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Investments - Value of Other Securities Measured at Fair Value Based on Election of the Fair Value Option (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items] |  |
Other bond securities | $ 745 | $ 663
Equity securities | 704 | 665
Fixed Maturities And Equity Securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total | $ 1,449 | $ 1,328
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 | $ 745 | $ 663
Fixed maturity securities | Investment Concentration Risk | Investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Concentration risk (as a percent) | 51.00% | 50.00%
Fixed maturity securities | Obligations of states, municipalities and political subdivisions |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other bond securities | $ 50 | $ 51
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% | 4.00%
Fixed maturity securities | Non-U.S. governments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other bond securities | $ 24 | $ 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) | 2.00% | 2.00%
Fixed maturity securities | Corporate debt |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other bond securities | $ 282 | $ 255
Fixed maturity securities | Corporate debt | Investment Concentration Risk | Investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Concentration risk (as a percent) | 19.00% | 19.00%
Fixed maturity securities | Mortgage-backed, asset-backed and collateralized |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other bond securities | $ 389 | $ 333
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) | 27.00% | 25.00%
Fixed maturity securities | RMBS |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other bond securities | $ 100 | $ 93
Fixed maturity securities | RMBS | Investment Concentration Risk | Investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Concentration risk (as a percent) | 7.00% | 7.00%
Fixed maturity securities | CMBS |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other bond securities | $ 43 | $ 33
Fixed maturity securities | CMBS | Investment Concentration Risk | Investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Concentration risk (as a percent) | 3.00% | 2.00%
Fixed maturity securities | CLO/ABS |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Other bond securities | $ 246 | $ 207
Fixed maturity securities | CLO/ABS | Investment Concentration Risk | Investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Concentration risk (as a percent) | 17.00% | 16.00%
Equity securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity securities | $ 704 | $ 665
Equity securities | Investment Concentration Risk | Investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Concentration risk (as a percent) | 49.00% | 50.00%

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