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Premiums Receivable (Notes) | 3 Months Ended
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Mar. 31, 2024
Credit Loss [Abstract] |
Premiums Receivable Note [Text Block] | 7. PREMIUMS RECEIVABLE AND AGENTS' BALANCES
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 |
ACL on Premiums Receivable and Agents' Balances Balances are considered past due when amounts that have been billed are not collected within contractually stipulated time periods. Premiums receivable and agents' balances, excluding receivables for loss sensitive business, are primarily comprised of premiums due from policyholders, which are typically collectible within one year or less. For these balances, the ACL is estimated based on an aging of receivables and recent historical credit loss and collection experience, adjusted for current economic conditions and reasonable and supportable forecasts, when appropriate. A portion of the Company's Commercial Lines business is written with large deductibles or under retrospectively-rated plans (referred to as "loss sensitive business"). Under some commercial insurance contracts with a large deductible, the Company is obligated to pay the claimant the full amount of the claim and the Company is subsequently reimbursed by the policyholder for the deductible amount. As such, the Company is subject to credit risk until reimbursement is made. Retrospectively-rated policies are utilized primarily for workers' compensation coverage, whereby the ultimate premium is adjusted based on actual losses incurred. Although the premium adjustment feature of a retrospectively-rated policy substantially reduces insurance risk for the Company, it presents credit risk to the Company. The Company’s results of operations could be adversely affected if a significant portion of such policyholders failed to reimburse the Company for the deductible amount or the amount of additional premium owed under retrospectively-rated policies. The Company manages these credit risks through credit analysis, collateral requirements, and oversight. The ACL for receivables for loss sensitive business is estimated as the amount of the receivable exposed to loss multiplied by estimated factors for probability of default and the amount of loss given a default. The probability of default is assigned based on each policyholder's credit rating, or a rating is estimated if no external rating is available. Credit ratings are reviewed and updated at least annually. The exposure amount is estimated net of collateral and other credit enhancement, considering the nature of the collateral, potential future changes in collateral values, and historical loss information for the type of collateral obtained. The probability of default factors are historical corporate defaults for receivables with similar durations estimated through multiple economic cycles. Credit ratings are forward-looking and consider a variety of economic outcomes. The loss given default factors are based on a study of historical recovery rates for general creditors through multiple economic cycles. The Company's evaluation of the required ACL for receivables for loss sensitive business considers the current economic environment as well as the probability-weighted macroeconomic scenarios similar to the approach used for estimating the ACL for mortgage loans. See Note 5 - Investments
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 The entire disclosure for premium amounts receivable by an insurance entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 310 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//944-310/tableOfContent + Details
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