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Other Additional Liability Rollforward (Details) - Universal Life - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Additional Liability, Long-Duration Insurance      
Balance, beginning of period $ 128 $ 121 $ 133
Balance, beginning of period before shadow reserve adjustments 129 123 131
Effect of changes in cash flow assumptions (2) (6) (1)
Effect of actual variances from expected experience 3 0 6
Adjusted beginning of period balance 130 117 136
Interest accrual 4 4 4
Excess death benefits (13) (6) (18)
Attributed assessments 12 12 12
Effect of changes in interest rate assumptions (2) 2 (11)
Balance, end of period before shadow reserve adjustments 131 129 123
Shadow reserve adjustments 1 1 2
Balance, end of period 130 128 121
Less reinsurance recoverable, end of period 7 6 5
Net other additional liability, after reinsurance recoverable $ 137 $ 134 $ 126
Weighted-average duration of the other additional liability 29 years 32 years 34 years