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Long-term Employee Benefits - Schedule of Allocation of Plan Assets (Details) - Pension Plan [Member] | 12 Months Ended |
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Dec. 31, 2018 | Dec. 31, 2017
Minimum [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocations | 15.00% | 25.00%
Target Allocation | .15 |
Minimum [Member] | Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocations | 25.00% | 20.00%
Target Allocation | .25 |
Minimum [Member] | Real Estate [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocations | 0.00% | 0.00%
Target Allocation | 0 |
Minimum [Member] | Other Assets [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocations | 45.00% | 45.00%
Target Allocation | .45 |
Maximum [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocations | 20.00% | 30.00%
Target Allocation | .20 |
Maximum [Member] | Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocations | 30.00% | 25.00%
Target Allocation | .30 |
Maximum [Member] | Real Estate [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocations | 5.00% | 5.00%
Target Allocation | .05 |
Maximum [Member] | Other Assets [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocations | 50.00% | 50.00%
Target Allocation | .50 |

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- Definition Description of investment policy and strategy for defined benefit plan asset. Includes, but is not limited to, investment allocation decision and factor pertinent to understanding investment policy and strategy for plan asset. Factor includes, but is not limited to, investment goal, risk management practice, permitted and prohibited investment including use of derivative, diversification, and relationship between plan asset and obligation. + 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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- Definition 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 + Details
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