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Future Policy Benefits - Schedule of Balances and Changes in the Deferred Profit Liability (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Immediate Annuities      
Deferred Profit Liability Rollforward [Roll Forward]      
Balance, beginning of year $ 87 $ 69  
Effect of modeling changes   0 $ 4
Effect of changes in cash flow assumptions   0 0
Effect of actual variances from expected experience   6 16
Balance adjusted for variances from expectation   93 89
Issuances 2 3  
Interest accrual 1 2  
Amortization (6) (7)  
Balance, end of period 90 87  
Effect of modeling changes   0 4
Effect of changes in cash flow assumptions   0 0
Effect of actual variances from expected experience   6 16
PRT      
Deferred Profit Liability Rollforward [Roll Forward]      
Balance, beginning of year 10 4  
Effect of modeling changes   0 0
Effect of changes in cash flow assumptions   (7) 1
Effect of actual variances from expected experience   0 5
Balance adjusted for variances from expectation   3 10
Issuances 0 0  
Interest accrual 4 1  
Amortization (1) (1)  
Balance, end of period $ 6 10  
Effect of modeling changes   0 0
Effect of changes in cash flow assumptions   (7) 1
Effect of actual variances from expected experience   $ 0 $ 5