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Reinsurance - Reinsurance Recoverable, Allowance for Credit Loss (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | $ 75 |
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 72 | $ 100
Reinsurance Recoverable, Credit Loss Expense (Reversal) | (4) | 1
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line | Reinsurance Contract [Axis]: Before Disputed Amounts [Member] |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 24 | 43
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line | Reinsurance Contract [Axis]: Disputes [Member] |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 48 | $ 57
Operating Segments [Member] | Group Insurance Policy [Member] |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | 1 |
Corporate, Non-Segment [Member] |  |
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] |  |
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance | $ 2 |

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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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