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Shareholders' Equity And Dividend Restrictions (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Declared cash dividends, per share $ 3.24 $ 3.00 $ 2.76
Dividend payment without prior regulatory approval, maximum percent of policyholder surplus 10.00%    
Dividend payment without prior regulatory approval, percent of statutory net income for the prior calendar year 100.00%    
Dividends might be paid during next year $ 1,245    
The Cincinnati Insurance Company      
Cash Dividends Paid to Parent 290 $ 526 $ 729
Cincinnati Global      
Cash Dividends Paid to Parent $ 0 $ 0 $ 0