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Future Policy Benefits - Revenue and Interest Recognized in the Statements of Operations (Details) - USD ($)
$ in Millions
 7 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Annuities      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross Premiums or Assessments $ 18 $ 3,299 $ 1,027
Interest Expense 19 157 83
Life Insurance      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross Premiums or Assessments 265 436 452
Interest Expense $ 27 $ 78 $ 95