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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

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