v3.26.1
Investments - Schedule of Allowance for Credit Losses Related to Fixed Maturity Securities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Fixed maturity securities:        
Beginning balance $ 23 $ 14 $ 23 $ 10
Increase from securities without allowance in previous periods 0 16 0 19
Increase (decrease) from securities with allowance in previous periods (1) 0 2 1
Securities sold 0 (4) (3) (4)
Decrease due to change in intent or requirement to sell 0 (1) 0 (1)
Write-offs 0 0 0 0
Recoveries 0 0 0 0
Ending balance 22 25 22 25
Non-U.S. government        
Fixed maturity securities:        
Beginning balance 6   2  
Increase from securities without allowance in previous periods 0   0  
Increase (decrease) from securities with allowance in previous periods 0   4  
Securities sold 0   0  
Decrease due to change in intent or requirement to sell 0   0  
Write-offs 0   0  
Recoveries 0   0  
Ending balance 6   6  
U.S. corporate        
Fixed maturity securities:        
Beginning balance 10 6 8 4
Increase from securities without allowance in previous periods 0 8 0 10
Increase (decrease) from securities with allowance in previous periods 1 0 3 0
Securities sold 0 (4) 0 (4)
Decrease due to change in intent or requirement to sell 0 0 0 0
Write-offs 0 0 0 0
Recoveries 0 0 0 0
Ending balance 11 10 11 10
Non-U.S. corporate        
Fixed maturity securities:        
Beginning balance 4 4 9 3
Increase from securities without allowance in previous periods 0 7 0 8
Increase (decrease) from securities with allowance in previous periods (2) 0 (4) 0
Securities sold 0 0 (3) 0
Decrease due to change in intent or requirement to sell 0 (1) 0 (1)
Write-offs 0 0 0 0
Recoveries 0 0 0 0
Ending balance 2 10 2 10
Commercial mortgage-backed        
Fixed maturity securities:        
Beginning balance 3 4 4 3
Increase from securities without allowance in previous periods 0 1 0 1
Increase (decrease) from securities with allowance in previous periods 0 0 (1) 1
Securities sold 0 0 0 0
Decrease due to change in intent or requirement to sell 0 0 0 0
Write-offs 0 0 0 0
Recoveries 0 0 0 0
Ending balance $ 3 $ 5 $ 3 $ 5