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Policyholder Account Balances, Future Policy Benefits and Claims - Additional Liabilities (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Additional Liability, Long-Duration Insurance [Roll Forward]    
Beginning balance $ 1,321 $ 1,186
Interest accrual 22 41
Benefit accrual 72 138
Benefit payments (37) (72)
Effect of actual variances from expected experience (6) (4)
Impact of change in net unrealized (gains) losses on securities (21) 32
Ending balance 1,351 1,321
Universal Life Insurance    
Additional Liability, Long-Duration Insurance [Roll Forward]    
Beginning balance 1,225 1,100
Interest accrual 19 35
Benefit accrual 66 128
Benefit payments (27) (50)
Effect of actual variances from expected experience (7) (13)
Impact of change in net unrealized (gains) losses on securities (16) 25
Ending balance $ 1,260 $ 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 3 5
Benefit accrual 4 8
Benefit payments (8) (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 7.10% 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 0 1
Benefit accrual 2 2
Benefit payments (2) (4)
Effect of actual variances from expected experience 0 (2)
Impact of change in net unrealized (gains) losses on securities (4) 6
Ending balance $ 11 $ 15
Weighted average interest accretion rate 4.00% 4.00%
Weighted average discount rate 4.00% 4.00%
Weighted average duration of reserves (in years) 6 years 6 years