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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
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | $ 674 | $ 530 | $ 528
Interest Expense | 388 | 390 | 398
Life contingent payout annuities |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 196 | 45 | 39
Interest Expense | 49 | 49 | 53
Term and whole life insurance |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 169 | 169 | 166
Interest Expense | 37 | 39 | 41
Disability Income Insurance |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 124 | 127 | 131
Interest Expense | 32 | 31 | 30
Long term care insurance |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 185 | 189 | 192
Interest Expense | $ 270 | $ 271 | $ 274

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