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Policyholder Account Balances, Future Policy Benefits and Claims - Additional Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Additional Liability, Long-Duration Insurance [Roll Forward]    
Beginning balance $ 1,389 $ 1,321
Interest accrual 11 44
Benefit accrual 36 144
Benefit payments (32) (87)
Effect of actual variances from expected experience 3 (4)
Impact of change in net unrealized (gains) losses on securities 6 (29)
Ending balance 1,413 1,389
Universal Life Insurance    
Additional Liability, Long-Duration Insurance [Roll Forward]    
Beginning balance 1,301 1,225
Interest accrual 10 37
Benefit accrual 33 133
Benefit payments (23) (69)
Effect of actual variances from expected experience 0 (2)
Impact of change in net unrealized (gains) losses on securities 5 (23)
Ending balance $ 1,326 $ 1,301
Weighted average interest accretion rate 2.90% 3.00%
Weighted average discount rate 3.20% 3.20%
Weighted average duration of reserves (in years) 9 years 10 years
Variable Universal Life Insurance    
Additional Liability, Long-Duration Insurance [Roll Forward]    
Beginning balance $ 80 $ 81
Interest accrual 1 6
Benefit accrual 2 8
Benefit payments (8) (13)
Effect of actual variances from expected experience 3 (1)
Impact of change in net unrealized (gains) losses on securities 0 (1)
Ending balance $ 78 $ 80
Weighted average interest accretion rate 7.20% 7.00%
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 $ 8 $ 15
Interest accrual 0 1
Benefit accrual 1 3
Benefit payments (1) (5)
Effect of actual variances from expected experience 0 (1)
Impact of change in net unrealized (gains) losses on securities 1 (5)
Ending balance $ 9 $ 8
Weighted average interest accretion rate 3.90% 3.90%
Weighted average discount rate 4.00% 4.00%
Weighted average duration of reserves (in years) 6 years 6 years