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Policyholder Account Balances, Future Policy Benefits and Claims - Additional Liabilities (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Additional Liability, Long-Duration Insurance [Roll Forward]    
Beginning balance $ 1,389 $ 1,321
Interest accrual 34 44
Benefit accrual 111 144
Benefit payments (79) (87)
Effect of actual variances from expected experience 10 (4)
Impact of change in net unrealized (gains) losses on securities 16 (29)
Ending balance 1,481 1,389
Universal Life Insurance    
Additional Liability, Long-Duration Insurance [Roll Forward]    
Beginning balance 1,301 1,225
Interest accrual 30 37
Benefit accrual 100 133
Benefit payments (65) (69)
Effect of actual variances from expected experience 10 (2)
Impact of change in net unrealized (gains) losses on securities 13 (23)
Ending balance $ 1,389 $ 1,301
Weighted average interest accretion rate 2.90% 3.00%
Weighted average discount rate 3.10% 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 4 6
Benefit accrual 8 8
Benefit payments (11) (13)
Effect of actual variances from expected experience (2) (1)
Impact of change in net unrealized (gains) losses on securities 0 (1)
Ending balance $ 79 $ 80
Weighted average interest accretion rate 6.90% 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 3 3
Benefit payments (3) (5)
Effect of actual variances from expected experience 2 (1)
Impact of change in net unrealized (gains) losses on securities 3 (5)
Ending balance $ 13 $ 8
Weighted average interest accretion rate 3.60% 3.90%
Weighted average discount rate 3.90% 4.00%
Weighted average duration of reserves (in years) 7 years 6 years