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Premiums Receivable (Tables) | 6 Months Ended
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Jun. 30, 2021
Credit Loss [Abstract] |
Premium Receivable, Allowance for Credit Loss [Table Text Block] |
Premiums Receivable and Agents' Balances
| As of June 30, 2021 | As of December 31, 2020
Premiums receivable, excluding receivables for losses within a deductible and retrospectively-rated policy premiums | $ | 4,228 |  | $ | 3,851 |
Receivables for loss within a deductible and retrospectively-rated policy premiums, by credit quality: |  |
AAA | — |  | — |
AA | 139 |  | 142 |
A | 56 |  | 62 |
BBB | 163 |  | 185 |
BB | 105 |  | 115 |
Below BB | 65 |  | 65 |
Total receivables for losses within a deductible and retrospectively-rated policy premiums | 528 |  | 569 |
Total Premiums Receivable and Agents' Balances, Gross | 4,756 |  | 4,420 |
ACL | (134) |  | (152) |
Total Premiums Receivable and Agents' Balances, Net of ACL | $ | 4,622 |  | $ | 4,268 |
Rollforward of ACL on Premiums Receivable and Agents' Balances for the Three Months Ended |  |  |  |
| June 30, 2021 |  | June 30, 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 | $ | 108 |  | $ | 36 |  | $ | 144 |  |  | $ | 98 |  | $ | 41 |  | $ | 139 |  |  |  |  |
Current period provision (release) | 1 |  | 1 |  | 2 |  |  | 48 |  | 3 |  | 51 |  |  |  |  |
Current period write-offs | (15) |  | — |  | (15) |  |  | (8) |  | — |  | (8) |  |  |  |  |
Current period recoveries | 3 |  | — |  | 3 |  |  | 1 |  | — |  | 1 |  |  |  |  |
Ending ACL | $ | 97 |  | $ | 37 |  | $ | 134 |  |  | $ | 139 |  | $ | 44 |  | $ | 183 |  |  |  |  |
Rollforward of ACL on Premiums Receivable and Agents' Balances for the Six Months Ended |  |  |  |
| June 30, 2021 |  | June 30, 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) | 5 |  | 2 |  | 7 |  |  | 76 |  | 5 |  | 81 |  |  |  |  |
Current period write-offs | (30) |  | — |  | (30) |  |  | (23) |  | — |  | (23) |  |  |  |  |
Current period recoveries | 5 |  | — |  | 5 |  |  | 3 |  | — |  | 3 |  |  |  |  |
Ending ACL | $ | 97 |  | $ | 37 |  | $ | 134 |  |  | $ | 139 |  | $ | 44 |  | $ | 183 |  |  |  |  |
[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 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 http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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