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Liability for Future Policy Benefit (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
Net liability for future policy benefits:          
Net life policy reserves $ 3,003   $ 3,003   $ 2,960
Life policy reserves:          
Net liability for future policy benefits:          
Net life policy reserves 1,628   1,628   1,554
Term Life Insurance | Life policy reserves:          
Present value of expected net premiums:          
Balance, beginning of period 1,678 $ 1,620 1,638 $ 1,700  
Beginning balance at original discount rate 1,731 1,701 1,719 1,712  
Effect of changes in cash flow assumptions 0 (1) (4) (13)  
Effect of actual variances from expected experience (11) (4) (14) (23)  
Adjusted beginning of period balance 1,720 1,696 1,701 1,676  
Issuances 44 34 120 110  
Interest accrual 19 20 57 56  
Net premiums collected (45) (45) (140) (137)  
Ending balance at original discount rate 1,738 1,705 1,738 1,705  
Effect of changes in discount rate assumptions (27) 3 (27) 3  
Balance, end of period 1,711 1,708 1,711 1,708  
Present value of expected future policy benefits:          
Balance, beginning of period 2,720 2,634 2,668 2,751  
Beginning balance at original discount rate 2,821 2,772 2,812 2,765  
Effect of changes in cash flow assumptions 0 (1) (12) (30)  
Effect of actual variances from expected experience (16) (7) (22) (35)  
Adjusted beginning of period balance 2,805 2,764 2,778 2,700  
Issuances 44 34 120 110  
Interest accrual 32 32 96 94  
Benefits paid (37) (48) (150) (122)  
Ending balance at original discount rate 2,844 2,782 2,844 2,782  
Effect of changes in discount rate assumptions (52) 12 (52) 12  
Balance, end of period 2,792 2,794 2,792 2,794  
Net liability for future policy benefits:          
Present value of expected future policy benefits less expected net premiums 1,081 1,086 1,081 1,086  
Impact of flooring at cohort level 18 22 18 22  
Net life policy reserves 1,099 1,108 1,099 1,108 1,051
Less reinsurance recoverable at original discount rate (67) (92) (67) (92)  
Less effect of discount rate assumption changes on reinsurance recoverable (8) (10) (8) (10)  
Net life policy reserves, after reinsurance recoverable $ 1,024 $ 1,006 $ 1,024 $ 1,006  
Weighted-average duration of the net life policy reserves in years 11 years 11 years 11 years 11 years  
Whole Life Insurance | Life policy reserves:          
Present value of expected net premiums:          
Balance, beginning of period $ 220 $ 215 $ 218 $ 223  
Beginning balance at original discount rate 226 225 228 225  
Effect of changes in cash flow assumptions 0 (1) 0 0  
Effect of actual variances from expected experience 1 0 0 (3)  
Adjusted beginning of period balance 227 224 228 222  
Issuances 7 9 14 20  
Interest accrual 2 2 7 7  
Net premiums collected (8) (8) (21) (22)  
Ending balance at original discount rate 228 227 228 227  
Effect of changes in discount rate assumptions (3) 0 (3) 0  
Balance, end of period 225 227 225 227  
Present value of expected future policy benefits:          
Balance, beginning of period 634 619 623 657  
Beginning balance at original discount rate 651 636 646 628  
Effect of changes in cash flow assumptions (1) (2) (1) 0  
Effect of actual variances from expected experience 1 (1) 0 (5)  
Adjusted beginning of period balance 651 633 645 623  
Issuances 7 8 14 20  
Interest accrual 8 8 25 24  
Benefits paid (9) (8) (27) (26)  
Ending balance at original discount rate 657 641 657 641  
Effect of changes in discount rate assumptions (3) 27 (3) 27  
Balance, end of period 654 668 654 668  
Net liability for future policy benefits:          
Present value of expected future policy benefits less expected net premiums 429 441 429 441  
Impact of flooring at cohort level 1 0 1 0  
Net life policy reserves 430 441 430 441 $ 405
Less reinsurance recoverable at original discount rate (25) (25) (25) (25)  
Less effect of discount rate assumption changes on reinsurance recoverable (4) (5) (4) (5)  
Net life policy reserves, after reinsurance recoverable $ 401 $ 411 $ 401 $ 411  
Weighted-average duration of the net life policy reserves in years 15 years 16 years 15 years 16 years