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Employee Benefit Plans (Schedule of Allocation of Plan Assets) (Details)	Dec. 31, 2017	Dec. 31, 2016
Pension Benefit Plan [Member]
Allocation of plan assets	100.00%	100.00%
Pension Benefit Plan [Member] | Commodities [Member]
Allocation of plan assets	2.60%	2.70%
Target plan allocations	5.00%
Pension Benefit Plan [Member] | Cash [Member]
Allocation of plan assets	1.00%	1.00%
Target plan allocations	2.00%
Pension Benefit Plan [Member] | Debt Securities [Member]
Allocation of plan assets	33.60%	36.60%
Target plan allocations	38.00%
Pension Benefit Plan [Member] | Equity Securities [Member]
Allocation of plan assets	62.80%	59.70%
Target plan allocations	55.00%
Other Benefits Plan [Member]
Allocation of plan assets	100.00%	100.00%
Other Benefits Plan [Member] | Commodities [Member]
Allocation of plan assets	0.00%	0.00%
Target plan allocations	5.00%
Other Benefits Plan [Member] | Cash [Member]
Allocation of plan assets	9.40%	2.60%
Target plan allocations	2.00%
Other Benefits Plan [Member] | Debt Securities [Member]
Allocation of plan assets	32.90%	43.30%
Target plan allocations	50.00%
Other Benefits Plan [Member] | Equity Securities [Member]
Allocation of plan assets	57.70%	54.10%
Target plan allocations	43.00%

X

- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(i)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

+ Details

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X

- 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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