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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
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]    
Other bond securities [1] $ 5,403 $ 5,241
Equity securities [1] 797 728
Fixed Maturities And Equity Securities    
Debt and Equity Securities, FV-NI [Line Items]    
Total $ 6,200 $ 5,969
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 $ 5,403 $ 5,241
Fixed maturity securities | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk (as a percent) 87.00% 88.00%
Fixed maturity securities | Obligations of states, municipalities and political subdivisions    
Debt and Equity Securities, FV-NI [Line Items]    
Other bond securities $ 90 $ 91
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) 1.00% 2.00%
Fixed maturity securities | Non-U.S. governments    
Debt and Equity Securities, FV-NI [Line Items]    
Other bond securities $ 39 $ 37
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% 1.00%
Fixed maturity securities | Corporate debt    
Debt and Equity Securities, FV-NI [Line Items]    
Other bond securities $ 2,997 $ 2,908
Fixed maturity securities | Corporate debt | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk (as a percent) 48.00% 49.00%
Fixed maturity securities | Mortgage-backed, asset-backed and collateralized    
Debt and Equity Securities, FV-NI [Line Items]    
Other bond securities $ 2,277 $ 2,205
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) 37.00% 36.00%
Fixed maturity securities | RMBS    
Debt and Equity Securities, FV-NI [Line Items]    
Other bond securities $ 273 $ 263
Fixed maturity securities | RMBS | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk (as a percent) 4.00% 4.00%
Fixed maturity securities | CMBS    
Debt and Equity Securities, FV-NI [Line Items]    
Other bond securities $ 283 $ 261
Fixed maturity securities | CMBS | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk (as a percent) 5.00% 4.00%
Fixed maturity securities | CLO/ABS    
Debt and Equity Securities, FV-NI [Line Items]    
Other bond securities $ 1,721 $ 1,681
Fixed maturity securities | CLO/ABS | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk (as a percent) 28.00% 28.00%
Equity securities    
Debt and Equity Securities, FV-NI [Line Items]    
Equity securities $ 797 $ 728
Equity securities | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk (as a percent) 13.00% 12.00%
[1] See Note 10 for details of balances associated with variable interest entities.