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Future Policy Benefits - Revenue and Interest Recognized in the Statements of Operations (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Annuity    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums or Assessments $ 2,903 $ 1,027
Interest Expense 176 83
Life    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums or Assessments 721 452
Interest Expense $ 130 $ 95