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Policyholder Account Balances, Future Policy Benefits and Claims - Amounts Recognized in Statement of Operations (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums $ 349 $ 674
Interest Expense 195 388
Life Contingent Payout Annuities    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 116 196
Interest Expense 28 49
Term and Whole Life Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 86 169
Interest Expense 18 37
Disability Income Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 60 124
Interest Expense 15 32
Long Term Care Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross Premiums 87 185
Interest Expense $ 134 $ 270