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Future Policy Benefits Reserves - Balances and Changes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Present value of future net premiums            
Balance, January 1     $ 3,425 $ 3,710    
Effect of changes in discount rate     (7) (125)    
Balance, January 1, at original locked in discount rate         $ 3,418 $ 3,585
Effect of changes in cash flow assumptions         114 111
Expect of actual variances from expected experience         (2) (40)
Adjusted balance, January 1 $ 3,357 $ 3,478 3,357 3,478 3,530 3,656
Interest accrual     133 139    
Net premiums: earned during period     (306) (317)    
Balance, end of period at original locked in discount rate 3,357 3,478 3,357 3,478    
Effect of changes in discount rate 83 147 83 147    
Balance, September 30 3,440 3,625 3,440 3,625    
Present value of future benefits & expenses            
Balance, January 1     16,583 17,669    
Effect of changes in discount rate (26) 612 (26) 612 440 (578)
Balance, January 1, at original locked in discount rate     17,023 17,091    
Effect of changes in cash flow assumptions         121 126
Effect of actual variances from expected experience         50 33
Adjusted balance, January 1         17,194 $ 17,250
Interest accrual     688 693    
Benefit & expense payments     (870) (883)    
Balance, end of period at original locked in discount rate 17,012 17,060 17,012 17,060    
Balance, September 30 16,986 17,672 16,986 17,672    
Net LFPB 13,546 14,047 13,546 14,047 $ 13,158  
Re-measurement loss of insurance claims and policyholders’ benefits $ 36 $ 48 $ 59 $ 88