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Reserve for Unpaid Losses and Loss Adjustment Expenses - Discounted Reserves, Group (Details) - Group Benefits - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Weighted Average Discount Rate [Line Items]
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts	$ 8,150	$ 8,124	$ 8,176
Discount	(1,166)	(1,205)	(1,304)
Carrying value of liability for unpaid losses and loss adjustment expenses	$ 6,984	$ 6,919	$ 6,872
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	3.20%	3.20%	3.30%

X

- Definition

Short-Duration Contracts, Undiscounted Liabilities, Amount

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
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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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-Name Accounting Standards Codification
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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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