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Policyholder Account Balances, Future Policy Benefits and Claims - Amounts Recognized in Statement of Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums $ 153 $ 696
Interest Expense 97 389
Life Contingent Payout Annuities    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 40 226
Interest Expense 14 55
Term and Whole Life Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 43 172
Interest Expense 10 35
Disability Income Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 28 119
Interest Expense 7 31
Long Term Care Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 42 179
Interest Expense $ 66 $ 268