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Condensed Financial Statements Of Parent Company Condensed Balance Sheets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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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

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