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Reinsurance - Reinsurance Recoverable, ACL (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | $ 55 |  | $ 48
Reinsurance Recoverable, Credit Loss Expense (Reversal) | 4 |  |
Reinsurance Recoverable, Allowance for Credit Loss, Recovery | 1 |  |
Corporate |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 2 |  | 0
Reinsurance Recoverable, Credit Loss Expense (Reversal) | 1 |  |
Reinsurance Recoverable, Allowance for Credit Loss, Recovery | 0 |  |
Operating Segments | Property and Casualty Insurance Subsidiaries |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 52 |  | 48
Reinsurance Recoverable, Credit Loss Expense (Reversal) | 3 |  |
Reinsurance Recoverable, Allowance for Credit Loss, Recovery | 1 |  |
Operating Segments | Group Insurance Policy [Member] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 1 |  | 0
Reinsurance Recoverable, Credit Loss Expense (Reversal) | 0 |  |
Reinsurance Recoverable, Allowance for Credit Loss, Recovery | 0 |  |
Uncollectible reinsurance |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 108 |  | 114
Uncollectible reinsurance | Corporate |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 2 |  | 0
Uncollectible reinsurance | Operating Segments | Property and Casualty Insurance Subsidiaries |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 105 |  | 114
Uncollectible reinsurance | Operating Segments | Group Insurance Policy [Member] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 1 |  | 0
Disputes [Member] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 53 |  | 66
Disputes [Member] | Corporate |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 0 |  | 0
Disputes [Member] | Operating Segments | Property and Casualty Insurance Subsidiaries |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 53 |  | 66
Disputes [Member] | Operating Segments | Group Insurance Policy [Member] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | $ 0 |  | 0
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 2
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Corporate |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 1
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Operating Segments | Property and Casualty Insurance Subsidiaries |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 0
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Operating Segments | Group Insurance Policy [Member] |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 1
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss |  |  | 50
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Corporate |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss |  |  | 1
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Operating Segments | Property and Casualty Insurance Subsidiaries |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss |  |  | 48
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Operating Segments | Group Insurance Policy [Member] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss |  |  | $ 1
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Uncollectible reinsurance |  |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |  |
Reinsurance Recoverable, Allowance for Credit Loss |  | $ 116 |

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- Definition Amount of increase in allowance for credit loss on reinsurance recoverable, from recovery. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on reinsurance recoverable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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