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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, 2025
Dec. 31, 2024
Dec. 31, 2023
Immediate annuities      
Deferred Profit Liability Rollforward      
Balance, beginning of year $ 90 $ 87  
Effect of changes in cash flow assumptions   0 $ 0
Effect of actual variances from expected experience   0 8
Balance adjusted for variances from expectation   90 95
Issuances 6 3  
Interest accrual 1 1  
Amortization (5) (9)  
Balance, end of period 92 90  
Effect of changes in cash flow assumptions   0 0
Effect of actual variances from expected experience   0 8
PRT      
Deferred Profit Liability Rollforward      
Balance, beginning of year 6 10  
Effect of changes in cash flow assumptions   0 (8)
Effect of actual variances from expected experience   1 0
Balance adjusted for variances from expectation   7 2
Issuances 0 1  
Interest accrual 0 4  
Amortization (1) (1)  
Balance, end of period $ 6 6  
Effect of changes in cash flow assumptions   0 (8)
Effect of actual variances from expected experience   $ 1 $ 0