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Schedule VI Supplemental Information Concerning Property and Casualty Insurance Operations Level 4 (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) |  | $ 250 | $ 228 | $ 192
Property, Liability and Casualty Insurance Product Line [Member] |  |  |  |
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items] |  |  |  |
Supplemental Information for Property, Casualty Insurance Underwriters, Discount Deducted from Reserves | [1] | $ 523 | $ 556 | $ 553
Accident and Health Insurance Product Line [Member] |  |  |  |
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items] |  |  |  |
Weighted Average Discount Rate, Percent |  | 3.24% | 3.50% | 3.50%
[1] | Reserves for permanently disabled claimants have been discounted using the weighted average interest rates of 3.24%, 3.50%, and 3.50% for the years ended December 31, 2015, 2014, and 2013, respectively.

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- Definition The amount of the other adjustment made to the claims reserves during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition The amount of discount that may be deducted from the reserve for unpaid claims and claims adjustment expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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- Definition 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. + References No definition available. + 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=6482714&loc=d3e14881-158438 + Details
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