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Future Policy Benefits - Reconciliation of Net FPB to the Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | $ 7,441 | $ 7,050 |
Traditional Life |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | 1,318 | 1,349 |
Immediate Annuities |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | 1,372 | 1,415 |
Deferred profit liability | 88 | 87 | $ 69
PRT |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | 4,655 | 4,189 |
Deferred profit liability | 8 | 10 | $ 4
Immediate annuities DPL |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Deferred profit liability | 88 | 87 |
PRT DPL |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Deferred profit liability | $ 8 | $ 10 |

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