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Benefit Plans - Pension plan asset weighted average asset allocation (Details) - Pension Plan | Dec. 31, 2018 | Dec. 31, 2017
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US |  |
Weighted average asset allocation |  |
Weighted average asset allocation (as a percent) | 100.00% | 100.00%
US | Equity securities |  |
Weighted average asset allocation |  |
Weighted average asset allocation (as a percent) | 19.00% | 26.00%
US | Equity securities | Minimum |  |
Plan assets |  |
Plan assets allocation percentage | 15.00% |
US | Equity securities | Maximum |  |
Plan assets |  |
Plan assets allocation percentage | 25.00% |
US | Debt securities - Fixed income |  |
Weighted average asset allocation |  |
Weighted average asset allocation (as a percent) | 80.00% | 73.00%
US | Debt securities - Fixed income | Minimum |  |
Weighted average asset allocation |  |
Weighted average asset allocation (as a percent) | 75.00% |
US | Debt securities - Fixed income | Maximum |  |
Weighted average asset allocation |  |
Weighted average asset allocation (as a percent) | 85.00% |
US | Cash and other |  |
Weighted average asset allocation |  |
Weighted average asset allocation (as a percent) | 1.00% | 1.00%
Non-US |  |
Weighted average asset allocation |  |
Weighted average asset allocation (as a percent) | 100.00% | 100.00%
Non-US | Equity securities |  |
Weighted average asset allocation |  |
Weighted average asset allocation (as a percent) | 16.00% | 39.00%
Non-US | Debt securities - Fixed income |  |
Weighted average asset allocation |  |
Weighted average asset allocation (as a percent) | 64.00% | 46.00%
Non-US | Cash and other |  |
Weighted average asset allocation |  |
Weighted average asset allocation (as a percent) | 20.00% | 15.00%

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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 + Details
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