v3.25.2
Investments - Fixed Maturities and Equity Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Available-for-sale Securities Including Securities Pledged [Line Items]      
Available-for-sale Securities, Pledged as Collateral, Debt Securities, Amortized Cost $ 741 $ 1,223  
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 39 30 $ 14
U.S. Treasuries      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss 478 428  
Fixed maturities, Gross Unrealized Capital Gains 0 0  
Fixed maturities, Gross Unrealized Capital Losses 45 50  
Embedded Derivatives 0 0  
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 0 0  
Debt Securities, Available-for-Sale, Excluding Accrued Interest 433 378  
US Treasury and Government      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss 29 29  
Fixed maturities, Gross Unrealized Capital Gains 0 0  
Fixed maturities, Gross Unrealized Capital Losses 1 2  
Embedded Derivatives 0 0  
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 0 0  
Debt Securities, Available-for-Sale, Excluding Accrued Interest 28 27  
State, municipalities and political subdivisions      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss 436 491  
Fixed maturities, Gross Unrealized Capital Gains 0 0  
Fixed maturities, Gross Unrealized Capital Losses 75 82  
Embedded Derivatives 0 0  
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 0 0  
Debt Securities, Available-for-Sale, Excluding Accrued Interest 361 409  
U.S. corporate public securities      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss 6,418 6,095  
Fixed maturities, Gross Unrealized Capital Gains 63 50  
Fixed maturities, Gross Unrealized Capital Losses 837 896  
Embedded Derivatives 0 0  
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 0 0  
Debt Securities, Available-for-Sale, Excluding Accrued Interest 5,644 5,249  
U.S. corporate private securities      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss 4,356 4,035  
Fixed maturities, Gross Unrealized Capital Gains 55 31  
Fixed maturities, Gross Unrealized Capital Losses 192 264  
Embedded Derivatives 0 0  
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 1 3  
Debt Securities, Available-for-Sale, Excluding Accrued Interest 4,218 3,799  
Foreign corporate public securities and foreign governments      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss 2,151 2,087  
Fixed maturities, Gross Unrealized Capital Gains 23 17  
Fixed maturities, Gross Unrealized Capital Losses 206 235  
Embedded Derivatives 0 0  
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 1 1 3
Debt Securities, Available-for-Sale, Excluding Accrued Interest 1,967 1,868  
Foreign corporate private securities      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss 2,371 2,160  
Fixed maturities, Gross Unrealized Capital Gains 40 15  
Fixed maturities, Gross Unrealized Capital Losses 56 138  
Embedded Derivatives 0 0  
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 36 8 1
Debt Securities, Available-for-Sale, Excluding Accrued Interest 2,319 2,029  
Residential mortgage-backed      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss 2,844 2,638  
Fixed maturities, Gross Unrealized Capital Gains 31 19  
Fixed maturities, Gross Unrealized Capital Losses 103 128  
Embedded Derivatives (2) (4)  
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 0 0  
Debt Securities, Available-for-Sale, Excluding Accrued Interest 2,774 2,525  
Commercial mortgage-backed      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss 2,392 2,459  
Fixed maturities, Gross Unrealized Capital Gains 3 2  
Fixed maturities, Gross Unrealized Capital Losses 283 333  
Embedded Derivatives 0 0  
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 0 17 $ 9
Debt Securities, Available-for-Sale, Excluding Accrued Interest 2,112 2,111  
Other asset-backed securities      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss 2,010 1,741  
Fixed maturities, Gross Unrealized Capital Gains 20 24  
Fixed maturities, Gross Unrealized Capital Losses 21 25  
Embedded Derivatives 0 0  
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 1 1  
Debt Securities, Available-for-Sale, Excluding Accrued Interest 2,008 1,739  
Embedded derivatives within fixed maturities      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss 23,485 22,163  
Total fixed maturities, less securities pledged, Amortized Cost 22,744 20,940  
Fixed maturities, Gross Unrealized Capital Gains 235 158  
Total fixed maturities, less securities pledged, Gross Unrealized Capital Gains 235 158  
Fixed maturities, Gross Unrealized Capital Losses 1,819 2,153  
Total fixed maturities, less securities pledged, Gross Unrealized Capital Losses 1,764 2,019  
Embedded Derivatives (2) (4)  
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 39 30  
Debt Securities, Available-for-Sale, Excluding Accrued Interest 21,864 20,134  
Total fixed maturities, less securities pledged, Fair Value 21,178 19,045  
Embedded derivatives within fixed maturities | One America      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Total fixed maturities, less securities pledged, Fair Value 1,400    
Collateral Pledged      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Securities pledged 686 1,089  
Collateral Pledged | Embedded derivatives within fixed maturities      
Available-for-sale Securities Including Securities Pledged [Line Items]      
Available-for-sale Securities, Pledged as Collateral, Debt Securities, Amortized Cost 741 1,223  
Securities pledged, Gross Unrealized Capital Gains 0 0  
Available-for-sale Securities, Pledged as Collateral, Debt Securities, Unrecognized Holding Loss 55 134  
Embedded Derivatives 0 0  
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 0 0  
Securities pledged $ 686 $ 1,089