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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Property, Liability and Casualty Insurance Product Line [Member] |  |  |
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items] |  |  |
Short-duration Insurance Contracts, Discounted Liabilities, Aggregate Discount | $ 483 | $ 523 | $ 556
Losses and Loss Adjustment Expenses Incurred Related to: Current Year | 6,990 | 6,647 | 6,572
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 457 | 250 | 228
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid | $ 6,968 | $ 6,719 | $ 6,711
Weighted Average Discount Rate, Percent |  | 3.24% | 3.50%
Accident and Health Insurance Product Line [Member] |  |  |
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items] |  |  |
Weighted Average Discount Rate, Percent | 3.11% | 3.24% | 3.50%
Accident and Health Insurance Product Line [Member] | Property, Liability and Casualty Insurance Product Line [Member] |  |  |
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items] |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | $ (119) | $ (37) | $ (7)

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- Definition Amount, after effects of reinsurance, of increase (decrease) in the liability 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 40 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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- Definition Amount, after effects of reinsurance, of payments to settle insured claims and pay costs incurred in the claims settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + 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 Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: 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=65670685&loc=d3e14881-158438 + Details
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