v3.26.3
Investments - Schedule of Gross Unrealized Losses by Unrealized Loss Position and Credit Quality (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Investment grade fixed income securities    
Investments [Line Items]    
Fixed income securities with unrealized loss position less than 20% of amortized cost, net $ (2,386)  
Fixed income securities with unrealized loss position greater than or equal to 20% of amortized cost, net (57)  
Total unrealized losses (2,443) $ (352)
Below investment grade fixed income securities    
Investments [Line Items]    
Fixed income securities with unrealized loss position less than 20% of amortized cost, net (159)  
Fixed income securities with unrealized loss position greater than or equal to 20% of amortized cost, net (15)  
Total unrealized losses (174) (40)
Fixed income securities    
Investments [Line Items]    
Fixed income securities with unrealized loss position less than 20% of amortized cost, net (2,545)  
Fixed income securities with unrealized loss position greater than or equal to 20% of amortized cost, net (72)  
Total unrealized losses $ (2,617) $ (392)