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Future Policy Benefits - Revenue and Interest Recognized in the Statements of Operations (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Annuities    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums or Assessments $ 823 $ 2,903
Interest Expense 204 176
Life Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums or Assessments 305 721
Interest Expense $ 81 $ 130