v3.8.0.1

Employee Benefit Plans (Summary of Pension and Postretirement Plan Asset Allocation) (Details) | Dec. 31, 2017 | Dec. 31, 2016
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Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of asset class to total plan assets (actual) | 100.00% | 100.00%
Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of asset class to total plan assets (actual) | 100.00% | 100.00%
Equity securities | U.S. | Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of asset class to total plan assets (actual) | 5.00% | 4.00%
Equity securities | U.S. | Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of asset class to total plan assets (actual) | 49.00% | 44.00%
Equity securities | International | Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of asset class to total plan assets (actual) | 5.00% | 4.00%
Equity securities | International | Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of asset class to total plan assets (actual) | 13.00% | 12.00%
Fixed Maturities | U.S. | Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of asset class to total plan assets (actual) | 66.00% | 68.00%
Fixed Maturities | U.S. | Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of asset class to total plan assets (actual) | 34.00% | 36.00%
Short-term investments | U.S. | Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of asset class to total plan assets (actual) | 0.00% | 0.00%
Short-term investments | U.S. | Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of asset class to total plan assets (actual) | 4.00% | 8.00%
Real Estate | U.S. | Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of asset class to total plan assets (actual) | 8.00% | 8.00%
Real Estate | U.S. | Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of asset class to total plan assets (actual) | 0.00% | 0.00%
Other | U.S. | Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of asset class to total plan assets (actual) | 16.00% | 16.00%
Other | U.S. | Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of asset class to total plan assets (actual) | 0.00% | 0.00%

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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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