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Pensions and Other Postretirement Benefits - Pension Plan Weighted-Average Asset Allocations, By Asset Category (Details) - Pension Benefits | Dec. 31, 2021 | Dec. 31, 2020
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Defined Benefit Plan, Information about Plan Assets [Abstract] |  |
Actual plan asset allocations | 100.00% | 100.00%
Domestic equity securities |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |
Actual plan asset allocations | 52.00% | 52.00%
Debt securities |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |
Actual plan asset allocations | 24.00% | 22.00%
International equity securities |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |
Actual plan asset allocations | 23.00% | 24.00%
Cash and cash equivalents |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |
Actual plan asset allocations | 1.00% | 2.00%

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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=123447040&loc=d3e1928-114920 + Details
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