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Pension and Other Postretirement Benefits - Schedule of Pension and Postretirement Plans Investment Policy and Weighted Average Asset Allocations (Details) | Dec. 31, 2018 | Dec. 31, 2017
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Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, asset allocations | 100.00% | 100.00%
Equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, asset allocations | 29.00% | 28.00%
Equities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Policy range | 55.00% |
Equities | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Policy range | 20.00% |
Fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, asset allocations | 48.00% | 47.00%
Fixed income | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Policy range | 55.00% |
Fixed income | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Policy range | 25.00% |
Other investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, asset allocations | 23.00% | 25.00%
Other investments | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Policy range | 35.00% |
Other investments | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Policy range | 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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