| **Condensed Financial Statements Of Parent Company Condensed Statements Of Income (Details) (USD $)In Millions, unless otherwise specified** | 3 Months Ended                                                                                                         | 12 Months Ended                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------|
||
| **Revenues**                                                                                                                                 |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   |   |   |   |
| Investment income, net of expenses                                                                                                           |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   | $ 549us-gaap_NetInvestmentIncome | $ 529us-gaap_NetInvestmentIncome | $ 531us-gaap_NetInvestmentIncome |
| Realized investment gains, net                                                                                                               |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   | 133us-gaap_RealizedInvestmentGainsLosses | 83us-gaap_RealizedInvestmentGainsLosses | 42us-gaap_RealizedInvestmentGainsLosses |
| Other revenues                                                                                                                               |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   | 8us-gaap_OtherIncome | 9us-gaap_OtherIncome | 10us-gaap_OtherIncome |
| Total revenues                                                                                                                               | 1,262us-gaap_Revenues                                                                                                  | 1,280us-gaap_Revenues                                                                                                  | 1,214us-gaap_Revenues | 1,189us-gaap_Revenues | 1,172us-gaap_Revenues | 1,152us-gaap_Revenues | 1,104us-gaap_Revenues | 1,103us-gaap_Revenues | 4,945us-gaap_Revenues | 4,531us-gaap_Revenues | 4,111us-gaap_Revenues |
| **Expenses**                                                                                                                                 |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   |   |   |   |
| Interest expense                                                                                                                             |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   | 53us-gaap_InterestExpense | 54us-gaap_InterestExpense | 54us-gaap_InterestExpense |
| Other expenses                                                                                                                               |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   | 14us-gaap_OtherCostAndExpenseOperating | 15us-gaap_OtherCostAndExpenseOperating | 14us-gaap_OtherCostAndExpenseOperating |
| Total expenses                                                                                                                               |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   | 4,224us-gaap_BenefitsLossesAndExpenses | 3,817us-gaap_BenefitsLossesAndExpenses | 3,545us-gaap_BenefitsLossesAndExpenses |
| Income (Loss) Before Income Taxes and Earnings of Subsidiaries                                                                               | 236us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 259us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 107us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 119us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 167us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 182us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 148us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 217us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 721us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 714us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 566us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
| Benefit for income taxes                                                                                                                     |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   | 196us-gaap_IncomeTaxExpenseBenefit | 197us-gaap_IncomeTaxExpenseBenefit | 145us-gaap_IncomeTaxExpenseBenefit |
| Net Income                                                                                                                                   | 167us-gaap_NetIncomeLoss                                                                                               | 183us-gaap_NetIncomeLoss                                                                                               | 84us-gaap_NetIncomeLoss | 91us-gaap_NetIncomeLoss | 122us-gaap_NetIncomeLoss | 131us-gaap_NetIncomeLoss | 110us-gaap_NetIncomeLoss | 154us-gaap_NetIncomeLoss | 525us-gaap_NetIncomeLoss | 517us-gaap_NetIncomeLoss | 421us-gaap_NetIncomeLoss |
| Cincinnati Financial Corporation                                                                                                             |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   |   |   |   |
| **Revenues**                                                                                                                                 |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   |   |   |   |
| Investment income, net of expenses                                                                                                           |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   | 46us-gaap_NetInvestmentIncome/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 41us-gaap_NetInvestmentIncome/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 42us-gaap_NetInvestmentIncome/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Realized investment gains, net                                                                                                               |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   | 34us-gaap_RealizedInvestmentGainsLosses/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 21us-gaap_RealizedInvestmentGainsLosses/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 34us-gaap_RealizedInvestmentGainsLosses/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Other revenues                                                                                                                               |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   | 16us-gaap_OtherIncome/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 15us-gaap_OtherIncome/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 15us-gaap_OtherIncome/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Total revenues                                                                                                                               |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   | 96us-gaap_Revenues/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 77us-gaap_Revenues/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 91us-gaap_Revenues/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| **Expenses**                                                                                                                                 |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   |   |   |   |
| Interest expense                                                                                                                             |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   | 52us-gaap_InterestExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 53us-gaap_InterestExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 53us-gaap_InterestExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Other expenses                                                                                                                               |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   | 28us-gaap_OtherCostAndExpenseOperating/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 29us-gaap_OtherCostAndExpenseOperating/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 27us-gaap_OtherCostAndExpenseOperating/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Total expenses                                                                                                                               |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   | 80us-gaap_BenefitsLossesAndExpenses/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 82us-gaap_BenefitsLossesAndExpenses/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 80us-gaap_BenefitsLossesAndExpenses/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Income (Loss) Before Income Taxes and Earnings of Subsidiaries                                                                               |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   | 16us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | (5)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 11us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Benefit for income taxes                                                                                                                     |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   | (5)us-gaap_IncomeTaxExpenseBenefit/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | (11)us-gaap_IncomeTaxExpenseBenefit/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | (4)us-gaap_IncomeTaxExpenseBenefit/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Net Income Before Earnings of Subsidiaries                                                                                                   |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   | 21cinf_IncomeLossBeforeEquityMethodInvestments/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 6cinf_IncomeLossBeforeEquityMethodInvestments/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 15cinf_IncomeLossBeforeEquityMethodInvestments/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Increase in equity of subsidiaries                                                                                                           |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   | 504cinf_IncreaseDecreaseInEquityOfSubsidiaries/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 511cinf_IncreaseDecreaseInEquityOfSubsidiaries/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 406cinf_IncreaseDecreaseInEquityOfSubsidiaries/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Net Income                                                                                                                                   |                                                                                                                   |                                                                                                                   |   |   |   |   |   |   | $ 525us-gaap_NetIncomeLoss/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | $ 517us-gaap_NetIncomeLoss/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | $ 421us-gaap_NetIncomeLoss/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |

| X                                                                                                                                                                                                                                                                           |
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Income Loss Before Equity Method Investments
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Increase or decrease in equity subsidiaries.
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| - Definition
The total amount of expense recognized during the period for future policy benefits, claims and claims adjustment costs, and for selling, general and administrative costs.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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| - Definition
Amount of the cost of borrowed funds accounted for as interest expense.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.
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| - Definition
The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.
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| - Definition
Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement.
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| - Definition
The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).
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