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Reinsurance (Tables) | 12 Months Ended
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Dec. 31, 2024
Insurance [Abstract] |
Reinsurance Recoverable, Credit Quality Indicator |
Reinsurance Recoverables by Credit Quality Indicator
| As of December 31, 2024 |  | As of December 31, 2023
| P&C | Employee Benefits | Corporate | Total |  | P&C | Employee Benefits | Corporate | Total
AM Best Financial Strength Rating |  |  |  |  |  |  |  |  |
A++ | $ | 2,271 |  | $ | — |  | $ | — |  | $ | 2,271 |  |  | $ | 2,398 |  | $ | — |  | $ | — |  | $ | 2,398 |
A+ | 2,169 |  | 281 |  | 224 |  | 2,674 |  |  | 2,030 |  | 251 |  | 241 |  | 2,522 |
A | 829 |  | 1 |  | — |  | 830 |  |  | 810 |  | 1 |  | — |  | 811 |
A- | 622 |  | 4 |  | — |  | 626 |  |  | 653 |  | 5 |  | — |  | 658 |
B++ | 2 |  | — |  | 2 |  | 4 |  |  | 2 |  | — |  | 3 |  | 5 |
Below B++ | 22 |  | — |  | — |  | 22 |  |  | 22 |  | — |  | — |  | 22 |
Total Rated by AM Best | 5,915 |  | 286 |  | 226 |  | 6,427 |  |  | 5,915 |  | 257 |  | 244 |  | 6,416 |
Mandatory (Assigned) and Voluntary Risk Pools | 205 |  | — |  | — |  | 205 |  |  | 208 |  | — |  | — |  | 208 |
Captives | 402 |  | — |  | — |  | 402 |  |  | 353 |  | — |  | — |  | 353 |
Other not rated companies | 176 |  | 5 |  | — |  | 181 |  |  | 226 |  | 4 |  | — |  | 230 |
Gross Reinsurance Recoverables | 6,698 |  | 291 |  | 226 |  | 7,215 |  |  | 6,702 |  | 261 |  | 244 |  | 7,207 |
Allowance for uncollectible reinsurance | (72) |  | (1) |  | (2) |  | (75) |  |  | (100) |  | (1) |  | (2) |  | (103) |
Net Reinsurance Recoverables | $ | 6,626 |  | $ | 290 |  | $ | 224 |  | $ | 7,140 |  |  | $ | 6,602 |  | $ | 260 |  | $ | 242 |  | $ | 7,104 |
Reinsurance Recoverable, Allowance for Credit Loss |
Allowance for Uncollectible Reinsurance
| As of December 31, 2024 |  | As of December 31, 2023 |  | As of December 31, 2022
P&C beginning allowance for uncollectible reinsurance | $ | 100 |  |  | $ | 102 |  |  | $ | 96 |
Beginning allowance for disputed amounts | 57 |  |  | 60 |  |  | 54 |
P&C beginning ACL | 43 |  |  | 42 |  |  | 42 |
Current period provision | (6) |  |  | 3 |  |  | — |
Current period gross write-offs | (13) |  |  | (2) |  |  | — |
P&C ending ACL | 24 |  |  | 43 |  |  | 42 |
Ending allowance for disputed amounts | 48 |  |  | 57 |  |  | 60 |
P&C ending allowance for uncollectible reinsurance | 72 |  |  | 100 |  |  | 102 |
Employee Benefits allowance for uncollectible reinsurance | 1 |  |  | 1 |  |  | 1 |
Corporate allowance for uncollectible reinsurance | 2 |  |  | 2 |  |  | 2 |
Total allowance for uncollectible reinsurance | $ | 75 |  |  | $ | 103 |  |  | $ | 105 |
Property and Casualty Insurance and Group Benefits Revenue | Insurance Revenues Property and Casualty Insurance Revenue
| For the years ended December 31, |
Premiums Written | 2024 | 2023 | 2022 |
Direct | $ | 17,622 |  | $ | 16,144 |  | $ | 14,891 |  |
Assumed | 1,102 |  | 975 |  | 718 |  |
Ceded | (1,775) |  | (1,642) |  | (1,490) |  |
Net | $ | 16,949 |  | $ | 15,477 |  | $ | 14,119 |  |
Premiums Earned |  |  |  |
Direct | $ | 16,915 |  | $ | 15,514 |  | $ | 14,328 |  |
Assumed | 1,001 |  | 826 |  | 654 |  |
Ceded | (1,742) |  | (1,612) |  | (1,462) |  |
Net | $ | 16,174 |  | $ | 14,728 |  | $ | 13,520 |  |
Employee Benefits Revenue
| For the years ended December 31,
| 2024 | 2023 | 2022
Gross earned premiums, fees and other considerations | $ | 6,576 |  | $ | 6,445 |  | $ | 5,988 |
Reinsurance assumed | 166 |  | 174 |  | 175 |
Reinsurance ceded | (127) |  | (104) |  | (106) |
Net earned premiums, fees and other considerations | $ | 6,615 |  | $ | 6,515 |  | $ | 6,057 |

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- Definition Tabular disclosure of the effects of reinsurance, for example, but not limited to, disclosure of direct, assumed, and ceded insurance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 605 -Topic 944 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479032/944-605-50-1 + Details
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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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