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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%

X

- Definition

Short-Duration Contracts, Undiscounted Liabilities, Amount

+ References

No definition available.

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The carrying amount as of the balance sheet date of loss reserves carried at present value.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
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- Definition

Discount rate used to obtain present value of liability for unpaid claim and claim adjustment expense for short-duration contract issued by insurance entity.

+ References

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-Publisher FASB
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Amount of cumulative discount related to the time value of money deducted from short-duration insurance contract liabilities that are reported at present value.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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