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Premiums Receivable (Notes) | 3 Months Ended
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Mar. 31, 2021
Credit Loss [Abstract] |
Premiums Receivable Note [Text Block] | 7. PREMIUMS RECEIVABLE AND AGENTS' BALANCES
Premiums Receivable and Agents' Balances
| As of March 31, 2021 | As of December 31, 2020
Premiums receivable, excluding receivables for losses within a deductible and retrospectively-rated policy premiums | $ | 4,058 |  | $ | 3,851 |
Receivables for loss within a deductible and retrospectively-rated policy premiums, by credit quality: |  |
AAA | — |  | — |
AA | 140 |  | 142 |
A | 65 |  | 62 |
BBB | 186 |  | 185 |
BB | 115 |  | 115 |
Below BB | 67 |  | 65 |
Total receivables for losses within a deductible and retrospectively-rated policy premiums | 573 |  | 569 |
Total Premiums Receivable and Agents' Balances, Gross | 4,631 |  | 4,420 |
ACL | (144) |  | (152) |
Total Premiums Receivable and Agents' Balances, Net of ACL | $ | 4,487 |  | $ | 4,268 |
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. The Company had an immaterial amount of receivables with a due date of more than one year that are past-due. Premium receivable and agents' balances, excluding receivables for losses within a deductible and retrospectively-rated policy premiums, 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. 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 within a deductible and retrospectively-rated policy premiums 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 within a deductible and retrospectively-rated policy premiums 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. During the three months ended March 31, 2021, the ACL on premiums receivable decreased as the provision required on premiums written in the quarter was more than offset by write-offs and a reduction in the provision reflecting lessening expected impacts of COVID-19 relative to prior assumptions in certain lines of business. The three months ended March 31, 2020 reflected an increase in the ACL primarily due to increasing expected impacts of COVID-19.
Rollforward of ACL on Premiums Receivable and Agents' Balances |  |  |  |
| Three Months Ended March 31, 2021 |  | Three Months Ended March 31, 2020 |  |
| Premiums Receivable and Agents' Balances, Excluding Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums | Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums | Total |  | Premiums Receivable and Agents' Balances, Excluding Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums | Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums | Total |  |  |  |
Beginning ACL | $ | 117 |  | $ | 35 |  | $ | 152 |  |  | $ | 85 |  | $ | 60 |  | $ | 145 |  |  |  |  |
Cumulative effect of accounting change [1] |  |  |  |  | (2) |  | (21) |  | (23) |  |  |  |  |
Adjusted beginning ACL | 117 |  | 35 |  | 152 |  |  | 83 |  | 39 |  | 122 |  |  |  |  |
Current period provision (release) | 4 |  | 1 |  | 5 |  |  | 28 |  | 2 |  | 30 |  |  |  |  |
Current period gross write-offs | (15) |  | — |  | (15) |  |  | (15) |  | — |  | (15) |  |  |  |  |
Current period gross recoveries | 2 |  | — |  | 2 |  |  | 2 |  | — |  | 2 |  |  |  |  |
Ending ACL | $ | 108 |  | $ | 36 |  | $ | 144 |  |  | $ | 98 |  | $ | 41 |  | $ | 139 |  |  |  |  |
[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, see Note 1 - Basis of Presentation and Significant Accounting Policies of Notes to Consolidated Financial Statements included in the Company's 2020 Form 10-K Annual Report.

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- Definition The entire disclosure for premium amounts receivable by an insurance entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -URI http://asc.fasb.org/subtopic&trid=4738109 + Details
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