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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
ASU 2018-12 |  |  |  |
Tax at statutory rate (percentage): | 21.00% | 21.00% | 21.00% |
Release of unrecognized tax benefits during the year |  | $ 34 |  |
Income tax refund received | $ 2 | 0 | $ 0 |
Net deferred tax assets, valuation allowance | 0 | 31 |  |
United States |  |  |  |
ASU 2018-12 |  |  |  |
Operating Loss Carryforwards | 0 | 0 |  |
Cincinnati Global |  |  |  |
ASU 2018-12 |  |  |  |
Net deferred tax assets, valuation allowance | 0 | 31 | $ 53 | $ 56
Cincinnati Global | United States |  |  |  |
ASU 2018-12 |  |  |  |
Operating Loss Carryforwards | 0 | 5 |  |
Cincinnati Global | United Kingdom |  |  |  |
ASU 2018-12 |  |  |  |
Operating Loss Carryforwards | $ 100 | $ 109 |  |

X
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