| **Consolidated Statements Of Income (USD $)In Millions, except Per Share data, unless otherwise specified** | 12 Months Ended                                                                                                        |
|-------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------|
||
| **Revenues**                                                                                                |                                                                                                                   |   |   |
| Earned premiums                                                                                             | $ 4,243us-gaap_PremiumsEarnedNet                                                                                       | $ 3,902us-gaap_PremiumsEarnedNet | $ 3,522us-gaap_PremiumsEarnedNet |
| 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 |
| Fee revenues                                                                                                | 12us-gaap_FeesAndCommissions                                                                                           | 8us-gaap_FeesAndCommissions | 6us-gaap_FeesAndCommissions |
| Other revenues                                                                                              | 8us-gaap_OtherIncome                                                                                                   | 9us-gaap_OtherIncome | 10us-gaap_OtherIncome |
| Total revenues                                                                                              | 4,945us-gaap_Revenues                                                                                                  | 4,531us-gaap_Revenues | 4,111us-gaap_Revenues |
| **Benefits and Expenses**                                                                                   |                                                                                                                   |   |   |
| Insurance losses and policyholder benefits                                                                  | 2,856us-gaap_PolicyholderBenefitsAndClaimsIncurredNet                                                                  | 2,505us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | 2,322us-gaap_PolicyholderBenefitsAndClaimsIncurredNet |
| Underwriting, acquisition and insurance expenses                                                            | 1,301cinf_UnderwritingAcquisitionAndInsuranceExpenses                                                                  | 1,243cinf_UnderwritingAcquisitionAndInsuranceExpenses | 1,155cinf_UnderwritingAcquisitionAndInsuranceExpenses |
| Interest expense                                                                                            | 53us-gaap_InterestExpense                                                                                              | 54us-gaap_InterestExpense | 54us-gaap_InterestExpense |
| Other operating expenses                                                                                    | 14us-gaap_OtherCostAndExpenseOperating                                                                                 | 15us-gaap_OtherCostAndExpenseOperating | 14us-gaap_OtherCostAndExpenseOperating |
| Total benefits and expenses                                                                                 | 4,224us-gaap_BenefitsLossesAndExpenses                                                                                 | 3,817us-gaap_BenefitsLossesAndExpenses | 3,545us-gaap_BenefitsLossesAndExpenses |
| Income Before Income Taxes                                                                                  | 721us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 714us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 566us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
| **Provision for Income Taxes**                                                                              |                                                                                                                   |   |   |
| Current                                                                                                     | 159us-gaap_CurrentIncomeTaxExpenseBenefit                                                                              | 178us-gaap_CurrentIncomeTaxExpenseBenefit | 119us-gaap_CurrentIncomeTaxExpenseBenefit |
| Deferred                                                                                                    | 37us-gaap_DeferredIncomeTaxExpenseBenefit                                                                              | 19us-gaap_DeferredIncomeTaxExpenseBenefit | 26us-gaap_DeferredIncomeTaxExpenseBenefit |
| Total provision for income taxes                                                                            | 196us-gaap_IncomeTaxExpenseBenefit                                                                                     | 197us-gaap_IncomeTaxExpenseBenefit | 145us-gaap_IncomeTaxExpenseBenefit |
| Net Income                                                                                                  | $ 525us-gaap_NetIncomeLoss                                                                                             | $ 517us-gaap_NetIncomeLoss | $ 421us-gaap_NetIncomeLoss |
| **Per Common Share**                                                                                        |                                                                                                                   |   |   |
| Net income—basic (in usd per share)                                                                  | $ 3.21us-gaap_EarningsPerShareBasic                                                                                    | $ 3.16us-gaap_EarningsPerShareBasic | $ 2.59us-gaap_EarningsPerShareBasic |
| Net income—diluted (in usd per share)                                                                | $ 3.18us-gaap_EarningsPerShareDiluted                                                                                  | $ 3.12us-gaap_EarningsPerShareDiluted | $ 2.57us-gaap_EarningsPerShareDiluted |

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Amount of commissions, insurance operating expenses, increase in deferred acquisition costs and taxes, licenses and fees.
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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
Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.
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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.
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| - Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.
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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.
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| - Definition
Amount of fees and commissions from financial services and banking activities and correspondent clearing. Includes fees from depositor accounts, credit cards, merchant discounts, and fiduciary and trust activities, guarantee fees, investment advisory, management, and administrative fees, transfer agent fees, and insurance commissions.
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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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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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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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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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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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Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred.
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| - Definition
Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.
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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.
+ References
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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).
+ References
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