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Investments - Scheduled maturities of available for sale fixed maturities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Fair Value, Fiscal Year Maturity [Abstract]    
Fair Value $ 11,397 $ 11,052
Fair Value Percent, Fiscal Year Maturity [Abstract]    
Average life of ABS 3 years 6 months  
Average life of MBS 6 years  
Fixed maturities    
Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
One year or less $ 694  
After one year through five years 2,125  
After five years through ten years 1,459  
After ten years 216  
Fixed maturities amortized cost, Subtotal 4,494  
Amortized cost 11,523  
Fair Value, Fiscal Year Maturity [Abstract]    
One year or less 687  
After one year through five years 2,123  
After five years through ten years 1,472  
After ten years 200  
Fixed maturities fair value, subtotal 4,482  
Fair Value $ 11,397 $ 11,052
Fair Value Percent, Fiscal Year Maturity [Abstract]    
One year or less 6.00%  
After one year through five years 19.00%  
After five years through ten years 13.00%  
After ten years 2.00%  
Fixed maturities fair value, subtotal, percent 40.00%  
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 $ 3,784  
Fair Value, Fiscal Year Maturity [Abstract]    
Fixed maturities without single maturity date $ 3,755  
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 $ 3,245  
Fair Value, Fiscal Year Maturity [Abstract]    
Fixed maturities without single maturity date $ 3,160  
Fair Value Percent, Fiscal Year Maturity [Abstract]    
Fixed maturities without single maturity date 27.00%