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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | $ 151 | $ 530 | $ 528
Interest Expense | 97 | 390 | 398
Life contingent payout annuities |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 33 | 45 | 39
Interest Expense | 12 | 49 | 53
Term and whole life insurance |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 42 | 169 | 166
Interest Expense | 10 | 39 | 41
Disability insurance |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 31 | 127 | 131
Interest Expense | 7 | 31 | 30
Long term care insurance |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross Premiums | 45 | 189 | 192
Interest Expense | $ 68 | $ 271 | $ 274

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