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Future Policy Benefits - Revenue and Interest Recognized in the Statements of Operations (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Annuities    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums or Assessments $ 687 $ 1,555
Interest Expense 118 81
Life Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums or Assessments 206 391
Interest Expense $ 41 $ 72