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Policyholder Account Balances, Future Policy Benefits and Claims - Amounts Recognized in Statement of Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums $ 696 $ 674
Interest Expense 389 388
Life contingent payout annuities    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 226 196
Interest Expense 55 49
Term and whole life insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 172 169
Interest Expense 35 37
Disability Income Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 119 124
Interest Expense 31 32
Long term care insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 179 185
Interest Expense $ 268 $ 270