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Premiums Receivable (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2024
Credit Loss [Abstract] |
Premium Receivable, Allowance for Credit Loss [Table Text Block] |
Premiums Receivable and Agents' Balances
| As of March 31, 2024 | As of December 31, 2023
Premiums receivable, excluding receivables for losses within a deductible and retrospectively-rated policy premiums ("loss sensitive business") | $ | 5,676 |  | $ | 5,303 |
Receivables for loss sensitive business, by credit quality: |  |
AA | 93 |  | 94 |
A | 57 |  | 54 |
BBB | 140 |  | 136 |
BB | 88 |  | 84 |
Below BB | 45 |  | 45 |
Total receivables for loss sensitive business | 423 |  | 413 |
Total Premiums Receivable and Agents' Balances, Gross | 6,099 |  | 5,716 |
ACL | (111) |  | (109) |
Total Premiums Receivable and Agents' Balances, Net of ACL | $ | 5,988 |  | $ | 5,607 |
Rollforward of ACL on Premiums Receivable and Agents' Balances for the Three Months Ended |  |  |  |
| March 31, 2024 |  | March 31, 2023 |  |
| 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 |  |  |  |  |
Current period provision | 15 |  | — |  | 15 |  |  | 12 |  | 1 |  | 13 |  |  |  |  |
Current period write-offs | (15) |  | — |  | (15) |  |  | (14) |  | — |  | (14) |  |  |  |  |
Current period recoveries | 2 |  | — |  | 2 |  |  | 3 |  | — |  | 3 |  |  |  |  |
Ending ACL | $ | 91 |  | $ | 20 |  | $ | 111 |  |  | $ | 86 |  | $ | 25 |  | $ | 111 |  |  |  |  |

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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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