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Employee Benefit Plans Weighted Average Asset Allocation by Pension Plan (Details) | Dec. 31, 2017 | Dec. 31, 2016
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Foreign Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 100.00% | 100.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  | 100.00% |
Foreign Plan [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 30.00% | 27.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  | 33.00% |
Foreign Plan [Member] | Fixed Income Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 46.00% | 48.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  | 45.00% |
Foreign Plan [Member] | Balanced Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations | [1] | 24.00% | 24.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | [1] | 22.00% |
Foreign Plan [Member] | Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 0.00% | 1.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  | 0.00% |
Domestic Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 100.00% | 100.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  | 100.00% |
Domestic Plan [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 63.00% | 59.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  | 60.00% |
Domestic Plan [Member] | Fixed Income Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 36.00% | 38.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  | 36.00% |
Domestic Plan [Member] | Balanced Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations | [1] | 0.00% | 0.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | [1] | 0.00% |
Domestic Plan [Member] | Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 1.00% | 3.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  | 4.00% |
[1] | Diversified growth funds invest in a broad range of asset classes including equities, investment grade and high yield bonds, commodities, property, private equity, infrastructure and currencies.

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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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