For Unpaid Claim And Claim Adjustment Expense Gross LiabilityForUnpaidClaimAndClaimAdjustmentExpenseGross	22120000000	usd
CY2023Q4	cna	Ceded Claim And Claim Adjustment Expenses CededClaimAndClaimAdjustmentExpenses	5141000000	usd
CY2022Q4	cna	Ceded Claim And Claim Adjustment Expenses CededClaimAndClaimAdjustmentExpenses	5191000000	usd
CY2023Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	18163000000	usd
CY2022Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	16929000000	usd
CY2024Q1	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	1502000000	usd
CY2024Q1	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	1502000000	usd
CY2023Q1	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	1326000000	usd
CY2024Q1	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-6000000	usd
CY2023Q1	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	13000000	usd
CY2024Q1	cna	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Amortization Of Discount LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAmortizationOfDiscount	10000000	usd
CY2023Q1	cna	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Amortization Of Discount LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAmortizationOfDiscount	11000000	usd
CY2024Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	1506000000	usd
CY2023Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	1350000000	usd
CY2024Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	113000000	usd
CY2024Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	113000000	usd
CY2023Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	72000000	usd
CY2024Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	1168000000	usd
CY2024Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	1168000000	usd
CY2023Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	1042000000	usd
CY2024Q1	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	1281000000	usd
CY2023Q1	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	1114000000	usd
CY2024Q1	cna	Liability For Unpaid Claims And Claims Adjustment Expense Foreign Cta And Other LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCTAAndOther	-41000000	usd
CY2023Q1	cna	Liability For Unpaid Claims And Claims Adjustment Expense Foreign Cta And Other LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCTAAndOther	35000000	usd
CY2024Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	18347000000	usd
CY2023Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	17200000000	usd
CY2024Q1	cna	Ceded Claim And Claim Adjustment Expenses CededClaimAndClaimAdjustmentExpenses	5241000000	usd
CY2023Q1	cna	Ceded Claim And Claim Adjustment Expenses CededClaimAndClaimAdjustmentExpenses	5209000000	usd
CY2024Q1	cna	Liability For Unpaid Claim And Claim Adjustment Expense Gross LiabilityForUnpaidClaimAndClaimAdjustmentExpenseGross	23588000000	usd
CY2023Q1	cna	Liability For Unpaid Claim And Claim Adjustment Expense Gross LiabilityForUnpaidClaimAndClaimAdjustmentExpenseGross	22409000000	usd
CY2024Q1	cna	Pretax Favorable Unfavorable Premium Development Excluding Life Group PretaxFavorableUnfavorablePremiumDevelopmentExcludingLifeGroup	-7000000	usd
CY2023Q1	cna	Pretax Favorable Unfavorable Premium Development Excluding Life Group PretaxFavorableUnfavorablePremiumDevelopmentExcludingLifeGroup	13000000	usd
CY2024Q1	cna	Retroactive Reinsurance Benefit Recognized RetroactiveReinsuranceBenefitRecognized	12000000	usd
CY2023Q1	cna	Retroactive Reinsurance Benefit Recognized RetroactiveReinsuranceBenefitRecognized	8000000	usd
CY2023Q4	cna	Cumulative Amounts Ceded Under Aep Loss Portfolio Transfer CumulativeAmountsCededUnderAEPLossPortfolioTransfer	3600000000	usd
CY2024Q1	cna	Cumulative Amounts Ceded Under Aep Loss Portfolio Transfer CumulativeAmountsCededUnderAEPLossPortfolioTransfer	3600000000	usd
CY2023Q4	us-gaap	Liability For Future Policy Benefit Expected Net Premium Before Reinsurance After Discount Rate Change LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange	3710000000	usd
CY2022Q4	us-gaap	Liability For Future Policy Benefit Expected Net Premium Before Reinsurance After Discount Rate Change LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange	3993000000	usd
CY2023Q4	us-gaap	Aoci Liability For Future Policy Benefit Expected Net Premium Before Tax AociLiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeTax	125000000	usd
CY2022Q4	us-gaap	Aoci Liability For Future Policy Benefit Expected Net Premium Before Tax AociLiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeTax	74000000	usd
CY2023Q4	us-gaap	Liability For Future Policy Benefit Expected Net Premium Original Discount Rate Before Cash Flow And Reinsurance LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance	3585000000	usd
CY2022Q4	us-gaap	Liability For Future Policy Benefit Expected Net Premium Original Discount Rate Before Cash Flow And Reinsurance LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance	3919000000	usd
CY2023Q4	us-gaap	Liability For Future Policy Benefit Expected Net Premium Cumulative Increase Decrease From Cash Flow Change LiabilityForFuturePolicyBenefitExpectedNetPremiumCumulativeIncreaseDecreaseFromCashFlowChange	0	usd
CY2022Q4	us-gaap	Liability For Future Policy Benefit Expected Net Premium Cumulative Increase Decrease From Cash Flow Change LiabilityForFuturePolicyBenefitExpectedNetPremiumCumulativeIncreaseDecreaseFromCashFlowChange	0	usd
CY2023Q4	us-gaap	Liability For Future Policy Benefit Expected Net Premium Cumulative Increase Decrease Of Actual Variance From Expected Experience LiabilityForFuturePolicyBenefitExpectedNetPremiumCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience	-28000000	usd
CY2022Q4	us-gaap	Liability For Future Policy Benefit Expected Net Premium Cumulative Increase Decrease Of Actual Variance From Expected Experience LiabilityForFuturePolicyBenefitExpectedNetPremiumCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience	-49000000	usd
CY2023Q4	us-gaap	Liability For Future Policy Benefit Expected Net Premium Original Discount Rate Before Reinsurance After Cash Flow Change LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange	3557000000	usd
CY2022Q4	us-gaap	Liability For Future Policy Benefit Expected Net Premium Original Discount Rate Before Reinsurance After Cash Flow Change LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange	3870000000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefit Expected Net Premium Interest Income LiabilityForFuturePolicyBenefitExpectedNetPremiumInterestIncome	47000000	usd
CY2023Q1	us-gaap	Liability For Future Policy Benefit Expected Net Premium Interest Income LiabilityForFuturePolicyBenefitExpectedNetPremiumInterestIncome	52000000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefit Expected Net Premium Net Premium Collected LiabilityForFuturePolicyBenefitExpectedNetPremiumNetPremiumCollected	107000000	usd
CY2023Q1	us-gaap	Liability For Future Policy Benefit Expected Net Premium Net Premium Collected LiabilityForFuturePolicyBenefitExpectedNetPremiumNetPremiumCollected	111000000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefit Expected Net Premium Original Discount Rate Before Cash Flow And Reinsurance LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance	3497000000	usd
CY2023Q1	us-gaap	Liability For Future Policy Benefit Expected Net Premium Original Discount Rate Before Cash Flow And Reinsurance LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance	3811000000	usd
CY2024Q1	us-gaap	Aoci Liability For Future Policy Benefit Expected Net Premium Before Tax AociLiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeTax	56000000	usd
CY2023Q1	us-gaap	Aoci Liability For Future Policy Benefit Expected Net Premium Before Tax AociLiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeTax	154000000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefit Expected Net Premium Before Reinsurance After Discount Rate Change LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange	3553000000	usd
CY2023Q1	us-gaap	Liability For Future Policy Benefit Expected Net Premium Before Reinsurance After Discount Rate Change LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange	3965000000	usd
CY2023Q4	us-gaap	Liability For Future Policy Benefit Expected Future Policy Benefit Before Reinsurance After Discount Rate Change LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange	17669000000	usd
CY2022Q4	us-gaap	Liability For Future Policy Benefit Expected Future Policy Benefit Before Reinsurance After Discount Rate Change LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange	17472000000	usd
CY2023Q4	us-gaap	Aoci Liability For Future Policy Benefit Expected Future Policy Benefit Before Tax AociLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax	-578000000	usd
CY2022Q4	us-gaap	Aoci Liability For Future Policy Benefit Expected Future Policy Benefit Before Tax AociLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax	-125000000	usd
CY2023Q4	us-gaap	Liability For Future Policy Benefit Expected Future Policy Benefit Original Discount Rate Before Cash Flow And Reinsurance LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance	17091000000	usd
CY2022Q4	us-gaap	Liability For Future Policy Benefit Expected Future Policy Benefit Original Discount Rate Before Cash Flow And Reinsurance LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance	17347000000	usd
CY2023Q4	us-gaap	Liability For Future Policy Benefit Expected Future Policy Benefit Cumulative Increase Decrease From Cash Flow Change LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseFromCashFlowChange	0	usd
CY2022Q4	us-gaap	Liability For Future Policy Benefit Expected Future Policy Benefit Cumulative Increase Decrease From Cash Flow Change LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseFromCashFlowChange	0	usd
CY2023Q4	us-gaap	Liability For Future Policy Benefit Expected Future Policy Benefit Cumulative Increase Decrease Of Actual Variance From Expected Experience LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience	-13000000	usd
CY2022Q4	us-gaap	Liability For Future Policy Benefit Expected Future Policy Benefit Cumulative Increase Decrease Of Actual Variance From Expected Experience LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience	-50000000	usd
CY2023Q4	us-gaap	Liability For Future Policy Benefit Expected Future Benefit Original Discount Rate Before Reinsurance After Cash Flow Change LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange	17078000000	usd
CY2022Q4	us-gaap	Liability For Future Policy Benefit Expected Future Benefit Original Discount Rate Before Reinsurance After Cash Flow Change LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange	17297000000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefit Expected Future Policy Benefit Interest Expense LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense	231000000	usd
CY2023Q1	us-gaap	Liability For Future Policy Benefit Expected Future Policy Benefit Interest Expense LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense	242000000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefits Payment For Benefits LiabilityForFuturePolicyBenefitsPaymentForBenefits	321000000	usd
CY2023Q1	us-gaap	Liability For Future Policy Benefits Payment For Benefits LiabilityForFuturePolicyBenefitsPaymentForBenefits	302000000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefit Expected Future Policy Benefit Original Discount Rate Before Cash Flow And Reinsurance LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance	16988000000	usd
CY2023Q1	us-gaap	Liability For Future Policy Benefit Expected Future Policy Benefit Original Discount Rate Before Cash Flow And Reinsurance LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance	17237000000	usd
CY2024Q1	us-gaap	Aoci Liability For Future Policy Benefit Expected Future Policy Benefit Before Tax AociLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax	-78000000	usd
CY2023Q1	us-gaap	Aoci Liability For Future Policy Benefit Expected Future Policy Benefit Before Tax AociLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax	-704000000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefit Expected Future Policy Benefit Before Reinsurance After Discount Rate Change LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange	17066000000	usd
CY2023Q1	us-gaap	Liability For Future Policy Benefit Expected Future Policy Benefit Before Reinsurance After Discount Rate Change LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange	17941000000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefits LiabilityForFuturePolicyBenefits	13513000000	usd
CY2023Q1	us-gaap	Liability For Future Policy Benefits LiabilityForFuturePolicyBenefits	13976000000	usd
CY2024Q1	cna	Insurance Claims And Policyholders Benefits Including Policyholders Dividends Remeasurement Impact InsuranceClaimsAndPolicyholdersBenefitsIncludingPolicyholdersDividendsRemeasurementImpact	-15000000	usd
CY2023Q1	cna	Insurance Claims And Policyholders Benefits Including Policyholders Dividends Remeasurement Impact InsuranceClaimsAndPolicyholdersBenefitsIncludingPolicyholdersDividendsRemeasurementImpact	1000000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefit Gross Premium Income LiabilityForFuturePolicyBenefitGrossPremiumIncome	110000000	usd
CY2023Q1	us-gaap	Liability For Future Policy Benefit Gross Premium Income LiabilityForFuturePolicyBenefitGrossPremiumIncome	115000000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefit Interest Expense LiabilityForFuturePolicyBenefitInterestExpense	184000000	usd
CY2024Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	338000000	usd
CY2023Q1	us-gaap	Liability For Future Policy Benefit Interest Expense LiabilityForFuturePolicyBenefitInterestExpense	190000000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefit Expected Future Policy Benefit Undiscounted Before Reinsurance LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedBeforeReinsurance	32474000000	usd
CY2023Q1	us-gaap	Liability For Future Policy Benefit Expected Future Policy Benefit Undiscounted Before Reinsurance LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedBeforeReinsurance	33759000000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefit Expected Future Gross Premium Undiscounted Before Reinsurance LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumUndiscountedBeforeReinsurance	5270000000	usd
CY2023Q1	us-gaap	Liability For Future Policy Benefit Expected Future Gross Premium Undiscounted Before Reinsurance LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumUndiscountedBeforeReinsurance	5729000000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefit Expected Future Gross Premium Discounted Before Reinsurance LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumDiscountedBeforeReinsurance	3664000000	usd
CY2023Q1	us-gaap	Liability For Future Policy Benefit Expected Future Gross Premium Discounted Before Reinsurance LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumDiscountedBeforeReinsurance	4046000000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefit Weighted Average Duration LiabilityForFuturePolicyBenefitWeightedAverageDuration	P11Y
CY2023Q1	us-gaap	Liability For Future Policy Benefit Weighted Average Duration LiabilityForFuturePolicyBenefitWeightedAverageDuration	P12Y
CY2024Q1	us-gaap	Liability For Future Policy Benefit Weighted Average Interest Accretion Rate LiabilityForFuturePolicyBenefitWeightedAverageInterestAccretionRate	0.0522
CY2023Q1	us-gaap	Liability For Future Policy Benefit Weighted Average Interest Accretion Rate LiabilityForFuturePolicyBenefitWeightedAverageInterestAccretionRate	0.0526
CY2023Q4	us-gaap	Liability For Future Policy Benefit Weighted Average Interest Accretion Rate LiabilityForFuturePolicyBenefitWeightedAverageInterestAccretionRate	0.0522
CY2024Q1	us-gaap	Liability For Future Policy Benefit Current Weighted Average Discount Rate LiabilityForFuturePolicyBenefitCurrentWeightedAverageDiscountRate	0.0520
CY2023Q1	us-gaap	Liability For Future Policy Benefit Current Weighted Average Discount Rate LiabilityForFuturePolicyBenefitCurrentWeightedAverageDiscountRate	0.0492
CY2023Q4	us-gaap	Liability For Future Policy Benefit Current Weighted Average Discount Rate LiabilityForFuturePolicyBenefitCurrentWeightedAverageDiscountRate	0.0494
CY2024Q1	cna	Liability For Future Policy Benefit Losses Recognized In Current Period Reversed Due To Favorable Development LiabilityForFuturePolicyBenefitLossesRecognizedInCurrentPeriodReversedDueToFavorableDevelopment	20000000	usd
CY2023Q1	cna	Liability For Future Policy Benefit Losses Recognized In Current Period Reversed Due To Favorable Development LiabilityForFuturePolicyBenefitLossesRecognizedInCurrentPeriodReversedDueToFavorableDevelopment	13000000	usd
CY2024Q1	cna	Liability For Future Policy Benefit Losses Recognized In Prior Period Reversed Due To Favorable Development LiabilityForFuturePolicyBenefitLossesRecognizedInPriorPeriodReversedDueToFavorableDevelopment	2000000	usd
CY2023Q1	cna	Liability For Future Policy Benefit Losses Recognized In Prior Period Reversed Due To Favorable Development LiabilityForFuturePolicyBenefitLossesRecognizedInPriorPeriodReversedDueToFavorableDevelopment	11000000	usd
CY2024Q1	us-gaap	Reinsurance Recoverables Gross ReinsuranceRecoverablesGross	5596000000	usd
CY2024Q1	us-gaap	Premiums Receivable Gross PremiumsReceivableGross	3458000000	usd
CY2024Q1	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	927000000	usd
CY2024Q1	us-gaap	Goodwill Goodwill	146000000	usd
CY2024Q1	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	3621000000	usd
CY2024Q1	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	23588000000	usd
CY2024Q1	us-gaap	Unearned Premiums UnearnedPremiums	7046000000	usd
CY2024Q1	us-gaap	Liability For Future Policy Benefits LiabilityForFuturePolicyBenefits	13513000000	usd
CY2024Q1	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	4645000000	usd
CY2023Q1	us-gaap	Premiums Earned Net PremiumsEarnedNet	2248000000	usd
CY2023Q1	cna	Net Investment Income And Gains Losses On Trading Securities NetInvestmentIncomeAndGainsLossesOnTradingSecurities	525000000	usd
CY2024Q1	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	69000000	usd
CY2024Q1	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	-8000000	usd
CY2024Q1	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-31000000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	35000000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	100000000	usd
CY2022	us-gaap	Income Tax Effects Allocated Directly To Equity Cumulative Effect Of Change In Accounting Principle IncomeTaxEffectsAllocatedDirectlyToEquityCumulativeEffectOfChangeInAccountingPrinciple	-11000000	usd
CY2023Q1	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	265000000	usd
CY2023Q1	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	-6000000	usd
CY2023Q1	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-25000000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	75000000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	290000000	usd
CY2024Q1	us-gaap	Premiums Earned Net PremiumsEarnedNet	2441000000	usd
CY2024Q1	cna	Net Investment Income And Gains Losses On Trading Securities NetInvestmentIncomeAndGainsLossesOnTradingSecurities	609000000	usd
CY2024Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	407000000	usd
CY2024Q1	us-gaap	Other Income OtherIncome	9000000	usd
CY2024Q1	cna	Operating Revenues OperatingRevenues	3466000000	usd
CY2024Q1	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1798000000	usd
CY2024Q1	us-gaap	Policyholder Dividends PolicyholderDividends	9000000	usd
CY2024Q1	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	444000000	usd
CY2024Q1	cna	Costs From Contract With Customers CostsFromContractWithCustomers	394000000	usd
CY2024Q1	cna	Other Insurance Related Expenses OtherInsuranceRelatedExpenses	287000000	usd
CY2024Q1	us-gaap	Other Expenses OtherExpenses	85000000	usd
CY2024Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	3017000000	usd
CY2024Q1	cna	Operating Income Loss From Continuing Operations Before Income Tax OperatingIncomeLossFromContinuingOperationsBeforeIncomeTax	449000000	usd
CY2024Q1	cna	Income Tax Expense Benefit On Operating Income Loss IncomeTaxExpenseBenefitOnOperatingIncomeLoss	94000000	usd
CY2024Q1	cna	Net Operating Income Loss From Continuing Operations Attributableto Parent NetOperatingIncomeLossFromContinuingOperationsAttributabletoParent	355000000	usd
CY2024Q1	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	-22000000	usd
CY2024Q1	cna	Income Tax Expense Benefit On Net Realized Investment Gains Losses IncomeTaxExpenseBenefitOnNetRealizedInvestmentGainsLosses	-5000000	usd
CY2024Q1	cna	Net Realized Investment Gains Losses NetRealizedInvestmentGainsLosses	-17000000	usd
CY2023Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	407000000	usd
CY2023Q1	us-gaap	Other Income OtherIncome	7000000	usd
CY2023Q1	cna	Operating Revenues OperatingRevenues	3187000000	usd
CY2023Q1	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1646000000	usd
CY2023Q1	us-gaap	Policyholder Dividends PolicyholderDividends	7000000	usd
CY2023Q1	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	379000000	usd
CY2023Q1	cna	Costs From Contract With Customers CostsFromContractWithCustomers	384000000	usd
CY2023Q1	cna	Other Insurance Related Expenses OtherInsuranceRelatedExpenses	305000000	usd
CY2023Q1	us-gaap	Other Expenses OtherExpenses	60000000	usd
CY2023Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	2781000000	usd
CY2023Q1	cna	Operating Income Loss From Continuing Operations Before Income Tax OperatingIncomeLossFromContinuingOperationsBeforeIncomeTax	406000000	usd
CY2023Q1	cna	Income Tax Expense Benefit On Operating Income Loss IncomeTaxExpenseBenefitOnOperatingIncomeLoss	81000000	usd
CY2023Q1	cna	Net Operating Income Loss From Continuing Operations Attributableto Parent NetOperatingIncomeLossFromContinuingOperationsAttributabletoParent	325000000	usd
CY2023Q1	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	-35000000	usd
CY2023Q1	cna	Income Tax Expense Benefit On Net Realized Investment Gains Losses IncomeTaxExpenseBenefitOnNetRealizedInvestmentGainsLosses	-7000000	usd
CY2023Q1	cna	Net Realized Investment Gains Losses NetRealizedInvestmentGainsLosses	-28000000	usd
CY2023Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	297000000	usd
CY2023Q4	us-gaap	Reinsurance Recoverables Gross ReinsuranceRecoverablesGross	5434000000	usd
CY2023Q4	us-gaap	Premiums Receivable Gross PremiumsReceivableGross	3470000000	usd
CY2023Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	896000000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	146000000	usd
CY2023Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	3661000000	usd
CY2023Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	23304000000	usd
CY2023Q4	us-gaap	Unearned Premiums UnearnedPremiums	6933000000	usd
CY2023Q4	us-gaap	Liability For Future Policy Benefits LiabilityForFuturePolicyBenefits	13959000000	usd
CY2023Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	4694000000	usd
CY2024Q1	cna	Revenues Excluding Investments And Derivatives Realized Gain Loss RevenuesExcludingInvestmentsAndDerivativesRealizedGainLoss	3466000000	usd
CY2023Q1	cna	Revenues Excluding Investments And Derivatives Realized Gain Loss RevenuesExcludingInvestmentsAndDerivativesRealizedGainLoss	3187000000	usd
CY2024Q1	cna	Investmentsand Derivatives Realized Gain Loss InvestmentsandDerivativesRealizedGainLoss	-22000000	usd
CY2023Q1	cna	Investmentsand Derivatives Realized Gain Loss InvestmentsandDerivativesRealizedGainLoss	-35000000	usd
CY2024Q1	us-gaap	Revenues Revenues	3444000000	usd
CY2023Q1	us-gaap	Revenues Revenues	3152000000	usd
CY2024Q1	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	4600000000	usd
CY2023Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	4700000000	usd
CY2024Q1	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	400000000	usd
CY2023Q1	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	400000000	usd
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	1100000000	usd
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	1100000000	usd
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	900000000	usd
CY2024Q1	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	1500000000	usd

Files In Submission

Name	View Source	Status
0000021175-24-000039-index-headers.html	Edgar Link	pending
0000021175-24-000039-index.html	Edgar Link	pending
0000021175-24-000039.txt	Edgar Link	pending
0000021175-24-000039-xbrl.zip	Edgar Link	pending
cna-20240331.htm	Edgar Link	pending
cna-20240331.xsd	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
q12024cnaex311.htm	Edgar Link	pending
q12024cnaex312.htm	Edgar Link	pending
q12024cnaex321.htm	Edgar Link	pending
q12024cnaex322.htm	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
cna-20240331_def.xml	Edgar Link	unprocessable
cna-20240331_lab.xml	Edgar Link	unprocessable
cna-20240331_pre.xml	Edgar Link	unprocessable
FilingSummary.xml	Edgar Link	unprocessable
cna-20240331_htm.xml	Edgar Link	completed
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending
cna-20240331_cal.xml	Edgar Link	unprocessable

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$CNA
CNA FINANCIAL CORP Stock $cna

2024 Q2 Form 10-Q Financial Statement

#000002117524000039 Filed on May 06, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CNA CNA FINANCIAL CORP Stock $cna

2024 Q2 Form 10-Q Financial Statement

#000002117524000039 Filed on May 06, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CNA
CNA FINANCIAL CORP Stock $cna