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Income Taxes - Reconciliation of effective tax rate by jurisdiction (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Effective Income Tax Rate Reconciliation, Amount      
Income tax provision at Bermuda statutory tax rate $ 774 $ 424 $ 300
Foreign tax effects      
Other   8 8
Other foreign taxes 7    
Effect of changes in tax laws or rates enacted in the current period (65) 12 (1,179)
Nontaxable or nondeductible items / other      
Investment income (54) (39) (14)
Other (22)    
Other 20    
Income tax expense (benefit) $ 760 $ 362 $ (873)
Effective Income Tax Rate Reconciliation, Percent      
Bermuda Federal Statutory Tax Rate 15.00%    
Foreign tax effects      
Other foreign taxes 0.10%    
Effect of changes in tax laws or rates enacted in the current period (1.30%)    
Nontaxable or nondeductible items / other      
Investment income (1.00%)    
Other (0.40%)    
Other 0.30%    
Total 14.70%    
United States      
Foreign tax effects      
Tax rate differential $ 99    
Other $ (17)    
Foreign tax effects      
Tax rate differential 1.90%    
Other (0.30%)    
Bermuda      
Foreign tax effects      
Foreign tax credits $ (56)    
Other $ 20    
Foreign tax effects      
Foreign tax credits (1.10%)    
Other 0.40%    
United Kingdom      
Foreign tax effects      
Effect of cross-border tax laws $ 45    
Other $ 9    
Foreign tax effects      
Effect of cross-border tax laws 0.90%    
Other 0.20%