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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
 3 Months Ended
Mar. 31, 2025
Mar. 31, 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 273 307
Prior years 12 72
Total incurred 285 379
Current year (25) (33)
Prior years (383) (321)
Total paid (408) (354)
Net balance at March 31 467 410
Plus: reinsurance recoverable (9) (10)
Balance at March 31 $ 476 $ 420