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Reinsurance (Funds Withheld) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Reinsurance Funds Withheld Assets [Line Items] |  |
Funds withheld at interest | $ 8,268 | $ 5,436
Fixed Maturities [Member] |  |
Reinsurance Funds Withheld Assets [Line Items] |  |
Funds withheld at interest | 2,930 | 2,615
Equity securities |  |
Reinsurance Funds Withheld Assets [Line Items] |  |
Funds withheld at interest | 2 | 2
Mortgage Loans on Real Estate [Member] |  |
Reinsurance Funds Withheld Assets [Line Items] |  |
Funds withheld at interest | 549 | 451
Funds withheld at interest |  |
Reinsurance Funds Withheld Assets [Line Items] |  |
Funds withheld at interest | 1,401 | 1,466
Partnership |  |
Reinsurance Funds Withheld Assets [Line Items] |  |
Funds withheld at interest | 52 | 54
Short-term Investments [Member] |  |
Reinsurance Funds Withheld Assets [Line Items] |  |
Funds withheld at interest | 67 | 89
Accrued Income Receivable |  |
Reinsurance Funds Withheld Assets [Line Items] |  |
Funds withheld at interest | 37 | 31
Other Assets |  |
Reinsurance Funds Withheld Assets [Line Items] |  |
Funds withheld at interest | 1 | 0
Assets |  |
Reinsurance Funds Withheld Assets [Line Items] |  |
Funds withheld at interest | $ 5,039 | $ 4,708

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- Definition Reinsurance Funds Withheld Assets [Line Items] + References No definition available. + Details
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- Definition Amount of the reinsurer's funds held on its behalf by the ceding insurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(10)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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