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Reserves for Future Policy Benefits and Contract Owner Account Balances - Rollforward of the Liability for Unpaid Claims and Claim Adjustment Expenses (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Balance at January 1 $ 595 $ 401
Less: Reinsurance recoverable (5) (16)
Net balance at January 1 590 385
Current year 874 1,026
Prior years 40 141
Total incurred 914 1,167
Current year (418) (515)
Prior years (560) (487)
Total paid (978) (1,002)
Net balance at end of period 526 550
Plus: Reinsurance recoverable (5) (7)
Balance as of September 30, 2025 $ 531 $ 557