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Reserve for Unpaid Losses and Loss Adjustment Expenses - Discounted Reserves, Group (Details) - Group Insurance Policies - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Weighted Average Discount Rate [Line Items]
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts	$ 8,957	$ 9,071	$ 6,382
Less: amount of discount	1,505	1,536	1,303
Carrying value of liability for unpaid losses and loss adjustment expenses	$ 7,452	$ 7,535	$ 5,079
Weighted average discount rate	3.40%	3.50%	4.30%
Minimum
Weighted Average Discount Rate [Line Items]
Range of discount rates	2.10%	2.10%	3.00%
Maximum
Weighted Average Discount Rate [Line Items]
Range of discount rates	8.00%	8.00%	8.00%

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Range of Discount Rates

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Short-Duration Contracts, Undiscounted Liabilities, Amount

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
-Section S99
-Paragraph 1
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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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-Publisher FASB
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The average discount rate applied to insurance contracts to determine future policy benefits to be paid to or on behalf of policyholders.

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