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Reinsurance (Tables) | 3 Months Ended
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Mar. 31, 2021
Reinsurance Disclosures [Abstract] |
Reinsurance Recoverable, Credit Quality Indicator [Table Text Block] |
Reinsurance Recoverables by Credit Quality Indicator
| As of March 31, 2021 |  | As of December 31, 2020
| Property and Casualty | Group Benefits | Corporate | Total |  | Property and Casualty | Group Benefits | Corporate | Total
A.M. Best Financial Strength Rating |  |  |  |  |  |  |  |  |
A++ | $ | 1,627 |  | $ | — |  | $ | — |  | $ | 1,627 |  |  | $ | 1,598 |  | $ | — |  | $ | — |  | $ | 1,598 |
A+ | 1,823 |  | 240 |  | 306 |  | 2,369 |  |  | 1,788 |  | 230 |  | 305 |  | 2,323 |
A | 565 |  | — |  | — |  | 565 |  |  | 638 |  | — |  | — |  | 638 |
A- | 36 |  | 9 |  | — |  | 45 |  |  | 37 |  | 9 |  | — |  | 46 |
B++ | 658 |  | — |  | 3 |  | 661 |  |  | 666 |  | — |  | 3 |  | 669 |
Below B++ | 21 |  | 1 |  | — |  | 22 |  |  | 21 |  | 1 |  | — |  | 22 |
Total Rated by A.M. Best | 4,730 |  | 250 |  | 309 |  | 5,289 |  |  | 4,748 |  | 240 |  | 308 |  | 5,296 |
Mandatory (Assigned) and Voluntary Risk Pools | 259 |  | — |  | — |  | 259 |  |  | 259 |  | — |  | — |  | 259 |
Captives | 308 |  | — |  | — |  | 308 |  |  | 305 |  | — |  | — |  | 305 |
Other not rated companies | 318 |  | 7 |  | — |  | 325 |  |  | 254 |  | 5 |  | — |  | 259 |
Gross Reinsurance Recoverables | 5,615 |  | 257 |  | 309 |  | 6,181 |  |  | 5,566 |  | 245 |  | 308 |  | 6,119 |
Allowance for uncollectible reinsurance | (95) |  | (1) |  | (2) |  | (98) |  |  | (105) |  | (1) |  | (2) |  | (108) |
Net Reinsurance Recoverables | $ | 5,520 |  | $ | 256 |  | $ | 307 |  | $ | 6,083 |  |  | $ | 5,461 |  | $ | 244 |  | $ | 306 |  | $ | 6,011 |
Reinsurance Recoverable, Allowance for Credit Loss [Table Text Block] |
Allowance for Uncollectible Reinsurance
| Three Months Ended March 31, 2021 |  | Three Months Ended March 31, 2020 |  |
| Property and Casualty | Group Benefits | Corporate | Total |  | Property and Casualty | Group Benefits | Corporate | Total |  |  |  |  |
Beginning allowance for uncollectible reinsurance | $ | 105 |  | $ | 1 |  | $ | 2 |  | $ | 108 |  |  | $ | 114 |  | $ | — |  | $ | — |  | $ | 114 |  |  |  |  |  |
Beginning allowance for disputed amounts | 53 |  | — |  | — |  | 53 |  |  | 66 |  | — |  | — |  | $ | 66 |  |  |  |  |  |
Beginning ACL | 52 |  | 1 |  | 2 |  | 55 |  |  | 48 |  | — |  | — |  | 48 |  |  |  |  |  |
Cumulative effect of accounting change [1] |  |  |  |  |  | — |  | 1 |  | 1 |  | 2 |  |  |  |  |  |
Adjusted beginning ACL | 52 |  | 1 |  | 2 |  | 55 |  |  | 48 |  | 1 |  | 1 |  | 50 |  |  |  |  |  |
Current period provision (release) | (13) |  | — |  | — |  | (13) |  |  | 1 |  | — |  | 1 |  | 2 |  |  |  |  |  |
Ending ACL | 39 |  | 1 |  | 2 |  | 42 |  |  | 49 |  | 1 |  | 2 |  | 52 |  |  |  |  |  |
Ending allowance for disputed amounts | 56 |  | — |  | — |  | 56 |  |  | 65 |  | — |  | — |  | 65 |  |  |  |  |  |
Ending allowance for uncollectible reinsurance | $ | 95 |  | $ | 1 |  | $ | 2 |  | $ | 98 |  |  | $ | 114 |  | $ | 1 |  | $ | 2 |  | $ | 117 |  |  |  |  |  |
[1] Represents the adjustment to the ACL recorded on adoption of accounting guidance for credit losses on January 1, 2020. 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 reinsurance recoverable. + 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=121599337&loc=SL82919249-210447 + Details
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- Definition Tabular disclosure of credit quality indicator for reinsurance recoverable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447 + Details
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