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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
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Weighted Average Discount Rate [Line Items] |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts | $ 9,071 | $ 6,382 | $ 6,565
Less: amount of discount | 1,536 | 1,303 | 1,382
Carrying value of liability for unpaid losses and loss adjustment expenses | $ 7,535 | $ 5,079 | $ 5,183
Weighted average discount rate | 3.50% | 4.30% | 4.40%
Minimum |  |  |
Weighted Average Discount Rate [Line Items] |  |  |
Range of discount rates | 2.10% | 3.00% | 3.00%
Maximum |  |  |
Weighted Average Discount Rate [Line Items] |  |  |
Range of discount rates | 8.00% | 8.00% | 8.00%

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670685&loc=d3e14881-158438 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.N.Q1) -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569934-122904 + Details
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- Definition Amount of cumulative discount related to the time value of money deducted from short-duration insurance contract liabilities that are reported at present value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65670685&loc=d3e14881-158438 + Details
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- Definition The average discount rate applied to insurance contracts to determine future policy benefits to be paid to or on behalf of policyholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670685&loc=d3e14881-158438 + Details
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