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Subsequent Events (Details) - Subsequent event - USD ($) $ in Millions | Oct. 30, 2025 | Oct. 27, 2025
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Everest Group, Ltd. Renewal Rights |  |
Subsequent Event [Line Items] |  |
Consideration transferred for renewal rights |  | $ 301
Payments for reimbursable expenses for Everest |  | $ 30
Purchase price adjustment, percent of actual premiums written (as a percent) |  | 15.00%
Reimbursable purchase price, percent of gross written premiums paid and payable less than aggregate premiums (as a percent) |  | 80.00%
Reimbursable purchase price, maximum amount |  | $ 70
Transition services expense, per month amount |  | $ 10
Term of transition services payments |  | 9 months
Forecast | Convex Group Limited |  |
Subsequent Event [Line Items] |  |
Equity ownership (as a percent) | 35.00% |
Consideration for equity method ownership | $ 2,100 |
Forecast | Onex Corporation |  |
Subsequent Event [Line Items] |  |
Equity ownership (as a percent) | 9.90% |
Consideration for equity method ownership | $ 646 |
Investment intent, amount | $ 2,000 |
Equity method investment period | 3 years |

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- Definition Amount of consideration transferred in asset acquisition. Includes, but is not limited to, cash, liability incurred by acquirer, and equity interest issued by acquirer. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 55 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479908/805-50-55-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480060/805-50-25-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 30 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480027/805-50-30-1 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 30 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480027/805-50-30-2 + Details
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