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Policyholder Account Balances, Future Policy Benefits and Claims - Amounts Recognized in Statement of Operations (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums $ 461 $ 696
Interest Expense 289 389
Life Contingent Payout Annuities    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 119 226
Interest Expense 43 55
Term and Whole Life Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 129 172
Interest Expense 26 35
Disability Income Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 86 119
Interest Expense 22 31
Long Term Care Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 127 179
Interest Expense $ 198 $ 268