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Investments - Scheduled maturities of available for sale fixed maturities (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Fiscal Year Maturity [Abstract]    
Available for sale (AFS) fixed maturities $ 10,518 $ 10,398
Fair Value Percent, Fiscal Year Maturity [Abstract]    
Average life of ABS 3 years  
Average life of MBS 6 years  
Fixed maturities    
Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
One year or less $ 759  
After one year through five years 2,349  
After five years through ten years 1,325  
After ten years 231  
Fixed maturities amortized cost, Subtotal 4,664  
Amortized cost 10,572  
Fair Value, Fiscal Year Maturity [Abstract]    
One year or less 751  
After one year through five years 2,369  
After five years through ten years 1,364  
After ten years 220  
Fixed maturities fair value, subtotal 4,704  
Available for sale (AFS) fixed maturities $ 10,518 $ 10,398
Fair Value Percent, Fiscal Year Maturity [Abstract]    
One year or less 7.00%  
After one year through five years 23.00%  
After five years through ten years 13.00%  
After ten years 2.00%  
Fixed maturities fair value, subtotal, percent 45.00%  
Fair value, total, percent 100.00%  
Collateralized loan obligations and other asset backed securities    
Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Fixed maturities without single maturity date $ 3,521  
Fair Value, Fiscal Year Maturity [Abstract]    
Fixed maturities without single maturity date $ 3,503  
Fair Value Percent, Fiscal Year Maturity [Abstract]    
Fixed maturities without single maturity date 33.00%  
Mortgage-backed securities    
Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Fixed maturities without single maturity date $ 2,387  
Fair Value, Fiscal Year Maturity [Abstract]    
Fixed maturities without single maturity date $ 2,311  
Fair Value Percent, Fiscal Year Maturity [Abstract]    
Fixed maturities without single maturity date 22.00%