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Reinsurance - Allowance for Credit Loss (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | $ 75 | $ 103 | $ 105 |
Operating Segments | Property and Casualty Insurance Subsidiaries |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 72 | 100 | 102 | $ 96
Reinsurance Recoverable, Credit Loss Expense (Reversal) | (6) | 3 | 0 |
Reinsurance, Loss on Uncollectible Accounts in Period, Amount | (13) | (2) | 0 |
Operating Segments | Property and Casualty Insurance Subsidiaries | Reinsurance Policy, Type [Axis]: Before Disputed Amounts [Member] |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 24 | 43 | 42 | 42
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 | 48 | 57 | 60 | $ 54
Operating Segments | Group Insurance Policy [Member] |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 1 | 1 | 1 |
Corporate |  |  |  |
Reinsurance Recoverable, Past Due [Line Items] |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | $ 2 | $ 2 | $ 2 |

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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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + 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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + 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 -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479838/944-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477409/944-310-45-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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