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v3.25.3

Investments - Value of Other Securities Measured at Fair Value Based on Election of the Fair Value Option (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items] |  |
Other bond securities | $ 743 | $ 745
Equity securities | 829 | 704
Fixed Maturities And Equity Securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total | $ 1,572 | $ 1,449
Fixed Maturities And Equity Securities | Investment Concentration Risk | Investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Concentration risk (as a percent) | 100.00% | 100.00%
Fixed maturity securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other bond securities | $ 743 | $ 745
Fixed maturity securities | Investment Concentration Risk | Investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Concentration risk (as a percent) | 46.00% | 51.00%
Fixed maturity securities | Obligations of states, municipalities and political subdivisions |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other bond securities | $ 51 | $ 50
Fixed maturity securities | Obligations of states, municipalities and political subdivisions | Investment Concentration Risk | Investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Concentration risk (as a percent) | 3.00% | 3.00%
Fixed maturity securities | Non-U.S. governments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other bond securities | $ 22 | $ 24
Fixed maturity securities | Non-U.S. governments | Investment Concentration Risk | Investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Concentration risk (as a percent) | 1.00% | 2.00%
Fixed maturity securities | Corporate debt |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other bond securities | $ 258 | $ 282
Fixed maturity securities | Corporate debt | Investment Concentration Risk | Investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Concentration risk (as a percent) | 16.00% | 19.00%
Fixed maturity securities | Mortgage-backed, asset-backed and collateralized |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other bond securities | $ 412 | $ 389
Fixed maturity securities | Mortgage-backed, asset-backed and collateralized | Investment Concentration Risk | Investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Concentration risk (as a percent) | 26.00% | 27.00%
Fixed maturity securities | RMBS |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other bond securities | $ 99 | $ 100
Fixed maturity securities | RMBS | Investment Concentration Risk | Investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Concentration risk (as a percent) | 6.00% | 7.00%
Fixed maturity securities | CMBS |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other bond securities | $ 42 | $ 43
Fixed maturity securities | CMBS | Investment Concentration Risk | Investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Concentration risk (as a percent) | 3.00% | 3.00%
Fixed maturity securities | CLO/ABS |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other bond securities | $ 271 | $ 246
Fixed maturity securities | CLO/ABS | Investment Concentration Risk | Investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Concentration risk (as a percent) | 17.00% | 17.00%
Equity securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity securities | $ 829 | $ 704
Equity securities | Investment Concentration Risk | Investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Concentration risk (as a percent) | 54.00% | 49.00%

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