$cinf 2017 Q4 10-K

Concept	2017 Q4	2017 Q3	2017 Q2
Revenue	$1.411B	$1.412B	$1.386B
YoY Change	7.55%	0.71%	1.09%
Cost Of Revenue		$874.0M	$854.0M
YoY Change		16.07%	4.02%
Gross Profit		$538.0M	$532.0M
YoY Change		-17.1%	-3.27%
Gross Profit Margin		38.1%	38.38%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$15.00M	$237.0M	$229.0M
YoY Change	7.14%	6.76%	7.01%
% of Gross Profit		44.05%	43.05%
Operating Expenses	$1.200B	$1.270B	$1.245B
YoY Change	2.56%	11.8%	4.45%
Operating Profit		-$732.0M	-$713.0M
YoY Change		50.31%	11.06%
Interest Expense	-$14.00M	$13.00M	$13.00M
YoY Change	0.0%	0.0%	0.0%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$197.0M	$129.0M	$128.0M
YoY Change	53.91%	-49.01%	-22.89%
Income Tax	$50.00M	$27.00M	$28.00M
% Of Pretax Income	25.38%	20.93%	21.88%
Net Earnings	$642.0M	$102.0M	$100.0M
YoY Change	542.0%	-43.33%	-18.7%
Net Earnings / Revenue	45.5%	7.22%	7.22%
Basic Earnings Per Share	$3.92	$0.62	$0.61
Diluted Earnings Per Share	$3.88	$0.61	$0.60
COMMON SHARES
Basic Shares Outstanding	164.1M shares	164.0M shares	164.3M shares
Diluted Shares Outstanding		165.9M shares	166.0M shares

Concept	2017 Q4	2017 Q3	2017 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$657.0M	$674.0M	$606.0M
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	$185.0M	$186.0M	$184.0M
YoY Change	1.09%	1.09%	-1.08%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$17.05B	$16.66B	$16.39B
YoY Change	10.01%	6.53%	6.05%
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$21.84B	$21.59B	$21.24B
YoY Change	7.15%	5.56%	5.39%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$24.00M	$17.00M	$17.00M
YoY Change	20.0%	-15.0%	-39.29%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$24.00M	$17.00M	$17.00M
YoY Change	20.0%	-15.0%	-39.29%
LONG-TERM LIABILITIES
Long-Term Debt	$827.0M	$826.0M	$826.0M
YoY Change	0.12%	-0.12%	0.12%
Other Long-Term Liabilities	$792.0M	$800.0M	$767.0M
YoY Change	0.76%	0.25%	3.23%
Total Long-Term Liabilities	$1.619B	$1.626B	$1.593B
YoY Change	0.43%	0.06%	1.59%
TOTAL LIABILITIES
Total Short-Term Liabilities	$24.00M	$17.00M	$17.00M
Total Long-Term Liabilities	$1.619B	$1.626B	$1.593B
Total Liabilities	$13.60B	$14.07B	$13.87B
YoY Change	2.06%	5.51%	5.2%
SHAREHOLDERS EQUITY
Retained Earnings	$5.180B	$5.193B	$5.174B
YoY Change	2.84%	3.53%	5.27%
Common Stock	$1.662B	$1.653B	$1.646B
YoY Change	0.79%	0.73%	0.73%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$1.387B	$1.370B	$1.372B
YoY Change	5.16%	6.37%	6.19%
Treasury Stock Shares	34.40M shares	34.30M shares	34.40M shares
Shareholders Equity	$8.243B	$7.523B	$7.373B
YoY Change
Total Liabilities & Shareholders Equity	$21.84B	$21.59B	$21.24B
YoY Change	7.15%	5.56%	5.39%

Concept	2017 Q4	2017 Q3	2017 Q2
OPERATING ACTIVITIES
Net Income	$642.0M	$102.0M	$100.0M
YoY Change	542.0%	-43.33%	-18.7%
Depreciation, Depletion And Amortization	$15.00M	$237.0M	$229.0M
YoY Change	7.14%	6.76%	7.01%
Cash From Operating Activities	$306.0M	$301.0M	$309.0M
YoY Change	5.15%	-7.38%	32.05%
INVESTING ACTIVITIES
Capital Expenditures	-$2.000M	-$5.000M	-$7.000M
YoY Change	-50.0%	150.0%	75.0%
Acquisitions
YoY Change
Other Investing Activities	-$97.00M	-$121.0M	-$80.00M
YoY Change	46.97%	57.14%	-58.97%
Cash From Investing Activities	-$99.00M	-$126.0M	-$87.00M
YoY Change	41.43%	59.49%	-56.28%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-224.0M	-107.0M	-159.0M
YoY Change	55.56%	15.05%	57.43%
NET CHANGE
Cash From Operating Activities	306.0M	301.0M	309.0M
Cash From Investing Activities	-99.00M	-126.0M	-87.00M
Cash From Financing Activities	-224.0M	-107.0M	-159.0M
Net Change In Cash	-17.00M	68.00M	63.00M
YoY Change	-122.08%	-55.56%	-195.45%
FREE CASH FLOW
Cash From Operating Activities	$306.0M	$301.0M	$309.0M
Capital Expenditures	-$2.000M	-$5.000M	-$7.000M
Free Cash Flow	$308.0M	$306.0M	$316.0M
YoY Change	4.41%	-6.42%	32.77%

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2018Q4	cinf	Available For Sale Securities Debt Maturities After One Through Five Years Average AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAverage	0.273
CY2018Q4	cinf	Available For Sale Securities Debt Maturities After Ten Years Average AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAverage	0.330
CY2018Q4	cinf	Available For Sale Securities Debt Maturities Average AvailableForSaleSecuritiesDebtMaturitiesAverage	1
CY2018Q4	cinf	Available For Sale Securities Debt Maturities Within One Year Average AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAverage	0.055
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CY2018Q4	cinf	Available For Sale Securities Equity Securities Cost AvailableForSaleSecuritiesEquitySecuritiesCost	3368000000	USD
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CY2017Q4	cinf	Availableforsale Securities Continuous Unrealized Loss Position12 Monthsor Longer Aggregate Loss Accumulatedin Investments AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAggregateLossAccumulatedinInvestments	18000000	USD
CY2018Q4	cinf	Availableforsale Securities Continuous Unrealized Loss Position12 Monthsor Longer Aggregate Loss Accumulatedin Investments AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAggregateLossAccumulatedinInvestments	58000000	USD
CY2017Q4	cinf	Deferred Tax Liabilities Policy Liabilities Life DeferredTaxLiabilitiesPolicyLiabilitiesLife	111000000	USD
CY2018Q4	cinf	Deferred Tax Liabilities Policy Liabilities Life DeferredTaxLiabilitiesPolicyLiabilitiesLife	117000000	USD
CY2017Q4	cinf	Deferred Tax Liabilities Unrealized Gains And Losses On Investments DeferredTaxLiabilitiesUnrealizedGainsAndLossesOnInvestments	740000000	USD
CY2018Q4	cinf	Deferred Tax Liabilities Unrealized Gains And Losses On Investments DeferredTaxLiabilitiesUnrealizedGainsAndLossesOnInvestments	542000000	USD
CY2017	cinf	Defined Benefit Plan Actual Percentage Return On Plan Assets DefinedBenefitPlanActualPercentageReturnOnPlanAssets	0.174
CY2018	cinf	Defined Benefit Plan Actual Percentage Return On Plan Assets DefinedBenefitPlanActualPercentageReturnOnPlanAssets	0.017
CY2016	cinf	Defined Benefit Plan Amortization Of Net Actuarial Gain Loss And Prior Service Cost Or Benefit DefinedBenefitPlanAmortizationOfNetActuarialGainLossAndPriorServiceCostOrBenefit	3000000	USD
CY2017	cinf	Defined Benefit Plan Amortization Of Net Actuarial Gain Loss And Prior Service Cost Or Benefit DefinedBenefitPlanAmortizationOfNetActuarialGainLossAndPriorServiceCostOrBenefit	2000000	USD
CY2018	cinf	Defined Benefit Plan Amortization Of Net Actuarial Gain Loss And Prior Service Cost Or Benefit DefinedBenefitPlanAmortizationOfNetActuarialGainLossAndPriorServiceCostOrBenefit	1000000	USD
CY2008	cinf	Defined Benefit Plan Qualifying Age DefinedBenefitPlanQualifyingAge	P40Y
CY2018	cinf	Defined Contribution Plan Requisite Service Period DefinedContributionPlanRequisiteServicePeriod	P3Y
CY2018	cinf	Dividend To Parent DividendToParent	0.10
CY2016	cinf	Effective Income Tax Rate Reconciliation Tax Accounting Method Changes Amount EffectiveIncomeTaxRateReconciliationTaxAccountingMethodChangesAmount	0	USD
CY2017	cinf	Effective Income Tax Rate Reconciliation Tax Accounting Method Changes Amount EffectiveIncomeTaxRateReconciliationTaxAccountingMethodChangesAmount	0	USD
CY2018	cinf	Effective Income Tax Rate Reconciliation Tax Accounting Method Changes Amount EffectiveIncomeTaxRateReconciliationTaxAccountingMethodChangesAmount	-50000000	USD
CY2016	cinf	Effective Income Tax Rate Reconciliation Tax Accounting Method Changes Percent EffectiveIncomeTaxRateReconciliationTaxAccountingMethodChangesPercent	0.000
CY2017	cinf	Effective Income Tax Rate Reconciliation Tax Accounting Method Changes Percent EffectiveIncomeTaxRateReconciliationTaxAccountingMethodChangesPercent	0.000
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CY2017	cinf	Investment Income Other Long Term Investments InvestmentIncomeOtherLongTermInvestments	4000000	USD
CY2018	cinf	Investment Income Other Long Term Investments InvestmentIncomeOtherLongTermInvestments	5000000	USD
CY2018Q4	cinf	Largest Single Common Stock Holding LargestSingleCommonStockHolding	255000000	USD
CY2018Q4	cinf	Largestequityholdingstototalequityportfolio Largestequityholdingstototalequityportfolio	0.044
CY2018Q4	cinf	Largestequityholdingstototalportfolio Largestequityholdingstototalportfolio	0.015
CY2018	cinf	Line Of Credit Facility Term LineOfCreditFacilityTerm	P5Y
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CY2018Q4	cinf	Number Of Securities Other Than Temporary Impairment Losses NumberOfSecuritiesOtherThanTemporaryImpairmentLosses	1
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CY2018	cinf	Numberof Industries Operated In NumberofIndustriesOperatedIn	2	industry
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CY2018	cinf	Numberofequitycompensationplans Numberofequitycompensationplans	4	compensation_plans
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CY2017	cinf	Numberofpeersexceeded Numberofpeersexceeded	5	peers_exceeded
CY2018	cinf	Numberofpeersexceeded Numberofpeersexceeded	4	peers_exceeded
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CY2017	cinf	Numberofpeersinpeergroup Numberofpeersinpeergroup	9	Peers
CY2018	cinf	Numberofpeersinpeergroup Numberofpeersinpeergroup	9	Peers
CY2016	cinf	Other Comprehensive Income Change In Life Deferred Acquisition Costs Life Policy Reserves And Other Tax OtherComprehensiveIncomeChangeInLifeDeferredAcquisitionCostsLifePolicyReservesAndOtherTax	-4000000	USD
CY2017	cinf	Other Comprehensive Income Change In Life Deferred Acquisition Costs Life Policy Reserves And Other Tax OtherComprehensiveIncomeChangeInLifeDeferredAcquisitionCostsLifePolicyReservesAndOtherTax	1000000	USD
CY2018	cinf	Other Comprehensive Income Change In Life Deferred Acquisition Costs Life Policy Reserves And Other Tax OtherComprehensiveIncomeChangeInLifeDeferredAcquisitionCostsLifePolicyReservesAndOtherTax	2000000	USD
CY2016	cinf	Other Comprehensive Income Change In Life Deferred Acquistion Costs Life Policy Reserves And Other Net Of Tax OtherComprehensiveIncomeChangeInLifeDeferredAcquistionCostsLifePolicyReservesAndOtherNetOfTax	6000000	USD
CY2017	cinf	Other Comprehensive Income Change In Life Deferred Acquistion Costs Life Policy Reserves And Other Net Of Tax OtherComprehensiveIncomeChangeInLifeDeferredAcquistionCostsLifePolicyReservesAndOtherNetOfTax	2000000	USD
CY2018	cinf	Other Comprehensive Income Change In Life Deferred Acquistion Costs Life Policy Reserves And Other Net Of Tax OtherComprehensiveIncomeChangeInLifeDeferredAcquistionCostsLifePolicyReservesAndOtherNetOfTax	-7000000	USD
CY2016	cinf	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Actuarial Loss And Prior Service Cost Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetActuarialLossAndPriorServiceCostArisingDuringPeriodBeforeTax	-10000000	USD
CY2017	cinf	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Actuarial Loss And Prior Service Cost Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetActuarialLossAndPriorServiceCostArisingDuringPeriodBeforeTax	-7000000	USD
CY2018	cinf	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Actuarial Loss And Prior Service Cost Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetActuarialLossAndPriorServiceCostArisingDuringPeriodBeforeTax	3000000	USD
CY2016	cinf	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Actuarial Loss And Prior Service Cost Arising During Period Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetActuarialLossAndPriorServiceCostArisingDuringPeriodTax	6000000	USD
CY2017	cinf	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Actuarial Loss And Prior Service Cost Arising During Period Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetActuarialLossAndPriorServiceCostArisingDuringPeriodTax	7000000	USD
CY2018	cinf	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Actuarial Loss And Prior Service Cost Arising During Period Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetActuarialLossAndPriorServiceCostArisingDuringPeriodTax	-1000000	USD
CY2016	cinf	Other Comprehensive Income Loss Unrealized Holding Gain Losson Securities Arising During Period Heldby Subsidiariesand Otherbefore Tax OtherComprehensiveIncomeLossUnrealizedHoldingGainLossonSecuritiesArisingDuringPeriodHeldbySubsidiariesandOtherbeforeTax	521000000	USD
CY2017	cinf	Other Comprehensive Income Loss Unrealized Holding Gain Losson Securities Arising During Period Heldby Subsidiariesand Otherbefore Tax OtherComprehensiveIncomeLossUnrealizedHoldingGainLossonSecuritiesArisingDuringPeriodHeldbySubsidiariesandOtherbeforeTax	914000000	USD
CY2018	cinf	Other Comprehensive Income Loss Unrealized Holding Gain Losson Securities Arising During Period Heldby Subsidiariesand Otherbefore Tax OtherComprehensiveIncomeLossUnrealizedHoldingGainLossonSecuritiesArisingDuringPeriodHeldbySubsidiariesandOtherbeforeTax	-330000000	USD
CY2016	cinf	Other Realized Investment Gains Losses Net OtherRealizedInvestmentGainsLossesNet	2000000	USD
CY2017	cinf	Other Realized Investment Gains Losses Net OtherRealizedInvestmentGainsLossesNet	9000000	USD
CY2018	cinf	Other Realized Investment Gains Losses Net OtherRealizedInvestmentGainsLossesNet	-12000000	USD
CY2017Q4	cinf	Percentage Of Reserves For Asbestos And Environmental Claims PercentageOfReservesForAsbestosAndEnvironmentalClaims	0.020
CY2018Q4	cinf	Percentage Of Reserves For Asbestos And Environmental Claims PercentageOfReservesForAsbestosAndEnvironmentalClaims	0.020
CY2018	cinf	Percentage Of Statutory Net Income From Prior Year PercentageOfStatutoryNetIncomeFromPriorYear	1.00
CY2016	cinf	Purchase Of Treasury Shares Non Cash PurchaseOfTreasurySharesNonCash	13000000	USD
CY2017	cinf	Purchase Of Treasury Shares Non Cash PurchaseOfTreasurySharesNonCash	7000000	USD
CY2018	cinf	Purchase Of Treasury Shares Non Cash PurchaseOfTreasurySharesNonCash	5000000	USD
CY2016	cinf	Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodTotalIntrinsicValue	11000000	USD
CY2017	cinf	Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodTotalIntrinsicValue	8000000	USD
CY2018	cinf	Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodTotalIntrinsicValue	6000000	USD
CY2017	cinf	Tax Cutsand Jobs Actof2017 Incomplete Accounting Changein Tax Rate Deferred Tax Liability Provisional Income Tax Benefit TaxCutsandJobsActof2017IncompleteAccountingChangeinTaxRateDeferredTaxLiabilityProvisionalIncomeTaxBenefit	495000000	USD
CY2016	cinf	Underwriting Acquisition And Insurance Expenses UnderwritingAcquisitionAndInsuranceExpenses	1465000000	USD
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CY2018Q4	cinf	Unrealizedgainsreclassifiedtoretainedearningsfor Asu201601aftertax UnrealizedgainsreclassifiedtoretainedearningsforASU201601aftertax	2503000000	USD
CY2018	dei	Amendment Flag AmendmentFlag	false
CY2018	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2018	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2018	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2018
CY2018	dei	Document Period End Date DocumentPeriodEndDate	2018-12-31
CY2018	dei	Document Type DocumentType	10-K
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CY2018	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
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CY2018	dei	Entity Registrant Name EntityRegistrantName	CINCINNATI FINANCIAL CORP
CY2018	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2018	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
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CY2018Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	132000000	USD
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	253000000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	265000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	2788000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	22000000	USD
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1265000000	USD
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CY2016	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	15000000	USD
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CY2017Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	10314000000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	10643000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	18000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	38000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	1491000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	20000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	809000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	682000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	3663000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	3653000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	2894000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	2912000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	3500000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	3532000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	586000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	592000000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	10699000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	10689000000	USD
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CY2017	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	14000000	USD
CY2018	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	21000000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	40000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	46000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	16000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	4000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	6000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	9000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	12000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	2000000	USD
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CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	784000000	USD
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CY2018	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	127000000	USD
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CY2017	us-gaap	Ceded Premiums Earned CededPremiumsEarned	230000000	USD
CY2018	us-gaap	Ceded Premiums Earned CededPremiumsEarned	230000000	USD
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CY2018Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	USD
CY2016	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.92
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CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.12
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	2
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CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	198300000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	198300000	shares
CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	198300000	shares
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	198300000	shares
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	397000000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	397000000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	940000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1648000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	24000000	USD
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CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	183000000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	129000000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	11000000	USD
CY2017Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	793000000	USD
CY2018Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	793000000	USD
CY2017Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	1040000000	USD
CY2018Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	975000000	USD
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CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-47000000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	995000000	USD
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CY2018	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	946000000	USD
CY2016	us-gaap	Deferred Policy Acquisition Cost Amortization Expense Other DeferredPolicyAcquisitionCostAmortizationExpenseOther	5000000	USD
CY2017	us-gaap	Deferred Policy Acquisition Cost Amortization Expense Other DeferredPolicyAcquisitionCostAmortizationExpenseOther	2000000	USD
CY2018	us-gaap	Deferred Policy Acquisition Cost Amortization Expense Other DeferredPolicyAcquisitionCostAmortizationExpenseOther	-21000000	USD
CY2015Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	616000000	USD
CY2016Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	637000000	USD
CY2017Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	670000000	USD
CY2018Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	738000000	USD
CY2016	us-gaap	Deferred Policy Acquisition Costs Additions DeferredPolicyAcquisitionCostsAdditions	889000000	USD
CY2017	us-gaap	Deferred Policy Acquisition Costs Additions DeferredPolicyAcquisitionCostsAdditions	948000000	USD
CY2018	us-gaap	Deferred Policy Acquisition Costs Additions DeferredPolicyAcquisitionCostsAdditions	993000000	USD
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CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	198000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	27000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	33000000	USD
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CY2018Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Policy Acquisition Cost DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost	131000000	USD
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CY2017Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	12000000	USD
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CY2018Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax	0	USD
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CY2018	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	19000000	USD
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CY2017	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax	0	USD
CY2018	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax	0	USD
CY2016Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	340000000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	351000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	318000000	USD
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CY2018	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	38000000	USD
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CY2018Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	43000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	22000000	USD
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CY2016Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	315000000	USD
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CY2018Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	318000000	USD
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CY2017	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	14000000	USD
CY2018	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	13000000	USD
CY2016	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	9000000	USD
CY2017	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	7000000	USD
CY2018	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	5000000	USD
CY2017	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	34000000	USD
CY2018	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	38000000	USD
CY2016	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1	0	USD
CY2017	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1	-1000000	USD
CY2018	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1	-2000000	USD
CY2016	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	11000000	USD
CY2017	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	11000000	USD
CY2018	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	11000000	USD
CY2016	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	14000000	USD
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CY2018	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	18000000	USD
CY2016	us-gaap	Depreciation Depreciation	30000000	USD
CY2017	us-gaap	Depreciation Depreciation	28000000	USD
CY2018	us-gaap	Depreciation Depreciation	31000000	USD
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CY2017	us-gaap	Direct Premiums Earned DirectPremiumsEarned	5052000000	USD
CY2018	us-gaap	Direct Premiums Earned DirectPremiumsEarned	5251000000	USD
CY2016	us-gaap	Dividends Dividends	475000000	USD
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CY2018	us-gaap	Dividends Dividends	500000000	USD
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CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.76
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CY2018Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	30000000	USD
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CY2017	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	0	USD
CY2018	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	0	USD
CY2017	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	0	USD
CY2018	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	0	USD
CY2017	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	0	USD
CY2018	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	1000000	USD
CY2017	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	5000000	USD
CY2018	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	0	USD
CY2017	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	0	USD
CY2018	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	0	USD
CY2017	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3	0	USD
CY2018	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3	0	USD
CY2017	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	77000000	USD
CY2018	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	0	USD
CY2016Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	78000000	USD
CY2017Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	6000000	USD
CY2018Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	5000000	USD
CY2016	us-gaap	Fees And Commissions FeesAndCommissions	15000000	USD
CY2017	us-gaap	Fees And Commissions FeesAndCommissions	16000000	USD
CY2018	us-gaap	Fees And Commissions FeesAndCommissions	15000000	USD
CY2016	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	124000000	USD
CY2017	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	148000000	USD
CY2018	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	-408000000	USD
CY2016	us-gaap	Gross Investment Income Operating GrossInvestmentIncomeOperating	604000000	USD
CY2017	us-gaap	Gross Investment Income Operating GrossInvestmentIncomeOperating	619000000	USD
CY2018	us-gaap	Gross Investment Income Operating GrossInvestmentIncomeOperating	631000000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	812000000	USD
CY2017Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	276000000	USD
CY2017Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	128000000	USD
CY2017Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	129000000	USD
CY2017Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	197000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	730000000	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-50000000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	264000000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	618000000	USD
CY2018Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-581000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	251000000	USD
CY2018	us-gaap	Income Tax Examination Penalties Expense IncomeTaxExaminationPenaltiesExpense	0	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	221000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-315000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-36000000	USD
CY2016	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-495000000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2016	us-gaap	Income Tax Reconciliation Deductions Dividends IncomeTaxReconciliationDeductionsDividends	33000000	USD
CY2017	us-gaap	Income Tax Reconciliation Deductions Dividends IncomeTaxReconciliationDeductionsDividends	34000000	USD
CY2018	us-gaap	Income Tax Reconciliation Deductions Dividends IncomeTaxReconciliationDeductionsDividends	15000000	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	284000000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	256000000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	53000000	USD
CY2016	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	4000000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-6000000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-4000000	USD
CY2016	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	34000000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	36000000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	20000000	USD
CY2016	us-gaap	Income Taxes Paid IncomeTaxesPaid	213000000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	60000000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	98000000	USD
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2000000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	18000000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	0	USD
CY2016	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	5000000	USD
CY2017	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	0	USD
CY2018	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	-2000000	USD
CY2016	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	35000000	USD
CY2017	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-67000000	USD
CY2018	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	91000000	USD
CY2016	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	26000000	USD
CY2017	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	36000000	USD
CY2018	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	48000000	USD
CY2016	us-gaap	Increase Decrease In Future Policy Benefit Reserves IncreaseDecreaseInFuturePolicyBenefitReserves	102000000	USD
CY2017	us-gaap	Increase Decrease In Future Policy Benefit Reserves IncreaseDecreaseInFuturePolicyBenefitReserves	96000000	USD
CY2018	us-gaap	Increase Decrease In Future Policy Benefit Reserves IncreaseDecreaseInFuturePolicyBenefitReserves	96000000	USD
CY2016	us-gaap	Increase Decrease In Insurance Assets IncreaseDecreaseInInsuranceAssets	113000000	USD
CY2017	us-gaap	Increase Decrease In Insurance Assets IncreaseDecreaseInInsuranceAssets	-77000000	USD
CY2018	us-gaap	Increase Decrease In Insurance Assets IncreaseDecreaseInInsuranceAssets	109000000	USD
CY2016	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	367000000	USD
CY2017	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	188000000	USD
CY2018	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	434000000	USD
CY2016	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	61000000	USD
CY2017	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	24000000	USD
CY2018	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	0	USD
CY2016	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-34000000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	43000000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1000000	USD
CY2016	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	106000000	USD
CY2017	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	97000000	USD
CY2018	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	112000000	USD
CY2018	us-gaap	Interest Costs Incurred InterestCostsIncurred	3000000	USD
CY2016	us-gaap	Interest Credited To Policyholders Account Balances InterestCreditedToPolicyholdersAccountBalances	48000000	USD
CY2017	us-gaap	Interest Credited To Policyholders Account Balances InterestCreditedToPolicyholdersAccountBalances	48000000	USD
CY2018	us-gaap	Interest Credited To Policyholders Account Balances InterestCreditedToPolicyholdersAccountBalances	47000000	USD
CY2016	us-gaap	Interest Expense InterestExpense	53000000	USD
CY2017	us-gaap	Interest Expense InterestExpense	53000000	USD
CY2018	us-gaap	Interest Expense InterestExpense	53000000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	52000000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	52000000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	53000000	USD
CY2016	us-gaap	Investment Income Dividend InvestmentIncomeDividend	161000000	USD
CY2017	us-gaap	Investment Income Dividend InvestmentIncomeDividend	170000000	USD
CY2018	us-gaap	Investment Income Dividend InvestmentIncomeDividend	181000000	USD
CY2016	us-gaap	Investment Income Interest InvestmentIncomeInterest	440000000	USD
CY2017	us-gaap	Investment Income Interest InvestmentIncomeInterest	445000000	USD
CY2018	us-gaap	Investment Income Interest InvestmentIncomeInterest	445000000	USD
CY2016	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	9000000	USD
CY2017	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	10000000	USD
CY2018	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	12000000	USD
CY2017Q4	us-gaap	Investments Investments	17051000000	USD
CY2018Q4	us-gaap	Investments Investments	16732000000	USD
CY2017Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	17774000000	USD
CY2018Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	17434000000	USD
CY2017Q4	us-gaap	Liabilities Liabilities	13600000000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	14102000000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	21843000000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	21935000000	USD
CY2016	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	53000000	USD
CY2017	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	75000000	USD
CY2018	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	48000000	USD
CY2017Q4	us-gaap	Liabilities Related To Investment Contracts Fair Value Disclosure LiabilitiesRelatedToInvestmentContractsFairValueDisclosure	1044000000	USD
CY2018Q4	us-gaap	Liabilities Related To Investment Contracts Fair Value Disclosure LiabilitiesRelatedToInvestmentContractsFairValueDisclosure	927000000	USD
CY2017Q4	us-gaap	Liability For Asbestos And Environmental Claims Net LiabilityForAsbestosAndEnvironmentalClaimsNet	84000000	USD
CY2018Q4	us-gaap	Liability For Asbestos And Environmental Claims Net LiabilityForAsbestosAndEnvironmentalClaimsNet	89000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	827000000	USD
CY2015Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	4660000000	USD
CY2016Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	5035000000	USD
CY2017Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	5219000000	USD
CY2018Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	5646000000	USD
CY2017Q4	us-gaap	Liability For Claims And Claims Adjustment Expense Property Casualty Liability LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability	5273000000	USD
CY2018Q4	us-gaap	Liability For Claims And Claims Adjustment Expense Property Casualty Liability LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability	5707000000	USD
CY2017Q4	us-gaap	Liability For Future Policy Benefits Life LiabilityForFuturePolicyBenefitsLife	2729000000	USD
CY2018Q4	us-gaap	Liability For Future Policy Benefits Life LiabilityForFuturePolicyBenefitsLife	2779000000	USD
CY2016	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	1260000000	USD
CY2017	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	1404000000	USD
CY2018	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	1391000000	USD
CY2016	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	1243000000	USD
CY2017	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	1439000000	USD
CY2018	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	1456000000	USD
CY2016	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	2861000000	USD
CY2017	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	3138000000	USD
CY2018	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	3223000000	USD
CY2015Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	4379000000	USD
CY2016Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	4737000000	USD
CY2017Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	5032000000	USD
CY2018Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	5408000000	USD
CY2016Q4	us-gaap	Life Insurance In Force Assumed LifeInsuranceInForceAssumed	0	USD
CY2017Q4	us-gaap	Life Insurance In Force Assumed LifeInsuranceInForceAssumed	0	USD
CY2018Q4	us-gaap	Life Insurance In Force Assumed LifeInsuranceInForceAssumed	0	USD
CY2016Q4	us-gaap	Life Insurance In Force Ceded LifeInsuranceInForceCeded	38724000000	USD
CY2017Q4	us-gaap	Life Insurance In Force Ceded LifeInsuranceInForceCeded	38711000000	USD
CY2018Q4	us-gaap	Life Insurance In Force Ceded LifeInsuranceInForceCeded	38584000000	USD
CY2016Q4	us-gaap	Life Insurance In Force Gross LifeInsuranceInForceGross	95533000000	USD

CY2018Q4

cinf

Available For Sale Securities Debt Maturities After Five Through Ten Years Average

AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAverage

0.342

CY2018Q4

cinf

Available For Sale Securities Debt Maturities After One Through Five Years Average

AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAverage

0.273

CY2018Q4

cinf

Available For Sale Securities Debt Maturities After Ten Years Average

AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAverage

0.330

CY2018Q4

cinf

Available For Sale Securities Debt Maturities Average

AvailableForSaleSecuritiesDebtMaturitiesAverage

1

CY2018Q4

cinf

Available For Sale Securities Debt Maturities Within One Year Average

AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAverage

0.055

CY2017Q4

cinf

Available For Sale Securities Equity Securities Cost

AvailableForSaleSecuritiesEquitySecuritiesCost

3094000000

USD

CY2018Q4

cinf

Available For Sale Securities Equity Securities Cost

AvailableForSaleSecuritiesEquitySecuritiesCost

3368000000

USD

CY2016Q4

cinf

Availableforsale Securities Continuous Unrealized Loss Position12 Monthsor Longer Aggregate Loss Accumulatedin Investments

AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAggregateLossAccumulatedinInvestments

11000000

USD

CY2017Q4

cinf

Availableforsale Securities Continuous Unrealized Loss Position12 Monthsor Longer Aggregate Loss Accumulatedin Investments

AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAggregateLossAccumulatedinInvestments

18000000

USD

CY2018Q4

cinf

Availableforsale Securities Continuous Unrealized Loss Position12 Monthsor Longer Aggregate Loss Accumulatedin Investments

AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsorLongerAggregateLossAccumulatedinInvestments

58000000

USD

CY2017Q4

cinf

Deferred Tax Liabilities Policy Liabilities Life

DeferredTaxLiabilitiesPolicyLiabilitiesLife

111000000

USD

CY2018Q4

cinf

Deferred Tax Liabilities Policy Liabilities Life

DeferredTaxLiabilitiesPolicyLiabilitiesLife

117000000

USD

CY2017Q4

cinf

Deferred Tax Liabilities Unrealized Gains And Losses On Investments

DeferredTaxLiabilitiesUnrealizedGainsAndLossesOnInvestments

740000000

USD

CY2018Q4

cinf

Deferred Tax Liabilities Unrealized Gains And Losses On Investments

DeferredTaxLiabilitiesUnrealizedGainsAndLossesOnInvestments

542000000

USD

CY2017

cinf

Defined Benefit Plan Actual Percentage Return On Plan Assets

DefinedBenefitPlanActualPercentageReturnOnPlanAssets

0.174

CY2018

cinf

Defined Benefit Plan Actual Percentage Return On Plan Assets

DefinedBenefitPlanActualPercentageReturnOnPlanAssets

0.017

CY2016

cinf

Defined Benefit Plan Amortization Of Net Actuarial Gain Loss And Prior Service Cost Or Benefit

DefinedBenefitPlanAmortizationOfNetActuarialGainLossAndPriorServiceCostOrBenefit

3000000

USD

CY2017

cinf

Defined Benefit Plan Amortization Of Net Actuarial Gain Loss And Prior Service Cost Or Benefit

DefinedBenefitPlanAmortizationOfNetActuarialGainLossAndPriorServiceCostOrBenefit

2000000

USD

CY2018

cinf

Defined Benefit Plan Amortization Of Net Actuarial Gain Loss And Prior Service Cost Or Benefit

DefinedBenefitPlanAmortizationOfNetActuarialGainLossAndPriorServiceCostOrBenefit

1000000

USD

CY2008

cinf

Defined Benefit Plan Qualifying Age

DefinedBenefitPlanQualifyingAge

P40Y

CY2018

cinf

Defined Contribution Plan Requisite Service Period

DefinedContributionPlanRequisiteServicePeriod

P3Y

CY2018

cinf

Dividend To Parent

DividendToParent

0.10

CY2016

cinf

Effective Income Tax Rate Reconciliation Tax Accounting Method Changes Amount

EffectiveIncomeTaxRateReconciliationTaxAccountingMethodChangesAmount

0

USD

CY2017

cinf

Effective Income Tax Rate Reconciliation Tax Accounting Method Changes Amount

EffectiveIncomeTaxRateReconciliationTaxAccountingMethodChangesAmount

0

USD

CY2018

cinf

Effective Income Tax Rate Reconciliation Tax Accounting Method Changes Amount

EffectiveIncomeTaxRateReconciliationTaxAccountingMethodChangesAmount

-50000000

USD

CY2016

cinf

Effective Income Tax Rate Reconciliation Tax Accounting Method Changes Percent

EffectiveIncomeTaxRateReconciliationTaxAccountingMethodChangesPercent

0.000

CY2017

cinf

Effective Income Tax Rate Reconciliation Tax Accounting Method Changes Percent

EffectiveIncomeTaxRateReconciliationTaxAccountingMethodChangesPercent

0.000

CY2018

cinf

Effective Income Tax Rate Reconciliation Tax Accounting Method Changes Percent

EffectiveIncomeTaxRateReconciliationTaxAccountingMethodChangesPercent

-0.199

CY2018Q4

cinf

Independent Insurance Agencies And Brokerages

IndependentInsuranceAgenciesAndBrokerages

1757

independent_insurance_agency

CY2016

cinf

Investment Income Other Long Term Investments

InvestmentIncomeOtherLongTermInvestments

3000000

USD

CY2017

cinf

Investment Income Other Long Term Investments

InvestmentIncomeOtherLongTermInvestments

4000000

USD

CY2018

cinf

Investment Income Other Long Term Investments

InvestmentIncomeOtherLongTermInvestments

5000000

USD

CY2018Q4

cinf

Largest Single Common Stock Holding

LargestSingleCommonStockHolding

255000000

USD

CY2018Q4

cinf

Largestequityholdingstototalequityportfolio

0.044

CY2018Q4

cinf

Largestequityholdingstototalportfolio

0.015

CY2018

cinf

Line Of Credit Facility Term

LineOfCreditFacilityTerm

P5Y

CY2018

cinf

Maximum Number Of Shares Awarded To Each Full Time Employee For Their Service

MaximumNumberOfSharesAwardedToEachFullTimeEmployeeForTheirService

10

shares

CY2017Q4

cinf

Number Of Credit Facilities

NumberOfCreditFacilities

1

CY2018Q4

cinf

Number Of Credit Facilities

NumberOfCreditFacilities

1

CY2018

cinf

Number Of Locations

NumberOfLocations

2344

reporting_locations

CY2016Q4

cinf

Number Of Securities Other Than Temporary Impairment Losses

NumberOfSecuritiesOtherThanTemporaryImpairmentLosses

4

CY2017Q4

cinf

Number Of Securities Other Than Temporary Impairment Losses

NumberOfSecuritiesOtherThanTemporaryImpairmentLosses

6

CY2018Q4

cinf

Number Of Securities Other Than Temporary Impairment Losses

NumberOfSecuritiesOtherThanTemporaryImpairmentLosses

1

CY2018

cinf

Number Of Subsidiaries

NumberOfSubsidiaries

2

subsidiary

CY2018

cinf

Numberof Industries Operated In

NumberofIndustriesOperatedIn

2

industry

CY2018

cinf

Numberof Insurance Segments

NumberofInsuranceSegments

4

segment

CY2018

cinf

Numberofequitycompensationplans

4

compensation_plans

CY2016

cinf

Numberofpeersexceeded

5

peers_exceeded

CY2017

cinf

Numberofpeersexceeded

5

peers_exceeded

CY2018

cinf

Numberofpeersexceeded

4

peers_exceeded

CY2016

cinf

Numberofpeersinpeergroup

9

Peers

CY2017

cinf

Numberofpeersinpeergroup

9

Peers

CY2018

cinf

Numberofpeersinpeergroup

9

Peers

CY2016

cinf

Other Comprehensive Income Change In Life Deferred Acquisition Costs Life Policy Reserves And Other Tax

OtherComprehensiveIncomeChangeInLifeDeferredAcquisitionCostsLifePolicyReservesAndOtherTax

-4000000

USD

CY2017

cinf

Other Comprehensive Income Change In Life Deferred Acquisition Costs Life Policy Reserves And Other Tax

OtherComprehensiveIncomeChangeInLifeDeferredAcquisitionCostsLifePolicyReservesAndOtherTax

1000000

USD

CY2018

cinf

Other Comprehensive Income Change In Life Deferred Acquisition Costs Life Policy Reserves And Other Tax

OtherComprehensiveIncomeChangeInLifeDeferredAcquisitionCostsLifePolicyReservesAndOtherTax

2000000

USD

CY2016

cinf

Other Comprehensive Income Change In Life Deferred Acquistion Costs Life Policy Reserves And Other Net Of Tax

OtherComprehensiveIncomeChangeInLifeDeferredAcquistionCostsLifePolicyReservesAndOtherNetOfTax

6000000

USD

CY2017

cinf

Other Comprehensive Income Change In Life Deferred Acquistion Costs Life Policy Reserves And Other Net Of Tax

OtherComprehensiveIncomeChangeInLifeDeferredAcquistionCostsLifePolicyReservesAndOtherNetOfTax

2000000

USD

CY2018

cinf

Other Comprehensive Income Change In Life Deferred Acquistion Costs Life Policy Reserves And Other Net Of Tax

OtherComprehensiveIncomeChangeInLifeDeferredAcquistionCostsLifePolicyReservesAndOtherNetOfTax

-7000000

USD

CY2016

cinf

Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Actuarial Loss And Prior Service Cost Arising During Period Before Tax

OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetActuarialLossAndPriorServiceCostArisingDuringPeriodBeforeTax

-10000000

USD

CY2017

cinf

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DefinedBenefitPlanActuarialGainLoss

19000000

USD

CY2017Q4

us-gaap

Defined Benefit Plan Amounts Recognized In Balance Sheet

DefinedBenefitPlanAmountsRecognizedInBalanceSheet

-6000000

USD

CY2018Q4

us-gaap

Defined Benefit Plan Amounts Recognized In Balance Sheet

DefinedBenefitPlanAmountsRecognizedInBalanceSheet

0

USD

CY2016

us-gaap

Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Net Prior Service Cost Credit Before Tax

DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax

-1000000

USD

CY2017

us-gaap

Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Net Prior Service Cost Credit Before Tax

DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax

0

USD

CY2018

us-gaap

Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Net Prior Service Cost Credit Before Tax

DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax

0

USD

CY2016Q4

us-gaap

Defined Benefit Plan Benefit Obligation

DefinedBenefitPlanBenefitObligation

340000000

USD

CY2017Q4

us-gaap

Defined Benefit Plan Benefit Obligation

DefinedBenefitPlanBenefitObligation

351000000

USD

CY2018Q4

us-gaap

Defined Benefit Plan Benefit Obligation

DefinedBenefitPlanBenefitObligation

318000000

USD

CY2017

us-gaap

Defined Benefit Plan Benefit Obligation Benefits Paid

DefinedBenefitPlanBenefitObligationBenefitsPaid

34000000

USD

CY2018

us-gaap

Defined Benefit Plan Benefit Obligation Benefits Paid

DefinedBenefitPlanBenefitObligationBenefitsPaid

38000000

USD

CY2017

us-gaap

Defined Benefit Plan Contributions By Employer

DefinedBenefitPlanContributionsByEmployer

12000000

USD

CY2018

us-gaap

Defined Benefit Plan Contributions By Employer

DefinedBenefitPlanContributionsByEmployer

15000000

USD

CY2018Q4

us-gaap

Defined Benefit Plan Expected Amortization Of Gain Loss Next Fiscal Year

DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear

-1000000

USD

CY2018Q4

us-gaap

Defined Benefit Plan Expected Amortization Of Prior Service Cost Credit Next Fiscal Year

DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear

1000000

USD

CY2018Q4

us-gaap

Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter

DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

140000000

USD

CY2018Q4

us-gaap

Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months

DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

43000000

USD

CY2018Q4

us-gaap

Defined Benefit Plan Expected Future Benefit Payments Year Five

DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

22000000

USD

CY2018Q4

us-gaap

Defined Benefit Plan Expected Future Benefit Payments Year Four

DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

21000000

USD

CY2018Q4

us-gaap

Defined Benefit Plan Expected Future Benefit Payments Year Three

DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

22000000

USD

CY2018Q4

us-gaap

Defined Benefit Plan Expected Future Benefit Payments Year Two

DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

23000000

USD

CY2016

us-gaap

Defined Benefit Plan Expected Return On Plan Assets

DefinedBenefitPlanExpectedReturnOnPlanAssets

19000000

USD

CY2017

us-gaap

Defined Benefit Plan Expected Return On Plan Assets

DefinedBenefitPlanExpectedReturnOnPlanAssets

21000000

USD

CY2018

us-gaap

Defined Benefit Plan Expected Return On Plan Assets

DefinedBenefitPlanExpectedReturnOnPlanAssets

22000000

USD

CY2016Q4

us-gaap

Defined Benefit Plan Fair Value Of Plan Assets

DefinedBenefitPlanFairValueOfPlanAssets

315000000

USD

CY2017Q4

us-gaap

Defined Benefit Plan Fair Value Of Plan Assets

DefinedBenefitPlanFairValueOfPlanAssets

345000000

USD

CY2018Q4

us-gaap

Defined Benefit Plan Fair Value Of Plan Assets

DefinedBenefitPlanFairValueOfPlanAssets

318000000

USD

CY2017Q4

us-gaap

Defined Benefit Plan Funded Status Of Plan

DefinedBenefitPlanFundedStatusOfPlan

-6000000

USD

CY2018Q4

us-gaap

Defined Benefit Plan Funded Status Of Plan

DefinedBenefitPlanFundedStatusOfPlan

0

USD

CY2016

us-gaap

Defined Benefit Plan Interest Cost

DefinedBenefitPlanInterestCost

14000000

USD

CY2017

us-gaap

Defined Benefit Plan Interest Cost

DefinedBenefitPlanInterestCost

14000000

USD

CY2018

us-gaap

Defined Benefit Plan Interest Cost

DefinedBenefitPlanInterestCost

13000000

USD

CY2016

us-gaap

Defined Benefit Plan Net Periodic Benefit Cost

DefinedBenefitPlanNetPeriodicBenefitCost

9000000

USD

CY2017

us-gaap

Defined Benefit Plan Net Periodic Benefit Cost

DefinedBenefitPlanNetPeriodicBenefitCost

7000000

USD

CY2018

us-gaap

Defined Benefit Plan Net Periodic Benefit Cost

DefinedBenefitPlanNetPeriodicBenefitCost

5000000

USD

CY2017

us-gaap

Defined Benefit Plan Plan Assets Benefits Paid

DefinedBenefitPlanPlanAssetsBenefitsPaid

34000000

USD

CY2018

us-gaap

Defined Benefit Plan Plan Assets Benefits Paid

DefinedBenefitPlanPlanAssetsBenefitsPaid

38000000

USD

CY2016

us-gaap

Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1

DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1

0

USD

CY2017

us-gaap

Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1

DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1

-1000000

USD

CY2018

us-gaap

Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1

DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1

-2000000

USD

CY2016

us-gaap

Defined Benefit Plan Service Cost

DefinedBenefitPlanServiceCost

11000000

USD

CY2017

us-gaap

Defined Benefit Plan Service Cost

DefinedBenefitPlanServiceCost

11000000

USD

CY2018

us-gaap

Defined Benefit Plan Service Cost

DefinedBenefitPlanServiceCost

11000000

USD

CY2016

us-gaap

Defined Contribution Plan Employer Discretionary Contribution Amount

DefinedContributionPlanEmployerDiscretionaryContributionAmount

14000000

USD

CY2017

us-gaap

Defined Contribution Plan Employer Discretionary Contribution Amount

DefinedContributionPlanEmployerDiscretionaryContributionAmount

16000000

USD

CY2018

us-gaap

Defined Contribution Plan Employer Discretionary Contribution Amount

DefinedContributionPlanEmployerDiscretionaryContributionAmount

18000000

USD

CY2016

us-gaap

Depreciation

30000000

USD

CY2017

us-gaap

Depreciation

28000000

USD

CY2018

us-gaap

Depreciation

31000000

USD

CY2016

us-gaap

Depreciation Amortization And Accretion Net

DepreciationAmortizationAndAccretionNet

48000000

USD

CY2017

us-gaap

Depreciation Amortization And Accretion Net

DepreciationAmortizationAndAccretionNet

55000000

USD

CY2018

us-gaap

Depreciation Amortization And Accretion Net

DepreciationAmortizationAndAccretionNet

63000000

USD

CY2016

us-gaap

Direct Premiums Earned

DirectPremiumsEarned

4857000000

USD

CY2017

us-gaap

Direct Premiums Earned

DirectPremiumsEarned

5052000000

USD

CY2018

us-gaap

Direct Premiums Earned

DirectPremiumsEarned

5251000000

USD

CY2016

us-gaap

Dividends

475000000

USD

CY2017

us-gaap

Dividends

465000000

USD

CY2018

us-gaap

Dividends

500000000

USD

CY2016

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

3.59

CY2017Q1

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

1.22

CY2017Q2

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

0.61

CY2017Q3

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

0.62

CY2017Q4

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

3.92

CY2017

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

6.36

CY2018Q1

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

-0.19

CY2018Q2

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

1.33

CY2018Q3

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

3.40

CY2018Q4

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

-2.78

CY2018

us-gaap

Earnings Per Share Basic

EarningsPerShareBasic

1.76

CY2016

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

3.55

CY2017Q1

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

1.21

CY2017Q2

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

0.60

CY2017Q3

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

0.61

CY2017Q4

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

3.88

CY2017

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

6.29

CY2018Q1

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

-0.19

CY2018Q2

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

1.32

CY2018Q3

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

3.38

CY2018Q4

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

-2.78

CY2018

us-gaap

Earnings Per Share Diluted

EarningsPerShareDiluted

1.75

CY2016

us-gaap

Effective Income Tax Rate Continuing Operations

EffectiveIncomeTaxRateContinuingOperations

0.272

CY2017

us-gaap

Effective Income Tax Rate Continuing Operations

EffectiveIncomeTaxRateContinuingOperations

-0.432

CY2018

us-gaap

Effective Income Tax Rate Continuing Operations

EffectiveIncomeTaxRateContinuingOperations

-0.143

CY2016

us-gaap

Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate

EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate

0.35

CY2017

us-gaap

Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate

EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate

0.35

CY2018

us-gaap

Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate

EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate

0.21

CY2016

us-gaap

Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate

EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate

0.000

CY2017

us-gaap

Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate

EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate

-0.678

CY2018

us-gaap

Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate

EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate

0.000

CY2016

us-gaap

Effective Income Tax Rate Reconciliation Deductions Dividends

EffectiveIncomeTaxRateReconciliationDeductionsDividends

0.041

CY2017

us-gaap

Effective Income Tax Rate Reconciliation Deductions Dividends

EffectiveIncomeTaxRateReconciliationDeductionsDividends

0.047

CY2018

us-gaap

Effective Income Tax Rate Reconciliation Deductions Dividends

EffectiveIncomeTaxRateReconciliationDeductionsDividends

0.060

CY2016

us-gaap

Effective Income Tax Rate Reconciliation Other Adjustments

EffectiveIncomeTaxRateReconciliationOtherAdjustments

0.005

CY2017

us-gaap

Effective Income Tax Rate Reconciliation Other Adjustments

EffectiveIncomeTaxRateReconciliationOtherAdjustments

-0.008

CY2018

us-gaap

Effective Income Tax Rate Reconciliation Other Adjustments

EffectiveIncomeTaxRateReconciliationOtherAdjustments

-0.014

CY2016

us-gaap

Effective Income Tax Rate Reconciliation Tax Exempt Income

EffectiveIncomeTaxRateReconciliationTaxExemptIncome

0.042

CY2017

us-gaap

Effective Income Tax Rate Reconciliation Tax Exempt Income

EffectiveIncomeTaxRateReconciliationTaxExemptIncome

0.049

CY2018

us-gaap

Effective Income Tax Rate Reconciliation Tax Exempt Income

EffectiveIncomeTaxRateReconciliationTaxExemptIncome

0.080

CY2018Q4

us-gaap

Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized

EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

30000000

USD

CY2018

us-gaap

Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1

EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1

P1Y8M0D

CY2016

us-gaap

Employee Service Share Based Compensation Tax Benefit From Compensation Expense

EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense

8000000

USD

CY2017

us-gaap

Employee Service Share Based Compensation Tax Benefit From Compensation Expense

EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense

9000000

USD

CY2018

us-gaap

Employee Service Share Based Compensation Tax Benefit From Compensation Expense

EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense

5000000

USD

CY2016

us-gaap

Excess Tax Benefit From Share Based Compensation Financing Activities

ExcessTaxBenefitFromShareBasedCompensationFinancingActivities

5000000

USD

CY2017

us-gaap

Excess Tax Benefit From Share Based Compensation Financing Activities

ExcessTaxBenefitFromShareBasedCompensationFinancingActivities

0

USD

CY2018

us-gaap

Excess Tax Benefit From Share Based Compensation Financing Activities

ExcessTaxBenefitFromShareBasedCompensationFinancingActivities

0

USD

CY2017

us-gaap

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1

0

USD

CY2018

us-gaap

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1

0

USD

CY2017

us-gaap

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss

0

USD

CY2018

us-gaap

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss

1000000

USD

CY2017

us-gaap

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases

5000000

USD

CY2018

us-gaap

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases

0

USD

CY2017

us-gaap

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales

0

USD

CY2018

us-gaap

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales

0

USD

CY2017

us-gaap

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3

0

USD

CY2018

us-gaap

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3

0

USD

CY2017

us-gaap

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3

77000000

USD

CY2018

us-gaap

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3

0

USD

CY2016Q4

us-gaap

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue

78000000

USD

CY2017Q4

us-gaap

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue

6000000

USD

CY2018Q4

us-gaap

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value

FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue

5000000

USD

CY2016

us-gaap

Fees And Commissions

FeesAndCommissions

15000000

USD

CY2017

us-gaap

Fees And Commissions

FeesAndCommissions

16000000

USD

CY2018

us-gaap

Fees And Commissions

FeesAndCommissions

15000000

USD

CY2016

us-gaap

Gain Loss On Sale Of Investments

GainLossOnSaleOfInvestments

124000000

USD

CY2017

us-gaap

Gain Loss On Sale Of Investments

GainLossOnSaleOfInvestments

148000000

USD

CY2018

us-gaap

Gain Loss On Sale Of Investments

GainLossOnSaleOfInvestments

-408000000

USD

CY2016

us-gaap

Gross Investment Income Operating

GrossInvestmentIncomeOperating

604000000

USD

CY2017

us-gaap

Gross Investment Income Operating

GrossInvestmentIncomeOperating

619000000

USD

CY2018

us-gaap

Gross Investment Income Operating

GrossInvestmentIncomeOperating

631000000

USD

CY2016

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments