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Future Policy Benefits - Schedule of Reconciliation of Net FPB to the Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | $ 9,065 | $ 8,749 |
Traditional Life |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | 1,310 | 1,302 |
Immediate annuities |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | 1,297 | 1,297 |
Deferred profit liability | 91 | 90 | $ 87
PRT |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future policy benefits | 6,360 | 6,054 |
Immediate annuities DPL |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Deferred profit liability | 91 | 90 |
PRT DPL |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Deferred profit liability | $ 7 | $ 6 |

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