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Premiums Receivable (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2022
Credit Loss [Abstract] |
Premium Receivable, Allowance for Credit Loss [Table Text Block] |
Premiums Receivable and Agents' Balances
| As of December 31,
| 2022 | 2021
Premiums receivable, excluding receivables for losses within a deductible and retrospectively-rated policy premiums ("loss sensitive business") | $ | 4,698 |  | $ | 4,130 |
Receivables for loss sensitive business, by credit quality: |  |
AA | 106 |  | 130 |
A | 38 |  | 52 |
BBB | 119 |  | 133 |
BB | 56 |  | 64 |
Below BB | 41 |  | 41 |
Total receivables for loss sensitive business | 360 |  | 420 |
Total Premiums Receivable and Agents' Balances, Gross | 5,058 |  | 4,550 |
ACL | (109) |  | (105) |
Total Premiums Receivable and Agents' Balances, Net of ACL | $ | 4,949 |  | $ | 4,445 |
Rollforward of ACL on Premiums Receivable and Agents' Balances for the Year Ended
| December 31, 2022 |  | December 31, 2021 |  | December 31, 2020
| Premiums Receivable and Agents' Balances, Excluding Receivables for Loss Sensitive Business | Receivables for Loss Sensitive Business | Total |  | Premiums Receivable and Agents' Balances, Excluding Receivables for Loss Sensitive Business | Receivables for Loss Sensitive Business | Total |  | Premiums Receivable and Agents' Balances, Excluding Receivables for Loss Sensitive Business | Receivables for Loss Sensitive Business | Total
Beginning ACL | $ | 83 |  | $ | 22 |  | $ | 105 |  |  | $ | 117 |  | $ | 35 |  | $ | 152 |  |  | $ | 85 |  | $ | 60 |  | $ | 145 |
Cumulative effect of accounting change [1] |  |  |  |  |  |  |  |  | (2) |  | (21) |  | (23) |
Adjusted beginning ACL | 83 |  | 22 |  | 105 |  |  | 117 |  | 35 |  | 152 |  |  | 83 |  | 39 |  | 122 |
Current period provision (release) | 48 |  | 3 |  | 51 |  |  | 17 |  | (13) |  | 4 |  |  | 78 |  | (4) |  | 74 |
Current period gross write-offs | (56) |  | (1) |  | (57) |  |  | (59) |  | — |  | (59) |  |  | (49) |  | — |  | (49) |
Current period gross recoveries | 10 |  | — |  | 10 |  |  | 8 |  | — |  | 8 |  |  | 5 |  | — |  | 5 |
Ending ACL | $ | 85 |  | $ | 24 |  | $ | 109 |  |  | $ | 83 |  | $ | 22 |  | $ | 105 |  |  | $ | 117 |  | $ | 35 |  | $ | 152 |
[1]Represents the adjustment to the ACL recorded on adoption of accounting guidance for credit losses on January 1, 2020. The adjusted beginning ACL was based on the Company's historical loss information adjusted for current conditions and the forecasted economic environment at the time the guidance was adopted. For further information refer to Note 1 - Basis of Presentation and Significant Accounting Policies.

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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