v3.26.3
Insurance - Schedule of Present Value of Expected Net Premium and Future Policy Benefits (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Term and Whole Life        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Balance at beginning of period $ 138 $ 177    
Effect of cumulative changes in discount rate assumptions (beginning of period) 3 (5) $ (3) $ (2)
Beginning balance at original discount rate 135 175    
Effect of changes in cash flow assumptions     8 (20)
Effect of actual variances from expected experience     (8) (4)
Adjusted balance at beginning of period     135 151
Interest accretion 6 6    
Net premiums collected (15) (18)    
Ending balance at original discount rate 126 139    
Effect of changes in discount rate assumptions (3) 5 3 2
Balance at ending of period 123 144    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Balance at beginning of period 329 378    
Effect of changes in discount rate assumptions 5 (13) (9) (5)
Beginning balance at original discount rate 320 373    
Effect of changes in cash flow assumptions     (4) (23)
Effect of actual variances from expected experience     (6) (5)
Adjusted balance at beginning of period     310 345
Net issuances 3 3    
Interest accretion 12 14    
Benefit payments (33) (36)    
Ending balance at original discount rate 292 326    
Effect of changes in discount rate assumptions (5) 13 9 5
Balance at ending of period 287 339    
Accidental Death and Disability Protection        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Balance at beginning of period 28 33    
Effect of cumulative changes in discount rate assumptions (beginning of period) 1 0 0 0
Beginning balance at original discount rate 28 33    
Effect of changes in cash flow assumptions     (1) 0
Effect of actual variances from expected experience     (3) 1
Adjusted balance at beginning of period     24 34
Interest accretion 1 1    
Net premiums collected (3) (3)    
Ending balance at original discount rate 22 32    
Effect of changes in discount rate assumptions (1) 0 0 0
Balance at ending of period 21 32    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Balance at beginning of period 90 96    
Effect of changes in discount rate assumptions 4 0 1 2
Beginning balance at original discount rate 91 98    
Effect of changes in cash flow assumptions     (1) 0
Effect of actual variances from expected experience     (7) 3
Adjusted balance at beginning of period     83 101
Net issuances 2 1    
Interest accretion 3 4    
Benefit payments (8) (9)    
Ending balance at original discount rate 80 97    
Effect of changes in discount rate assumptions (4) 0 $ (1) $ (2)
Balance at ending of period $ 76 $ 97