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v3.25.1

Reinsurance (Tables) | 3 Months Ended
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Mar. 31, 2025
Reinsurance Disclosures [Abstract] |
Reinsurance Recoverable, Credit Quality Indicator [Table Text Block] |
Reinsurance Recoverables by Credit Quality Indicator
| As of March 31, 2025 |  | As of December 31, 2024
| P&C | Employee Benefits | Corporate | Total |  | P&C | Employee Benefits | Corporate | Total
A.M. Best Financial Strength Rating |  |  |  |  |  |  |  |  |
A++ | $ | 2,250 |  | $ | — |  | $ | — |  | $ | 2,250 |  |  | $ | 2,271 |  | $ | — |  | $ | — |  | $ | 2,271 |
A+ | 2,188 |  | 286 |  | 220 |  | 2,694 |  |  | 2,169 |  | 281 |  | 224 |  | 2,674 |
A | 838 |  | 1 |  | — |  | 839 |  |  | 829 |  | 1 |  | — |  | 830 |
A- | 619 |  | 4 |  | — |  | 623 |  |  | 622 |  | 4 |  | — |  | 626 |
B++ | 2 |  | — |  | 2 |  | 4 |  |  | 2 |  | — |  | 2 |  | 4 |
Below B++ | 22 |  | — |  | — |  | 22 |  |  | 22 |  | — |  | — |  | 22 |
Total Rated by A.M. Best | 5,919 |  | 291 |  | 222 |  | 6,432 |  |  | 5,915 |  | 286 |  | 226 |  | 6,427 |
Mandatory (Assigned) and Voluntary Risk Pools | 208 |  | — |  | — |  | 208 |  |  | 205 |  | — |  | — |  | 205 |
Captives | 419 |  | — |  | — |  | 419 |  |  | 402 |  | — |  | — |  | 402 |
Other not rated companies | 195 |  | 6 |  | — |  | 201 |  |  | 176 |  | 5 |  | — |  | 181 |
Gross Reinsurance Recoverables | 6,741 |  | 297 |  | 222 |  | 7,260 |  |  | 6,698 |  | 291 |  | 226 |  | 7,215 |
Allowance for uncollectible reinsurance | (72) |  | (1) |  | (2) |  | (75) |  |  | (72) |  | (1) |  | (2) |  | (75) |
Net Reinsurance Recoverables | $ | 6,669 |  | $ | 296 |  | $ | 220 |  | $ | 7,185 |  |  | $ | 6,626 |  | $ | 290 |  | $ | 224 |  | $ | 7,140 |
Reinsurance Recoverable, Allowance for Credit Loss [Table Text Block] |
Allowance for Uncollectible Reinsurance for the Three Months Ended
|  |  | Three Months Ended March 31,
|  |  |  | 2025 | 2024
P&C beginning allowance for uncollectible reinsurance |  |  |  | $ | 72 |  | $ | 100 |
Beginning allowance for disputed amounts |  |  |  | 48 |  | 57 |
P&C beginning ACL |  |  |  | 24 |  | 43 |
Current period provision (release) |  |  |  | (4) |  | 1 |
P&C ending ACL |  |  |  | 20 |  | 44 |
Ending allowance for disputed amounts |  |  |  | 52 |  | 54 |
P&C ending allowance for uncollectible reinsurance |  |  |  | 72 |  | 98 |
Employee Benefits allowance for uncollectible reinsurance |  |  |  | 1 |  | 1 |
Corporate allowance for uncollectible reinsurance |  |  |  | 2 |  | 2 |
Total allowance for uncollectible reinsurance |  |  |  | $ | 75 |  | $ | 101 |

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- Definition Tabular disclosure of allowance for credit loss on reinsurance recoverable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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- Definition Tabular disclosure of credit quality indicator for reinsurance recoverable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
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