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Investments - Available for sale fixed maturities (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost $ 11,549 $ 11,101    
Allowance for Expected Credit Losses 26 21 $ 41 $ 34
Fair Value 11,397 11,052    
Total fixed maturities        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 11,549 11,101    
Allowance for Expected Credit Losses 26 21    
Gross unrealized, gains 112 165    
Gross unrealized, losses (238) (193)    
Net Unrealized (126) (28)    
Fair Value 11,397 11,052    
U.S. government and government agencies        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 150 160    
Allowance for Expected Credit Losses 0 0    
Gross unrealized, gains 1 1    
Gross unrealized, losses (1) 0    
Net Unrealized 0 1    
Fair Value 150 161    
States, municipalities and political subdivisions        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 820 853    
Allowance for Expected Credit Losses 0 0    
Gross unrealized, gains 6 8    
Gross unrealized, losses (35) (26)    
Net Unrealized (29) (18)    
Fair Value 791 835    
Foreign government        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 236 236    
Allowance for Expected Credit Losses 0 0    
Gross unrealized, gains 1 2    
Gross unrealized, losses 0 0    
Net Unrealized 1 2    
Fair Value 237 238    
Residential MBS        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 3,247 2,808    
Allowance for Expected Credit Losses 2 1    
Gross unrealized, gains 32 43    
Gross unrealized, losses (117) (103)    
Net Unrealized (85) (60)    
Fair Value 3,160 2,747    
Collateralized loan obligations        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 1,185 1,167    
Allowance for Expected Credit Losses 4 5    
Gross unrealized, gains 2 1    
Gross unrealized, losses (3) (3)    
Net Unrealized (1) (2)    
Fair Value 1,180 1,160    
Other asset-backed securities        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 2,608 2,539    
Allowance for Expected Credit Losses 5 5    
Gross unrealized, gains 21 29    
Gross unrealized, losses (49) (38)    
Net Unrealized (28) (9)    
Fair Value 2,575 2,525    
Corporate and other        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 3,303 3,338    
Allowance for Expected Credit Losses 15 10 $ 30 $ 23
Gross unrealized, gains 49 81    
Gross unrealized, losses (33) (23)    
Net Unrealized 16 58    
Fair Value $ 3,304 $ 3,386