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Pension, Other Postretirement Benefits and Savings Plans - Pension Plan Weighted Average Investment Allocation (Details) | Dec. 31, 2020 | Dec. 31, 2019
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United States |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Pension plan weighted average investment allocation | 100.00% | 100.00%
Non-U.S. |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Pension plan weighted average investment allocation | 100.00% | 100.00%
Cash and short term securities | United States |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Pension plan weighted average investment allocation | 3.00% | 2.00%
Cash and short term securities | Non-U.S. |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Pension plan weighted average investment allocation | 2.00% | 1.00%
Equity securities | United States |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Pension plan weighted average investment allocation | 4.00% | 6.00%
Equity securities | Non-U.S. |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Pension plan weighted average investment allocation | 4.00% | 3.00%
Debt securities | United States |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Pension plan weighted average investment allocation | 93.00% | 92.00%
Debt securities | Non-U.S. |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Pension plan weighted average investment allocation | 93.00% | 96.00%
Alternatives | Non-U.S. |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Pension plan weighted average investment allocation | 1.00% |

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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=118255775&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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