v3.26.1
Investments - Schedule of Allowance for Credit Losses Related to Fixed Maturity Securities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Fixed maturity securities:    
Beginning balance $ 23 $ 10
Increase from securities without allowance in previous periods 0 3
Increase (decrease) from securities with allowance in previous periods 3 1
Securities sold (3) 0
Decrease due to change in intent or requirement to sell 0 0
Write-offs 0 0
Recoveries 0 0
Ending balance 23 14
Non-U.S. government    
Fixed maturity securities:    
Beginning balance 2  
Increase from securities without allowance in previous periods 0  
Increase (decrease) from securities with allowance in previous periods 4  
Securities sold 0  
Decrease due to change in intent or requirement to sell 0  
Write-offs 0  
Recoveries 0  
Ending balance 6  
U.S. corporate    
Fixed maturity securities:    
Beginning balance 8 4
Increase from securities without allowance in previous periods 0 2
Increase (decrease) from securities with allowance in previous periods 2 0
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 10 6
Non-U.S. corporate    
Fixed maturity securities:    
Beginning balance 9 3
Increase from securities without allowance in previous periods 0 1
Increase (decrease) from securities with allowance in previous periods (2) 0
Securities sold (3) 0
Decrease due to change in intent or requirement to sell 0 0
Write-offs 0 0
Recoveries 0 0
Ending balance 4 4
Commercial mortgage-backed    
Fixed maturity securities:    
Beginning balance 4 3
Increase from securities without allowance in previous periods 0 0
Increase (decrease) from securities with allowance in previous periods (1) 1
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 $ 3 $ 4