v3.24.2.u1
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]    
Total fixed maturity securities [1] $ 5,043 $ 4,578
Equity securities [1] 73 63
Total    
Debt and Equity Securities, FV-NI [Line Items]    
Total $ 5,116 $ 4,641
Total | 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]    
Total fixed maturity securities $ 5,043 $ 4,578
Fixed maturity securities | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk (as a percent) 99.00% 99.00%
Fixed maturity securities | Obligations of states, municipalities and political subdivisions    
Debt and Equity Securities, FV-NI [Line Items]    
Total fixed maturity securities $ 39 $ 40
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% 1.00%
Fixed maturity securities | Non-U.S. governments    
Debt and Equity Securities, FV-NI [Line Items]    
Total fixed maturity securities $ 27 $ 13
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% 0.00%
Fixed maturity securities | Corporate debt    
Debt and Equity Securities, FV-NI [Line Items]    
Total fixed maturity securities $ 2,833 $ 2,653
Fixed maturity securities | Corporate debt | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk (as a percent) 55.00% 57.00%
Fixed maturity securities | Mortgage-backed, asset-backed and collateralized    
Debt and Equity Securities, FV-NI [Line Items]    
Total fixed maturity securities $ 2,144 $ 1,872
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) 42.00% 41.00%
Fixed maturity securities | RMBS    
Debt and Equity Securities, FV-NI [Line Items]    
Total fixed maturity securities $ 163 $ 170
Fixed maturity securities | RMBS | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk (as a percent) 3.00% 4.00%
Fixed maturity securities | CMBS    
Debt and Equity Securities, FV-NI [Line Items]    
Total fixed maturity securities $ 238 $ 228
Fixed maturity securities | CMBS | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk (as a percent) 5.00% 5.00%
Fixed maturity securities | CLO    
Debt and Equity Securities, FV-NI [Line Items]    
Total fixed maturity securities $ 464 $ 423
Fixed maturity securities | CLO | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk (as a percent) 9.00% 9.00%
Fixed maturity securities | ABS    
Debt and Equity Securities, FV-NI [Line Items]    
Total fixed maturity securities $ 1,279 $ 1,051
Fixed maturity securities | ABS | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk (as a percent) 25.00% 23.00%
Equity securities    
Debt and Equity Securities, FV-NI [Line Items]    
Equity securities $ 73 $ 63
Equity securities | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk (as a percent) 1.00% 1.00%
[1] See Note 8 for details of balances associated with variable interest entities