Pension Benefits - Schedule of Allocation of Plan Assets (Details) - Pension Plan [Member]	12 Months Ended
Dec. 31, 2017
Pension Benefits
Percent of funded status policy minimum range	95.00%
Percent of funded status policy maximum range	97.50%
Long Duration Assets [Member]
Pension Benefits
Target allocation percentage of assets, range minimum	53.00%
Target allocation percentage of assets, range maximum	63.00%
Return-Seeking Assets [Member]
Pension Benefits
Target allocation percentage of assets, range minimum	37.00%
Target allocation percentage of assets, range maximum	47.00%
Return Seeking Assets, Public Equity [Member]
Pension Benefits
Asset allocation, actual	83.00%
Return Seeking Assets, Growth Fixed Income [Member]
Pension Benefits
Asset allocation, actual	6.00%
Return Seeking Assets - Alternatives [Member]
Pension Benefits
Asset allocation, actual	8.00%
Return Seeking Assets - Cash [Member]
Pension Benefits
Asset allocation, actual	3.00%
Long Duration and Return-Seeking Assets, Long Duration [Member]
Pension Benefits
Asset allocation, actual	56.00%
Long Duration and Return-Seeking Assets, Public Equity [Member]
Pension Benefits
Asset allocation, actual	36.00%
Long Duration and Return-Seeking Assets, Growth Fixed Income [Member]
Pension Benefits
Asset allocation, actual	3.00%
Long Duration and Return-Seeking Assets, Alternatives [Member]
Pension Benefits
Asset allocation, actual	4.00%
Long Duration and Return-Seeking Assets, Cash [Member]
Pension Benefits
Asset allocation, actual	1.00%
Minimum [Member] \| Return Seeking Assets, Public Equity [Member]
Pension Benefits
Asset allocation, target percentage range	70.00%
Minimum [Member] \| Return Seeking Assets, Growth Fixed Income [Member]
Pension Benefits
Asset allocation, target percentage range	0.00%
Minimum [Member] \| Return Seeking Assets - Alternatives [Member]
Pension Benefits
Asset allocation, target percentage range	0.00%
Minimum [Member] \| Return Seeking Assets - Cash [Member]
Pension Benefits
Asset allocation, target percentage range	0.00%
Minimum [Member] \| Long Duration and Return-Seeking Assets, Long Duration [Member]
Pension Benefits
Asset allocation, target percentage range	53.00%
Minimum [Member] \| Long Duration and Return-Seeking Assets, Public Equity [Member]
Pension Benefits
Asset allocation, target percentage range	26.00%
Minimum [Member] \| Long Duration and Return-Seeking Assets, Growth Fixed Income [Member]
Pension Benefits
Asset allocation, target percentage range	0.00%
Minimum [Member] \| Long Duration and Return-Seeking Assets, Alternatives [Member]
Pension Benefits
Asset allocation, target percentage range	0.00%
Minimum [Member] \| Long Duration and Return-Seeking Assets, Cash [Member]
Pension Benefits
Asset allocation, target percentage range	0.00%
Maximum [Member] \| Return Seeking Assets, Public Equity [Member]
Pension Benefits
Asset allocation, target percentage range	90.00%
Maximum [Member] \| Return Seeking Assets, Growth Fixed Income [Member]
Pension Benefits
Asset allocation, target percentage range	15.00%
Maximum [Member] \| Return Seeking Assets - Alternatives [Member]
Pension Benefits
Asset allocation, target percentage range	15.00%
Maximum [Member] \| Return Seeking Assets - Cash [Member]
Pension Benefits
Asset allocation, target percentage range	10.00%
Maximum [Member] \| Long Duration and Return-Seeking Assets, Long Duration [Member]
Pension Benefits
Asset allocation, target percentage range	63.00%
Maximum [Member] \| Long Duration and Return-Seeking Assets, Public Equity [Member]
Pension Benefits
Asset allocation, target percentage range	42.00%
Maximum [Member] \| Long Duration and Return-Seeking Assets, Growth Fixed Income [Member]
Pension Benefits
Asset allocation, target percentage range	7.00%
Maximum [Member] \| Long Duration and Return-Seeking Assets, Alternatives [Member]
Pension Benefits
Asset allocation, target percentage range	7.00%
Maximum [Member] \| Long Duration and Return-Seeking Assets, Cash [Member]
Pension Benefits
Asset allocation, target percentage range	5.00%

The target allocation percentage of total plan assets, maximum limit, per our asset allocation strategy.

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- Definition

The target allocation percentage of total plan assets, minimum limit, per our asset allocation strategy.

+ References

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- Definition

Percent of Funded Status Policy Maximum Range

+ References

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- Definition

Percent of Funded Status Policy, Minimum Range

+ References

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- Definition

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+ References

No definition available.

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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

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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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