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Benefit Plans and Other Postretirement Benefits, Expected long-term rate of return (Details) - Pension Benefits - United States	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure
Historical compounded return on plan assets (as a percent)	8.50%
Expected long-term return on assets (as a percent)	7.75%	7.75%	7.75%
Equity securities
Defined Benefit Plan Disclosure
Target allocation (as a percent)	60.00%
Plan asset allocations, assumptions (as a percent)	60.00%
Equity securities | Minimum
Defined Benefit Plan Disclosure
Expected long-term return on assets (as a percent)	8.00%
Equity securities | Maximum
Defined Benefit Plan Disclosure
Expected long-term return on assets (as a percent)	9.00%
Fixed income securities
Defined Benefit Plan Disclosure
Target allocation (as a percent)	40.00%
Plan asset allocations, assumptions (as a percent)	40.00%
Fixed income securities | Minimum
Defined Benefit Plan Disclosure
Expected long-term return on assets (as a percent)	5.00%
Fixed income securities | Maximum
Defined Benefit Plan Disclosure
Expected long-term return on assets (as a percent)	6.00%

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- Definition

Represents the historical rate of compounded return on pension plan assets.

+ References

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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- 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/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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Percentage of actual 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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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