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Employee Benefit Plans Employee Benefit Plans 6 (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits
Actual and Target Asset Allocations
Actual asset allocations	100.00%	100.00%
Target asset allocations	100.00%
Pension Benefits | Equity securities
Actual and Target Asset Allocations
Actual asset allocations	57.00%	55.00%
Target asset allocations	60.00%
Pension Benefits | Debt securities
Actual and Target Asset Allocations
Actual asset allocations	38.00%	40.00%
Target asset allocations	40.00%
Pension Benefits | Real Estate Funds
Actual and Target Asset Allocations
Actual asset allocations	5.00%	5.00%
Pension Benefits | Cash equivalents
Actual and Target Asset Allocations
Actual asset allocations	0.00%	0.00%
Post-Retirement Medical Benefits
Actual and Target Asset Allocations
Actual asset allocations	100.00%	100.00%
Target asset allocations	100.00%
Post-Retirement Medical Benefits | Equity securities
Actual and Target Asset Allocations
Actual asset allocations	58.00%	60.00%
Target asset allocations	60.00%
Post-Retirement Medical Benefits | Debt securities
Actual and Target Asset Allocations
Actual asset allocations	39.00%	38.00%
Target asset allocations	40.00%
Post-Retirement Medical Benefits | Real Estate Funds
Actual and Target Asset Allocations
Actual asset allocations	0.00%	0.00%
Post-Retirement Medical Benefits | Cash equivalents
Actual and Target Asset Allocations
Actual asset allocations	3.00%	2.00%

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- References

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- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ 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)(i)
-URI http://asc.fasb.org/extlink&oid=58740216&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)(i)
-URI http://asc.fasb.org/extlink&oid=58740216&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=58740216&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=58740216&loc=d3e1928-114920

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