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Life Policy And Investment Contract Reservess (Reserve In Addition To The Account Balance Based On Expected No-Lapse Guarantee Benefits And Expected Policy Assessments) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Liability for Future Policy Benefit, by Product Segment    
Life policy and investment contract reserves $ 2,497us-gaap_LiabilityForFuturePolicyBenefitsLife $ 2,390us-gaap_LiabilityForFuturePolicyBenefitsLife
Ordinary/Traditional Life    
Liability for Future Policy Benefit, by Product Segment    
Life policy and investment contract reserves 875us-gaap_LiabilityForFuturePolicyBenefitsLife
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= cinf_IndividualOrdinaryLifeInsuranceMember		 815us-gaap_LiabilityForFuturePolicyBenefitsLife
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= cinf_IndividualOrdinaryLifeInsuranceMember
Deferred Annuities    
Liability for Future Policy Benefit, by Product Segment    
Life policy and investment contract reserves 863us-gaap_LiabilityForFuturePolicyBenefitsLife
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= cinf_DeferredAnnuitiesMember		 862us-gaap_LiabilityForFuturePolicyBenefitsLife
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= cinf_DeferredAnnuitiesMember
Universal Life    
Liability for Future Policy Benefit, by Product Segment    
Life policy and investment contract reserves 530us-gaap_LiabilityForFuturePolicyBenefitsLife
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_UniversalLifeMember		 508us-gaap_LiabilityForFuturePolicyBenefitsLife
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_UniversalLifeMember
Structured Settlements    
Liability for Future Policy Benefit, by Product Segment    
Life policy and investment contract reserves 182us-gaap_LiabilityForFuturePolicyBenefitsLife
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= cinf_StructuredSettlementsMember		 189us-gaap_LiabilityForFuturePolicyBenefitsLife
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= cinf_StructuredSettlementsMember
Other    
Liability for Future Policy Benefit, by Product Segment    
Life policy and investment contract reserves $ 47us-gaap_LiabilityForFuturePolicyBenefitsLife
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= cinf_OtherLifeMember		 $ 16us-gaap_LiabilityForFuturePolicyBenefitsLife
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= cinf_OtherLifeMember