v3.8.0.1

Employee Benefit Plans (Summary of Pension and Postretirement Plan Asset Allocation) (Details)	Dec. 31, 2017	Dec. 31, 2016
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

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+ References

No definition available.

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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

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