Condensed Financial Statements Of Parent Company Condensed Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Condensed Financial Statements, Captions
Equity securities, cost	$ 4,282	$ 4,294
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	337	322
Cincinnati Financial Corporation
Condensed Financial Statements, Captions
Amortized cost of fixed maturities	184	91
Equity securities, cost	1,645	1,734
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 164	$ 156

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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