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Reinsurance and Indemnification - Florida Hurricane Catastrophe Fund (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2025 USD ($) contract | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Reinsurance Retention Policy [Line Items] |  |  |
Property-liability insurance premiums earned | $ 2,681 | $ 2,260 | $ 2,036
Florida Hurricane Catastrophe Fund |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Property-liability insurance premiums earned | 18 | 23 | 28
Reinsurance recoverable, qualifying losses (recoveries), amount | $ (28) | (1) | $ (6)
Contracts number | contract | 3 |  |
Retention level for losses related to hurricanes | $ 173 |  |
Percent of losses in excess of retention level to be reimbursed (as a percent) | 90.00% |  |
Maximum retention level for losses related to hurricanes | $ 97 |  |
Retention level for losses related to other hurricanes | 51 |  |
Reinsurance and indemnification recoverables, net | $ 29 | $ 73 |
Florida Hurricane Catastrophe Fund | National General Lender Services Standalone Program |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Contracts number | contract | 1 |  |
Florida Hurricane Catastrophe Fund |  |  |
Reinsurance Retention Policy [Line Items] |  |  |
Emergency assessment maximum percentage of premiums first year (as a percent) | 6.00% |  |
Emergency assessment maximum percentage of premiums subsequent years (as a percent) | 10.00% |  |

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- Definition The maximum emergency assessment as a premium of all eligible property and casualty premiums in the state, for the payment of bonds issued to provide reimbursements for losses related to mandatory coverage, in the first year that such bonding is required. + References No definition available. + Details
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- Definition The maximum emergency assessment as a premium of all eligible property and casualty premiums in the state, for the payment of bonds issued to provide reimbursements for losses related to mandatory coverage, in the second and subsequent years that such bonding is required. + References No definition available. + Details
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- Definition The entity's maximum retention level for personal property losses related to catastrophes related to largest identified and others. + References No definition available. + Details
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