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Investments - Schedule of Gross Unrealized Losses by Unrealized Loss Position and Credit Quality (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Investment grade    
Investment [Line Items]    
Fixed income securities with unrealized loss position less than 20% of amortized cost, net $ (329)  
Fixed income securities with unrealized loss position greater than or equal to 20% of amortized cost, net (23)  
Total unrealized losses (352) $ (1,128)
Below investment grade    
Investment [Line Items]    
Fixed income securities with unrealized loss position less than 20% of amortized cost, net (36)  
Fixed income securities with unrealized loss position greater than or equal to 20% of amortized cost, net (4)  
Total unrealized losses (40) (102)
Fixed income securities    
Investment [Line Items]    
Fixed income securities with unrealized loss position less than 20% of amortized cost, net (365)  
Fixed income securities with unrealized loss position greater than or equal to 20% of amortized cost, net (27)  
Total unrealized losses $ (392) $ (1,230)