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Future Policy Benefits - Summary Balances and Changes in the Present Value of Expected Net Premiums and Present Value (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Liability for Future Policy Benefit, Expected Future Policy Benefit      
Future policy benefits $ 10,055 $ 8,749  
Traditional Life      
Liability for Future Policy Benefit, Expected Net Premium      
Balance, beginning of year 631 722  
Beginning balance at original discount rate 780 874  
Effect of actual variances from expected experience   0 $ (4)
Balance adjusted for variances from expectation   780 870
Interest accrual 11 17  
Net premiums collected (73) (107)  
Ending balance at original discount rate 718 780  
Effect of actual variances from expected experience   0 (4)
Effect of changes in discount rate assumptions (117) (149)  
Balance, end of period 601 631  
Liability for Future Policy Benefit, Expected Future Policy Benefit      
Balance, beginning of year 1,933 2,071  
Beginning balance at original discount rate 2,368 2,492  
Effect of actual variances from expected experience   (19) 44
Balance adjusted for variances from expectation   2,349 2,536
Interest accrual 38 54  
Benefits payments (173) (222)  
Ending balance at original discount rate 2,214 2,368  
Effect of actual variances from expected experience   (19) 44
Balance adjusted for variances from expectation   2,349 2,536
Interest accrual 38 54  
Benefits payments (173) (222)  
Effect of changes in discount rate assumptions (323) (435)  
Balance, end of period 1,891 1,933  
Future policy benefits 1,290 1,302  
Less: Reinsurance recoverable 486 513  
Net liability for future policy benefits, after reinsurance recoverable $ 804 $ 789  
Weighted-average duration of liability for future policyholder benefits (years) 6 years 11 months 8 days 6 years 3 months 10 days  
PRT      
Liability for Future Policy Benefit, Expected Future Policy Benefit      
Balance, beginning of year $ 6,054 $ 4,189  
Beginning balance at original discount rate 6,417 4,351  
Effect of changes in cash flow assumptions   (35) (3)
Effect of actual variances from expected experience   (2) (11)
Balance adjusted for variances from expectation   6,380 4,337
Issuances 1,359 2,324  
Interest accrual 238 240  
Benefits payments (485) (484)  
Ending balance at original discount rate 7,492 6,417  
Effect of changes in cash flow assumptions   (35) (3)
Effect of actual variances from expected experience   (2) (11)
Balance adjusted for variances from expectation   6,380 4,337
Issuances 1,359 2,324  
Interest accrual 238 240  
Benefits payments (485) (484)  
Effect of changes in discount rate assumptions (129) (363)  
Balance, end of period 7,363 6,054  
Net liability for future policy benefits, after reinsurance recoverable $ 7,363 $ 6,054  
Weighted-average duration of liability for future policyholder benefits (years) 7 years 9 months 18 days 7 years 9 months 10 days  
Immediate annuities      
Liability for Future Policy Benefit, Expected Future Policy Benefit      
Balance, beginning of year $ 1,297 $ 1,415  
Beginning balance at original discount rate 1,732 1,788  
Effect of changes in cash flow assumptions   0 0
Effect of actual variances from expected experience   (7) (27)
Balance adjusted for variances from expectation   1,725 1,761
Issuances 16 30  
Interest accrual 40 59  
Benefits payments (84) (118)  
Ending balance at original discount rate 1,697 1,732  
Effect of changes in cash flow assumptions   0 0
Effect of actual variances from expected experience   (7) (27)
Balance adjusted for variances from expectation   1,725 $ 1,761
Issuances 16 30  
Interest accrual 40 59  
Benefits payments (84) (118)  
Effect of changes in discount rate assumptions (393) (435)  
Balance, end of period 1,304 1,297  
Future policy benefits 1,304 1,297  
Less: Reinsurance recoverable 109 109  
Net liability for future policy benefits, after reinsurance recoverable $ 1,195 $ 1,188  
Weighted-average duration of liability for future policyholder benefits (years) 12 years 5 months 8 days 12 years 7 months 17 days