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Income Taxes (Components Of Deferred Tax Assets And Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Loss and loss expense reserves $ 197us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves $ 206us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves
Unearned premiums 145us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve 137us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve
Investments 16us-gaap_DeferredTaxAssetsInvestments 19us-gaap_DeferredTaxAssetsInvestments
Other 41us-gaap_DeferredTaxAssetsOther 46us-gaap_DeferredTaxAssetsOther
Total 399us-gaap_DeferredTaxAssetsNet 408us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Deferred tax liabilities: 937cinf_DeferredTaxLiabilitiesUnrealizedGainsAndLossesOnInvestments 807cinf_DeferredTaxLiabilitiesUnrealizedGainsAndLossesOnInvestments
Deferred acquisition costs 183us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost 178us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost
Life policy reserves 110cinf_DeferredTaxLiabilitiesPolicyLiabilitiesLife 86cinf_DeferredTaxLiabilitiesPolicyLiabilitiesLife
Other 9us-gaap_DeferredTaxLiabilitiesOther 10us-gaap_DeferredTaxLiabilitiesOther
Total 1,239us-gaap_DeferredTaxLiabilities 1,081us-gaap_DeferredTaxLiabilities
Net deferred income tax liability $ 840us-gaap_DeferredTaxAssetsLiabilitiesNet $ 673us-gaap_DeferredTaxAssetsLiabilitiesNet