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Policyholder Account Balances, Future Policy Benefits and Claims - Additional Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Additional Liability, Long-Duration Insurance [Roll Forward]      
Beginning balance $ 1,321 $ 1,186  
Interest accrual 44 41  
Benefit accrual 144 138  
Benefit payments (87) (72)  
Effect of actual variances from expected experience   (4) $ (4)
Impact of change in net unrealized (gains) losses on securities (29) 32  
Ending balance 1,389 1,321  
Universal Life Insurance      
Additional Liability, Long-Duration Insurance [Roll Forward]      
Beginning balance 1,225 1,100  
Interest accrual 37 35  
Benefit accrual 133 128  
Benefit payments (69) (50)  
Effect of actual variances from expected experience   (2) (13)
Impact of change in net unrealized (gains) losses on securities (23) 25  
Ending balance $ 1,301 $ 1,225  
Weighted average interest accretion rate 3.00% 3.00%  
Weighted average discount rate 3.20% 3.20%  
Weighted average duration of reserves (in years) 10 years 10 years  
Variable Universal Life Insurance      
Additional Liability, Long-Duration Insurance [Roll Forward]      
Beginning balance $ 81 $ 74  
Interest accrual 6 5  
Benefit accrual 8 8  
Benefit payments (13) (18)  
Effect of actual variances from expected experience   (1) 11
Impact of change in net unrealized (gains) losses on securities (1) 1  
Ending balance $ 80 $ 81  
Weighted average interest accretion rate 7.00% 6.90%  
Weighted average discount rate 7.10% 7.10%  
Weighted average duration of reserves (in years) 8 years 8 years  
Other Life Insurance      
Additional Liability, Long-Duration Insurance [Roll Forward]      
Beginning balance $ 15 $ 12  
Interest accrual 1 1  
Benefit accrual 3 2  
Benefit payments (5) (4)  
Effect of actual variances from expected experience   (1) $ (2)
Impact of change in net unrealized (gains) losses on securities (5) 6  
Ending balance $ 8 $ 15  
Weighted average interest accretion rate 3.90% 4.00%  
Weighted average discount rate 4.00% 4.00%  
Weighted average duration of reserves (in years) 6 years 6 years