v3.26.1
Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Net income for period $ 208 $ 154 $ 211 $ (49)        
Decrease in investments (95,451)   (95,451)     $ (90,516)    
Decrease in equity securities, at fair value (595)   (595)     (1,179)    
Investment funds 3,605   3,605     3,187    
Other invested assets 2,203   2,203     1,485    
Deferred tax asset 435   435     460    
Decrease in total equity impacted in accumulated paid-in capital (8,669) $ (10,217) (8,669) $ (10,217) $ (9,396) (9,669) $ (10,045) $ (10,028)
Decrease in additional paid-in capital (5,865)   (5,865)     (6,404)    
Retained earnings 1,955   1,955     1,759    
Accumulated other comprehensive income, net of taxes 433   433     $ 1,094    
Revision of Prior Period, Adjustment                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Net income for period 22              
Decrease in investments 101   101          
Decrease in equity securities, at fair value 540   540          
Other invested assets 439   439          
Deferred tax asset 21   21          
Decrease in total equity impacted in accumulated paid-in capital 80   80          
Decrease in additional paid-in capital 107   107          
Retained earnings 22   22          
Accumulated other comprehensive income, net of taxes $ 5   $ 5