| **Fair Value Measurements (Fair Value Hierarchy For Assets Measured At Fair Value On A Recurring Basis) (Details) (USD $)In Millions, unless otherwise specified** | Dec. 31, 2014                                                                                                                                                                                                                                                                                                               | Dec. 31, 2013                                                                                                                                                                                                                                                                                                               |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | $ 9,460us-gaap_AvailableForSaleSecuritiesDebtSecurities                                                                                                                                                                                                                                                                     | $ 9,121us-gaap_AvailableForSaleSecuritiesDebtSecurities                                                                                                                                                                                                                                                                     |
| Available for sale securities, equity securities                                                                                                                   | 4,858us-gaap_AvailableForSaleSecuritiesEquitySecurities                                                                                                                                                                                                                                                                     | 4,375us-gaap_AvailableForSaleSecuritiesEquitySecurities                                                                                                                                                                                                                                                                     |
| Separate accounts taxable fixed maturities                                                                                                                         | 752us-gaap_SeparateAccountAssets                                                                                                                                                                                                                                                                                            | 692us-gaap_SeparateAccountAssets                                                                                                                                                                                                                                                                                            |
| Total                                                                                                                                                              | 15,067us-gaap_InvestmentsFairValueDisclosure                                                                                                                                                                                                                                                                                | 14,192us-gaap_InvestmentsFairValueDisclosure                                                                                                                                                                                                                                                                                |
| Top Hat Savings Plan - Mutual Funds and Common Equities                                                                                                            |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Top Hat Savings Plan - mutual funds and common equities (included in Other assets)                                                                                 | 18us-gaap_OtherInvestmentNotReadilyMarketableFairValue/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember                                                                                                                                     | 14us-gaap_OtherInvestmentNotReadilyMarketableFairValue/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember                                                                                                                                     |
| Fixed Maturities                                                                                                                                                   |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 9,460us-gaap_AvailableForSaleSecuritiesDebtSecurities/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember                                                                                                                                                                                                   | 9,121us-gaap_AvailableForSaleSecuritiesDebtSecurities/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember                                                                                                                                                                                                   |
| Fixed Maturities | Corporate Securities                                                                                                                            |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 5,526us-gaap_AvailableForSaleSecuritiesDebtSecurities/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CorporateBondSecuritiesMember                                                                                                           | 5,533us-gaap_AvailableForSaleSecuritiesDebtSecurities/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CorporateBondSecuritiesMember                                                                                                           |
| Fixed Maturities | States, Municipalities and Political Subdivisions                                                                                               |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 3,443us-gaap_AvailableForSaleSecuritiesDebtSecurities/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USStatesAndPoliticalSubdivisionsMember                                                                                                  | 3,211us-gaap_AvailableForSaleSecuritiesDebtSecurities/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USStatesAndPoliticalSubdivisionsMember                                                                                                  |
| Fixed Maturities | Commercial Mortgage Backed Securities                                                                                                           |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 259us-gaap_AvailableForSaleSecuritiesDebtSecurities/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommercialMortgageBackedSecuritiesMember                                                                                                  | 143us-gaap_AvailableForSaleSecuritiesDebtSecurities/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommercialMortgageBackedSecuritiesMember                                                                                                  |
| Fixed Maturities | Government-Sponsored Enterprises                                                                                                                |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 208us-gaap_AvailableForSaleSecuritiesDebtSecurities/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember                                                                                      | 200us-gaap_AvailableForSaleSecuritiesDebtSecurities/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember                                                                                      |
| Fixed Maturities | Foreign Government                                                                                                                              |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 10us-gaap_AvailableForSaleSecuritiesDebtSecurities/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= cinf_ForeignGovernmentMember                                                                                                                       | 10us-gaap_AvailableForSaleSecuritiesDebtSecurities/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= cinf_ForeignGovernmentMember                                                                                                                       |
| Fixed Maturities | Convertibles and Bonds with Warrants Attached                                                                                                   |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 7us-gaap_AvailableForSaleSecuritiesDebtSecurities/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_ConvertiblesAndBondsWithWarrantsAttachedMember                                                                                              | 17us-gaap_AvailableForSaleSecuritiesDebtSecurities/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_ConvertiblesAndBondsWithWarrantsAttachedMember                                                                                             |
| Fixed Maturities | United States Government                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 7us-gaap_AvailableForSaleSecuritiesDebtSecurities/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentAgenciesDebtSecuritiesMember                                                                                                    | 7us-gaap_AvailableForSaleSecuritiesDebtSecurities/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentAgenciesDebtSecuritiesMember                                                                                                    |
| Equity Securities | Common Equities                                                                                                                                |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, equity securities                                                                                                                   | 4,679us-gaap_AvailableForSaleSecuritiesEquitySecurities/ invest_InvestmentSecuritiesClassAxis= us-gaap_EquitySecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommonStockMember                                                                                                                   | 4,213us-gaap_AvailableForSaleSecuritiesEquitySecurities/ invest_InvestmentSecuritiesClassAxis= us-gaap_EquitySecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommonStockMember                                                                                                                   |
| Equity Securities | Nonredeemable Preferred Equities                                                                                                               |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, equity securities                                                                                                                   | 179us-gaap_AvailableForSaleSecuritiesEquitySecurities/ invest_InvestmentSecuritiesClassAxis= us-gaap_EquitySecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_PreferredStockMember                                                                                                                  | 162us-gaap_AvailableForSaleSecuritiesEquitySecurities/ invest_InvestmentSecuritiesClassAxis= us-gaap_EquitySecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_PreferredStockMember                                                                                                                  |
| Taxable Fixed Maturities                                                                                                                                           |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Separate accounts taxable fixed maturities                                                                                                                         | 731us-gaap_SeparateAccountAssets/ invest_InvestmentSecuritiesClassAxis= cinf_TaxableFixedMaturitiesMember                                                                                                                                                                                                                   | 682us-gaap_SeparateAccountAssets/ invest_InvestmentSecuritiesClassAxis= cinf_TaxableFixedMaturitiesMember                                                                                                                                                                                                                   |
| Level 1                                                                                                                                                            |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Total                                                                                                                                                              | 4,704us-gaap_InvestmentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                                                                                                                                                                                            | 4,234us-gaap_InvestmentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                                                                                                                                                                                            |
| Level 1 | Top Hat Savings Plan - Mutual Funds and Common Equities                                                                                                  |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Top Hat Savings Plan - mutual funds and common equities (included in Other assets)                                                                                 | 18us-gaap_OtherInvestmentNotReadilyMarketableFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember                                                | 14us-gaap_OtherInvestmentNotReadilyMarketableFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember                                                |
| Level 1 | Fixed Maturities                                                                                                                                         |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 7us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember                                                                                                                  | 7us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember                                                                                                                  |
| Level 1 | Fixed Maturities | Corporate Securities                                                                                                                  |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CorporateBondSecuritiesMember                          | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CorporateBondSecuritiesMember                          |
| Level 1 | Fixed Maturities | States, Municipalities and Political Subdivisions                                                                                     |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USStatesAndPoliticalSubdivisionsMember                 | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USStatesAndPoliticalSubdivisionsMember                 |
| Level 1 | Fixed Maturities | Commercial Mortgage Backed Securities                                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommercialMortgageBackedSecuritiesMember               | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommercialMortgageBackedSecuritiesMember               |
| Level 1 | Fixed Maturities | Government-Sponsored Enterprises                                                                                                      |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember   | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember   |
| Level 1 | Fixed Maturities | Foreign Government                                                                                                                    |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= cinf_ForeignGovernmentMember                                   | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= cinf_ForeignGovernmentMember                                   |
| Level 1 | Fixed Maturities | Convertibles and Bonds with Warrants Attached                                                                                         |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_ConvertiblesAndBondsWithWarrantsAttachedMember         | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_ConvertiblesAndBondsWithWarrantsAttachedMember         |
| Level 1 | Fixed Maturities | United States Government                                                                                                              |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 7us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentAgenciesDebtSecuritiesMember               | 7us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentAgenciesDebtSecuritiesMember               |
| Level 1 | Equity Securities | Common Equities                                                                                                                      |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, equity securities                                                                                                                   | 4,679us-gaap_AvailableForSaleSecuritiesEquitySecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_EquitySecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommonStockMember                              | 4,213us-gaap_AvailableForSaleSecuritiesEquitySecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_EquitySecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommonStockMember                              |
| Level 1 | Equity Securities | Nonredeemable Preferred Equities                                                                                                     |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, equity securities                                                                                                                   | 0us-gaap_AvailableForSaleSecuritiesEquitySecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_EquitySecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_PreferredStockMember                               | 0us-gaap_AvailableForSaleSecuritiesEquitySecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_EquitySecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_PreferredStockMember                               |
| Level 1 | Taxable Fixed Maturities                                                                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Separate accounts taxable fixed maturities                                                                                                                         | 0us-gaap_SeparateAccountAssets/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= cinf_TaxableFixedMaturitiesMember                                                                                                                                | 0us-gaap_SeparateAccountAssets/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member/ invest_InvestmentSecuritiesClassAxis= cinf_TaxableFixedMaturitiesMember                                                                                                                                |
| Level 2                                                                                                                                                            |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, equity securities                                                                                                                   |                                                                                                                                                                                                                                                                                                                        | 53us-gaap_AvailableForSaleSecuritiesEquitySecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                                                                                                                                                   |
| Total                                                                                                                                                              | 10,343us-gaap_InvestmentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                                                                                                                                                           | 9,954us-gaap_InvestmentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                                                                                                                                                                            |
| Level 2 | Top Hat Savings Plan - Mutual Funds and Common Equities                                                                                                  |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Top Hat Savings Plan - mutual funds and common equities (included in Other assets)                                                                                 | 0us-gaap_OtherInvestmentNotReadilyMarketableFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember                                                 | 0us-gaap_OtherInvestmentNotReadilyMarketableFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember                                                 |
| Level 2 | Fixed Maturities                                                                                                                                         |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 9,435us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember                                                                                                              | 9,112us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember                                                                                                              |
| Level 2 | Fixed Maturities | Corporate Securities                                                                                                                  |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 5,508us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CorporateBondSecuritiesMember                      | 5,531us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CorporateBondSecuritiesMember                      |
| Level 2 | Fixed Maturities | States, Municipalities and Political Subdivisions                                                                                     |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 3,443us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USStatesAndPoliticalSubdivisionsMember             | 3,211us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USStatesAndPoliticalSubdivisionsMember             |
| Level 2 | Fixed Maturities | Commercial Mortgage Backed Securities                                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 259us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommercialMortgageBackedSecuritiesMember             | 143us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommercialMortgageBackedSecuritiesMember             |
| Level 2 | Fixed Maturities | Government-Sponsored Enterprises                                                                                                      |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 208us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 200us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember |
| Level 2 | Fixed Maturities | Foreign Government                                                                                                                    |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 10us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= cinf_ForeignGovernmentMember                                  | 10us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= cinf_ForeignGovernmentMember                                  |
| Level 2 | Fixed Maturities | Convertibles and Bonds with Warrants Attached                                                                                         |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 7us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_ConvertiblesAndBondsWithWarrantsAttachedMember         | 17us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_ConvertiblesAndBondsWithWarrantsAttachedMember        |
| Level 2 | Fixed Maturities | United States Government                                                                                                              |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentAgenciesDebtSecuritiesMember               | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentAgenciesDebtSecuritiesMember               |
| Level 2 | Equity Securities | Common Equities                                                                                                                      |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, equity securities                                                                                                                   | 0us-gaap_AvailableForSaleSecuritiesEquitySecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_EquitySecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommonStockMember                                  | 0us-gaap_AvailableForSaleSecuritiesEquitySecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_EquitySecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommonStockMember                                  |
| Level 2 | Equity Securities | Nonredeemable Preferred Equities                                                                                                     |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, equity securities                                                                                                                   | 177us-gaap_AvailableForSaleSecuritiesEquitySecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_EquitySecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_PreferredStockMember                             | 160us-gaap_AvailableForSaleSecuritiesEquitySecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_EquitySecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_PreferredStockMember                             |
| Level 2 | Taxable Fixed Maturities                                                                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Separate accounts taxable fixed maturities                                                                                                                         | 731us-gaap_SeparateAccountAssets/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= cinf_TaxableFixedMaturitiesMember                                                                                                                              | 682us-gaap_SeparateAccountAssets/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member/ invest_InvestmentSecuritiesClassAxis= cinf_TaxableFixedMaturitiesMember                                                                                                                              |
| Level 3                                                                                                                                                            |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, equity securities                                                                                                                   |                                                                                                                                                                                                                                                                                                                        | 0us-gaap_AvailableForSaleSecuritiesEquitySecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                                                                                                                                                                                    |
| Total                                                                                                                                                              | 20us-gaap_InvestmentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                                                                                                                                                                                               | 4us-gaap_InvestmentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                                                                                                                                                                                                |
| Level 3 | Top Hat Savings Plan - Mutual Funds and Common Equities                                                                                                  |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Top Hat Savings Plan - mutual funds and common equities (included in Other assets)                                                                                 | 0us-gaap_OtherInvestmentNotReadilyMarketableFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember                                                 | 0us-gaap_OtherInvestmentNotReadilyMarketableFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember                                                 |
| Level 3 | Fixed Maturities                                                                                                                                         |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 18us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember                                                                                                                 | 2us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember                                                                                                                  |
| Level 3 | Fixed Maturities | Corporate Securities                                                                                                                  |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 18us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CorporateBondSecuritiesMember                         | 2us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CorporateBondSecuritiesMember                          |
| Level 3 | Fixed Maturities | States, Municipalities and Political Subdivisions                                                                                     |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USStatesAndPoliticalSubdivisionsMember                 | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USStatesAndPoliticalSubdivisionsMember                 |
| Level 3 | Fixed Maturities | Commercial Mortgage Backed Securities                                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommercialMortgageBackedSecuritiesMember               | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommercialMortgageBackedSecuritiesMember               |
| Level 3 | Fixed Maturities | Government-Sponsored Enterprises                                                                                                      |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember   | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember   |
| Level 3 | Fixed Maturities | Foreign Government                                                                                                                    |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= cinf_ForeignGovernmentMember                                   | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= cinf_ForeignGovernmentMember                                   |
| Level 3 | Fixed Maturities | Convertibles and Bonds with Warrants Attached                                                                                         |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_ConvertiblesAndBondsWithWarrantsAttachedMember         | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_ConvertiblesAndBondsWithWarrantsAttachedMember         |
| Level 3 | Fixed Maturities | United States Government                                                                                                              |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, debt securities                                                                                                                     | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentAgenciesDebtSecuritiesMember               | 0us-gaap_AvailableForSaleSecuritiesDebtSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_DebtSecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_USGovernmentAgenciesDebtSecuritiesMember               |
| Level 3 | Equity Securities | Common Equities                                                                                                                      |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, equity securities                                                                                                                   | 0us-gaap_AvailableForSaleSecuritiesEquitySecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_EquitySecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommonStockMember                                  | 0us-gaap_AvailableForSaleSecuritiesEquitySecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_EquitySecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_CommonStockMember                                  |
| Level 3 | Equity Securities | Nonredeemable Preferred Equities                                                                                                     |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Available for sale securities, equity securities                                                                                                                   | 2us-gaap_AvailableForSaleSecuritiesEquitySecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_EquitySecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_PreferredStockMember                               | 2us-gaap_AvailableForSaleSecuritiesEquitySecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= us-gaap_EquitySecuritiesMember/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_PreferredStockMember                               |
| Level 3 | Taxable Fixed Maturities                                                                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis**                                                                                 |                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                        |
| Separate accounts taxable fixed maturities                                                                                                                         | $ 0us-gaap_SeparateAccountAssets/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= cinf_TaxableFixedMaturitiesMember                                                                                                                              | $ 0us-gaap_SeparateAccountAssets/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member/ invest_InvestmentSecuritiesClassAxis= cinf_TaxableFixedMaturitiesMember                                                                                                                              |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of debt securities categorized neither as held-to-maturity nor trading.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803
+ Details**Name:**us-gaap_AvailableForSaleSecuritiesDebtSecurities**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of equity securities categorized neither as held-to-maturity nor as trading.
+ References
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| - Definition
Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.
+ References
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| - Definition
Value of the other investment not readily marketable determined by management based upon fair value methods, including pricing of similar securities and valuation techniques, that was used to record the investment for financial reporting purposes.
+ References
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| - Definition
The fair value of the assets held by the Entity for the benefit of separate account policyholders.
+ References
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