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Reserve for Unpaid Losses and Loss Adjustment Expenses - Discounted Reserves, Group (Details) - Group Benefits - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Weighted Average Discount Rate [Line Items] |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts | $ 8,111 | $ 8,150 | $ 8,124
Discount | (1,196) | (1,166) | (1,205)
Carrying value of liability for unpaid losses and loss adjustment expenses | $ 6,915 | $ 6,984 | $ 6,919
Minimum |  |  |
Weighted Average Discount Rate [Line Items] |  |  |
Weighted average discount rate | 2.10% | 2.10% | 2.10%
Maximum |  |  |
Weighted Average Discount Rate [Line Items] |  |  |
Weighted average discount rate | 8.00% | 8.00% | 8.00%
Weighted Average Expected Life |  |  |
Weighted Average Discount Rate [Line Items] |  |  |
Weighted average discount rate | 3.30% | 3.20% | 3.20%

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