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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.