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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 | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Other bond securities | [1] | $ 766 | $ 663
Equity securities | [1] | 688 | 665
Fixed Maturities And Equity Securities |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Total |  | $ 1,454 | $ 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 |  | $ 766 | $ 663
Fixed maturity securities | Investment Concentration Risk | Investments |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Concentration risk (as a percent) |  | 52.00% | 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 |  | $ 25 | $ 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 |  | $ 311 | $ 255
Fixed maturity securities | Corporate debt | Investment Concentration Risk | Investments |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Concentration risk (as a percent) |  | 21.00% | 19.00%
Fixed maturity securities | Mortgage-backed, asset-backed and collateralized |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Other bond securities |  | $ 380 | $ 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) |  | 26.00% | 25.00%
Fixed maturity securities | RMBS |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Other bond securities |  | $ 102 | $ 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 |  | $ 42 | $ 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 |  | $ 236 | $ 207
Fixed maturity securities | CLO/ABS | Investment Concentration Risk | Investments |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Concentration risk (as a percent) |  | 16.00% | 16.00%
Equity securities |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Equity securities |  | $ 688 | $ 665
Equity securities | Investment Concentration Risk | Investments |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Concentration risk (as a percent) |  | 48.00% | 50.00%
[1] | See Note 10 for details of balances associated with variable interest entities.

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