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Reinsurance - Allowance for Credit Loss (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | $ 105 | $ 99 | $ 108 |  | $ 114
Reinsurance Recoverable, Credit Loss Expense (Reversal) | 0 | (9) | 4 |  |
Reinsurance, Loss on Uncollectible Accounts in Period, Amount | 0 | (1) | 0 |  |
Reinsurance Recoverable, Allowance for Credit Loss, Recovery | 0 | 0 | 1 |  |
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
Reinsurance Policy, Type [Axis]: Before Uncollectible Reinsurance [Member] |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 45 | 45 | 55 |  | 48
Reinsurance Policy, Type [Axis]: Before Uncollectible Reinsurance [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss |  |  |  |  | 50
Reinsurance Policy, Type [Axis]: Disputes [Member] |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 60 | 54 | 53 |  | 114
Reinsurance Policy, Type [Axis]: Disputes [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss |  |  |  | $ 116 |
Reinsurance Policy, Type [Axis]: Disputes [Members] |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss |  | 54 | 53 |  | 66
Operating Segments | Property and Casualty Insurance Subsidiaries |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 102 | 96 | 105 |  | 114
Reinsurance Recoverable, Credit Loss Expense (Reversal) | 0 | (9) | 3 |  |
Reinsurance, Loss on Uncollectible Accounts in Period, Amount | 0 | (1) | 0 |  |
Reinsurance Recoverable, Allowance for Credit Loss, Recovery | 0 | 0 | 1 |  |
Operating Segments | Property and Casualty Insurance Subsidiaries | 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 |  |  |  |  | 0
Operating Segments | Property and Casualty Insurance Subsidiaries | Reinsurance Policy, Type [Axis]: Before Uncollectible Reinsurance [Member] |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 42 | 42 | 52 |  | 48
Operating Segments | Property and Casualty Insurance Subsidiaries | Reinsurance Policy, Type [Axis]: Before Uncollectible Reinsurance [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss |  |  |  |  | 48
Operating Segments | Property and Casualty Insurance Subsidiaries | Reinsurance Policy, Type [Axis]: Disputes [Member] |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 60 | 54 | 53 |  | 66
Operating Segments | Group Insurance Policy [Member] |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 1 | 1 | 1 |  | 0
Reinsurance Recoverable, Credit Loss Expense (Reversal) | 0 | 0 | 0 |  |
Reinsurance, Loss on Uncollectible Accounts in Period, Amount | 0 | 0 | 0 |  |
Reinsurance Recoverable, Allowance for Credit Loss, Recovery | 0 | 0 | 0 |  |
Operating Segments | Group Insurance Policy [Member] | 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 |  |  |  |  | 1
Operating Segments | Group Insurance Policy [Member] | Reinsurance Policy, Type [Axis]: Before Uncollectible Reinsurance [Member] |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 1 | 1 | 1 |  | 0
Operating Segments | Group Insurance Policy [Member] | Reinsurance Policy, Type [Axis]: Before Uncollectible Reinsurance [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss |  |  |  |  | 1
Operating Segments | Group Insurance Policy [Member] | Reinsurance Policy, Type [Axis]: Disputes [Member] |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 0 | 0 | 0 |  |
Operating Segments | Group Insurance Policy [Member] | Reinsurance Policy, Type [Axis]: Disputes [Members] |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss |  | 0 | 0 |  | 0
Corporate |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 2 | 2 | 2 |  | 0
Reinsurance Recoverable, Credit Loss Expense (Reversal) | 0 | 0 | 1 |  |
Reinsurance, Loss on Uncollectible Accounts in Period, Amount | 0 | 0 | 0 |  |
Reinsurance Recoverable, Allowance for Credit Loss, Recovery | 0 | 0 | 0 |  |
Corporate | 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 |  |  |  |  | 1
Corporate | Reinsurance Policy, Type [Axis]: Before Uncollectible Reinsurance [Member] |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 2 | 2 | 2 |  | 0
Corporate | Reinsurance Policy, Type [Axis]: Before Uncollectible Reinsurance [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss |  |  |  |  | 1
Corporate | Reinsurance Policy, Type [Axis]: Disputes [Member] |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | $ 0 | 0 | 0 |  |
Corporate | Reinsurance Policy, Type [Axis]: Disputes [Members] |  |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss |  | $ 0 | $ 0 |  | $ 0

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- Definition Amount of the write-down or write-off of a receivable from a reinsurer. + 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 (d) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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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 https://asc.fasb.org/extlink&oid=124255953&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 https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition Amount of allowance for 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 (a) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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