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Premiums Receivable (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
Credit Loss [Abstract] |
Premium Receivable, Allowance for Credit Loss [Table Text Block] |
Premiums Receivable and Agents' Balances
| As of December 31,
| 2024 | 2023
Premiums receivable, excluding receivables for losses within a deductible and retrospectively-rated policy premiums ("loss sensitive business") | $ | 5,624 |  | $ | 5,303 |
Receivables for loss sensitive business, by credit quality: |  |
AA | 97 |  | 94 |
A | 57 |  | 54 |
BBB | 193 |  | 136 |
BB | 94 |  | 84 |
Below BB | 50 |  | 45 |
Total receivables for loss sensitive business | 491 |  | 413 |
Total Premiums Receivable and Agents' Balances, Gross | 6,115 |  | 5,716 |
ACL | (117) |  | (109) |
Total Premiums Receivable and Agents' Balances, Net of ACL | $ | 5,998 |  | $ | 5,607 |
Rollforward of ACL on Premiums Receivable and Agents' Balances for the Year Ended
| December 31, 2024 |  | December 31, 2023 |  | December 31, 2022
| Receivables Excluding Receivables for Loss Sensitive Business | Receivables for Loss Sensitive Business | Total |  | Receivables Excluding Receivables for Loss Sensitive Business | Receivables for Loss Sensitive Business | Total |  | Receivables Excluding Receivables for Loss Sensitive Business | Receivables for Loss Sensitive Business | Total
Beginning ACL | $ | 89 |  | $ | 20 |  | $ | 109 |  |  | $ | 85 |  | $ | 24 |  | $ | 109 |  |  | $ | 83 |  | $ | 22 |  | $ | 105 |
Current period provision (release) | 64 |  | 1 |  | 65 |  |  | 52 |  | (2) |  | 50 |  |  | 48 |  | 3 |  | 51 |
Current period gross write-offs | (62) |  | (1) |  | (63) |  |  | (55) |  | (2) |  | (57) |  |  | (56) |  | (1) |  | (57) |
Current period gross recoveries | 6 |  | — |  | 6 |  |  | 7 |  | — |  | 7 |  |  | 10 |  | — |  | 10 |
Ending ACL | $ | 97 |  | $ | 20 |  | $ | 117 |  |  | $ | 89 |  | $ | 20 |  | $ | 109 |  |  | $ | 85 |  | $ | 24 |  | $ | 109 |

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- Definition Tabular disclosure of allowance for credit loss on premium receivable. + 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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