v3.25.2
Investments - Schedule of Gross Unrealized Losses by Unrealized Loss Position and Credit Quality (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Investment grade fixed income securities    
Investments [Line Items]    
Fixed income securities with unrealized loss position less than 20% of amortized cost, net $ (477)  
Fixed income securities with unrealized loss position greater than or equal to 20% of amortized cost, net (33)  
Total unrealized losses (510) $ (1,128)
Below investment grade fixed income securities    
Investments [Line Items]    
Fixed income securities with unrealized loss position less than 20% of amortized cost, net (60)  
Fixed income securities with unrealized loss position greater than or equal to 20% of amortized cost, net (11)  
Total unrealized losses (71) (102)
Fixed income securities    
Investments [Line Items]    
Fixed income securities with unrealized loss position less than 20% of amortized cost, net (537)  
Fixed income securities with unrealized loss position greater than or equal to 20% of amortized cost, net (44)  
Total unrealized losses $ (581) $ (1,230)