v3.25.4
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, 2025
Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]    
Total fixed maturity securities [1] $ 5,407 $ 5,262
Equity securities [1] 79 56
Total    
Debt and Equity Securities, FV-NI [Line Items]    
Total $ 5,486 $ 5,318
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 $ 5,407 $ 5,262
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 | U.S. government and government sponsored entities    
Debt and Equity Securities, FV-NI [Line Items]    
Total fixed maturity securities $ 192 $ 188
Fixed maturity securities | U.S. government and government sponsored entities | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk (as a percent) 4.00% 4.00%
Fixed maturity securities | Obligations of states, municipalities and political subdivisions    
Debt and Equity Securities, FV-NI [Line Items]    
Total fixed maturity securities $ 34 $ 34
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 $ 75 $ 27
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]    
Total fixed maturity securities $ 2,914 $ 2,936
Fixed maturity securities | Corporate debt | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk (as a percent) 53.00% 54.00%
Fixed maturity securities | Mortgage-backed, asset-backed and collateralized    
Debt and Equity Securities, FV-NI [Line Items]    
Total fixed maturity securities $ 2,192 $ 2,077
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) 40.00% 39.00%
Fixed maturity securities | RMBS    
Debt and Equity Securities, FV-NI [Line Items]    
Total fixed maturity securities $ 137 $ 151
Fixed maturity securities | RMBS | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk (as a percent) 2.00% 3.00%
Fixed maturity securities | CMBS    
Debt and Equity Securities, FV-NI [Line Items]    
Total fixed maturity securities $ 217 $ 220
Fixed maturity securities | CMBS | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk (as a percent) 4.00% 4.00%
Fixed maturity securities | CLO    
Debt and Equity Securities, FV-NI [Line Items]    
Total fixed maturity securities $ 585 $ 478
Fixed maturity securities | CLO | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk (as a percent) 11.00% 9.00%
Fixed maturity securities | ABS    
Debt and Equity Securities, FV-NI [Line Items]    
Total fixed maturity securities $ 1,253 $ 1,228
Fixed maturity securities | ABS | Investment Concentration Risk | Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Concentration risk (as a percent) 23.00% 23.00%
Equity securities    
Debt and Equity Securities, FV-NI [Line Items]    
Equity securities $ 79 $ 56
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