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Liability for Future Policy Benefit (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Net liability for future policy benefits:          
Net life policy reserves $ 3,069   $ 3,069   $ 3,068
Life policy reserves:          
Net liability for future policy benefits:          
Net life policy reserves 1,649   1,649   1,597
Term Life Insurance | Life policy reserves:          
Present value of expected net premiums:          
Balance, beginning of period 1,620 $ 1,664 1,700 $ 1,643  
Beginning balance at original discount rate 1,701 1,712 1,712 1,708  
Effect of changes in cash flow assumptions (1) 0 (13) (5)  
Effect of actual variances from expected experience (4) (3) (23) (15)  
Adjusted beginning of period balance 1,696 1,709 1,676 1,688  
Issuances 34 33 110 111  
Interest accrual 20 18 56 53  
Net premiums collected (45) (45) (137) (137)  
Ending balance at original discount rate 1,705 1,715 1,705 1,715  
Effect of changes in discount rate assumptions 3 (133) 3 (133)  
Balance, end of period 1,708 1,582 1,708 1,582  
Present value of expected future policy benefits:          
Balance, beginning of period 2,634 2,662 2,751 2,584  
Beginning balance at original discount rate 2,772 2,737 2,765 2,692  
Effect of changes in cash flow assumptions (1) 0 (30) 5  
Effect of actual variances from expected experience (7) (6) (35) (19)  
Adjusted beginning of period balance 2,764 2,731 2,700 2,678  
Issuances 34 33 110 111  
Interest accrual 32 30 94 90  
Benefits paid (48) (39) (122) (124)  
Ending balance at original discount rate 2,782 2,755 2,782 2,755  
Effect of changes in discount rate assumptions 12 (234) 12 (234)  
Balance, end of period 2,794 2,521 2,794 2,521  
Net liability for future policy benefits:          
Present value of expected future policy benefits less expected net premiums 1,086 939 1,086 939  
Impact of flooring at cohort level 22 17 22 17  
Net life policy reserves 1,108 956 1,108 956 1,066
Less reinsurance recoverable at original discount rate (92) (99) (92) (99)  
Less effect of discount rate assumption changes on reinsurance recoverable (10) (7) (10) (7)  
Net life policy reserves, after reinsurance recoverable $ 1,006 $ 850 $ 1,006 $ 850  
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 $ 215 $ 212 $ 223 $ 208  
Beginning balance at original discount rate 225 219 225 217  
Effect of changes in cash flow assumptions (1) (1) 0 (7)  
Effect of actual variances from expected experience 0 2 (3) 3  
Adjusted beginning of period balance 224 220 222 213  
Issuances 9 7 20 24  
Interest accrual 2 3 7 7  
Net premiums collected (8) (7) (22) (21)  
Ending balance at original discount rate 227 223 227 223  
Effect of changes in discount rate assumptions 0 (17) 0 (17)  
Balance, end of period 227 206 227 206  
Present value of expected future policy benefits:          
Balance, beginning of period 619 633 657 614  
Beginning balance at original discount rate 636 615 628 607  
Effect of changes in cash flow assumptions (2) 0 0 (10)  
Effect of actual variances from expected experience (1) 2 (5) 3  
Adjusted beginning of period balance 633 617 623 600  
Issuances 8 7 20 24  
Interest accrual 8 8 24 23  
Benefits paid (8) (9) (26) (24)  
Ending balance at original discount rate 641 623 641 623  
Effect of changes in discount rate assumptions 27 (37) 27 (37)  
Balance, end of period 668 586 668 586  
Net liability for future policy benefits:          
Present value of expected future policy benefits less expected net premiums 441 380 441 380  
Impact of flooring at cohort level 0 1 0 1  
Net life policy reserves 441 381 441 381 $ 434
Less reinsurance recoverable at original discount rate (25) (25) (25) (25)  
Less effect of discount rate assumption changes on reinsurance recoverable (5) (3) (5) (3)  
Net life policy reserves, after reinsurance recoverable $ 411 $ 353 $ 411 $ 353  
Weighted-average duration of the net life policy reserves in years 16 years 16 years 16 years 16 years