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Benefit Plans and Other Postretirement Benefits, Expected long-term rate of return (Details) - Pension Benefits - U.S. | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure |  |  |
Historical compounded return on plan assets (as a percent) | 8.75% |  |
Expected long-term return on assets (as a percent) | 7.75% | 7.75% | 8.00%
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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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/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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- 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 + Details
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