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Reinsurance (Tables) | 3 Months Ended
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Mar. 31, 2024
Reinsurance Disclosures [Abstract] |
Reinsurance Recoverable, Credit Quality Indicator [Table Text Block] |
Reinsurance Recoverables by Credit Quality Indicator
| As of March 31, 2024 |  | As of December 31, 2023
| P&C | Group Benefits | Corporate | Total |  | P&C | Group Benefits | Corporate | Total
A.M. Best Financial Strength Rating |  |  |  |  |  |  |  |  |
A++ | $ | 2,394 |  | $ | — |  | $ | — |  | $ | 2,394 |  |  | $ | 2,398 |  | $ | — |  | $ | — |  | $ | 2,398 |
A+ | 2,034 |  | 250 |  | 243 |  | 2,527 |  |  | 2,030 |  | 251 |  | 241 |  | 2,522 |
A | 787 |  | 1 |  | — |  | 788 |  |  | 810 |  | 1 |  | — |  | 811 |
A- | 647 |  | 5 |  | — |  | 652 |  |  | 653 |  | 5 |  | — |  | 658 |
B++ | 4 |  | — |  | 3 |  | 7 |  |  | 2 |  | — |  | 3 |  | 5 |
Below B++ | 22 |  | — |  | — |  | 22 |  |  | 22 |  | — |  | — |  | 22 |
Total Rated by A.M. Best | 5,888 |  | 256 |  | 246 |  | 6,390 |  |  | 5,915 |  | 257 |  | 244 |  | 6,416 |
Mandatory (Assigned) and Voluntary Risk Pools | 203 |  | — |  | — |  | 203 |  |  | 208 |  | — |  | — |  | 208 |
Captives | 353 |  | — |  | — |  | 353 |  |  | 353 |  | — |  | — |  | 353 |
Other not rated companies | 243 |  | 6 |  | — |  | 249 |  |  | 226 |  | 4 |  | — |  | 230 |
Gross Reinsurance Recoverables | 6,687 |  | 262 |  | 246 |  | 7,195 |  |  | 6,702 |  | 261 |  | 244 |  | 7,207 |
Allowance for uncollectible reinsurance | (98) |  | (1) |  | (2) |  | (101) |  |  | (100) |  | (1) |  | (2) |  | (103) |
Net Reinsurance Recoverables | $ | 6,589 |  | $ | 261 |  | $ | 244 |  | $ | 7,094 |  |  | $ | 6,602 |  | $ | 260 |  | $ | 242 |  | $ | 7,104 |
Reinsurance Recoverable, Allowance for Credit Loss [Table Text Block] |
| Allowance for Uncollectible Reinsurance for the Three Months Ended
|  |  |  | Three Months Ended March 31,
|  |  |  |  | 2024 | 2023
| P&C beginning allowance for uncollectible reinsurance |  |  |  | $ | 100 |  | $ | 102 |
| Beginning allowance for disputed amounts |  |  |  | 57 |  | 60 |
| P&C beginning ACL |  |  |  | 43 |  | 42 |
| Current period provision |  |  |  | 1 |  | 2 |
| P&C ending ACL |  |  |  | 44 |  | 44 |
| Ending allowance for disputed amounts |  |  |  | 54 |  | 58 |
| P&C ending allowance for uncollectible reinsurance |  |  |  | 98 |  | 102 |
| Group Benefits allowance for uncollectible reinsurance |  |  |  | 1 |  | 1 |
| Corporate allowance for uncollectible reinsurance |  |  |  | 2 |  | 2 |
| Total allowance for uncollectible reinsurance |  |  |  | $ | 101 |  | $ | 105 |

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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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