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Reserve for Unpaid Losses and Loss Adjustment Expenses - Discounted Reserves, Group (Details) - Group Benefits - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Weighted Average Discount Rate [Line Items] |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts | $ 8,380 | $ 8,636 | $ 8,957
Discount | (1,353) | (1,401) | (1,505)
Carrying value of liability for unpaid losses and loss adjustment expenses | $ 7,027 | $ 7,235 | $ 7,452
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 | 3.40% | 3.40% | 3.40%

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